From 44e9072541c3c9f9c61709c8b8f7587de4035e44 Mon Sep 17 00:00:00 2001
From: Keith Packard <keithp@keithp.com>
Date: Wed, 24 Dec 2014 00:07:54 -0800
Subject: [PATCH] Add a 20V darlington source. Switch to STM32F042 (Schematic
 changes only)

This provides *both* the low current zener noise source and a new 20V
darlington noise source to see which one works better.

The low current zener source has been updated to filter the input
power and provide for both low-pass filtering and configurable gain in
both op-amp stages to allow for more experimentation.

Signed-off-by: Keith Packard <keithp@keithp.com>
---
 usbtrng.sch | 1483 +++++++++++++++++++++++++++++++--------------------
 1 file changed, 915 insertions(+), 568 deletions(-)

diff --git a/usbtrng.sch b/usbtrng.sch
index aba94e5..a4795fa 100644
--- a/usbtrng.sch
+++ b/usbtrng.sch
@@ -1,113 +1,113 @@
 v 20130925 2
-C 75300 54800 1 0 0 gnd.sym
-N 75400 55100 75400 55500 4
-T 74200 52800 9 30 1 0 0 0 1
+C 86500 69400 1 0 0 gnd.sym
+N 86600 69700 86600 70100 4
+T 86200 52800 9 30 1 0 0 0 1
 USB TRNG
 T 13300 -8600 8 10 0 1 0 0 1
 vendor_part_number=MMA7260QT-ND
 T 13300 -8600 8 10 0 1 0 0 1
 vendor_part_number=MCP9700-E/TO-ND
-N 73000 56400 74300 56400 4
+N 84200 71000 85500 71000 4
 {
-T 73000 56500 5 10 1 1 0 0 1
+T 84200 71100 5 10 1 1 0 0 1
 netname=v_usb
 }
-N 74300 56000 74200 56000 4
-N 74200 56000 74200 56400 4
-T 77900 51400 9 10 1 0 0 0 1
+N 85500 70600 85400 70600 4
+N 85400 70600 85400 71000 4
+T 89900 51400 9 10 1 0 0 0 1
 0.1
-T 75500 51400 9 10 1 0 0 0 1
+T 87500 51400 9 10 1 0 0 0 1
 1
-T 76100 51400 9 10 1 0 0 0 1
+T 88100 51400 9 10 1 0 0 0 1
 1
-T 73200 51400 9 10 1 0 0 0 1
+T 85200 51400 9 10 1 0 0 0 1
 usbtrng.sch
-T 73200 51100 9 10 1 0 0 0 1
+T 85200 51100 9 10 1 0 0 0 1
 http://altusmetrum.com/
 T 13300 -8600 8 10 0 1 0 0 1
 vendor_part_number=MMA7260QT-ND
 T 13300 -8600 8 10 0 1 0 0 1
 vendor_part_number=MCP9700-E/TO-ND
-C 77500 56400 1 0 0 3.3V-plus.sym
-N 76400 56400 77700 56400 4
-C 77900 55500 1 90 0 capacitor.sym
+C 88700 71000 1 0 0 3.3V-plus.sym
+N 87600 71000 88900 71000 4
+C 89100 70100 1 90 0 capacitor.sym
 {
-T 77200 55700 5 10 0 0 90 0 1
+T 88400 70300 5 10 0 0 90 0 1
 device=CAPACITOR
-T 78200 56300 5 10 1 1 180 0 1
-refdes=C3
-T 77000 55700 5 10 0 0 90 0 1
+T 89400 70900 5 10 1 1 180 0 1
+refdes=C13
+T 88200 70300 5 10 0 0 90 0 1
 symversion=0.1
-T 77800 55600 5 10 1 1 0 0 1
+T 89000 70200 5 10 1 1 0 0 1
 value=1uF
-T 77900 55500 5 10 0 0 0 0 1
+T 89100 70100 5 10 0 0 0 0 1
 vendor_part_number=490-1320-1-ND
-T 77900 55500 5 10 0 0 0 0 1
+T 89100 70100 5 10 0 0 0 0 1
 footprint=0402
-T 77900 55500 5 10 0 0 0 0 1
+T 89100 70100 5 10 0 0 0 0 1
 vendor=digikey
-T 77900 55500 5 10 0 1 0 0 1
+T 89100 70100 5 10 0 1 0 0 1
 loadstatus=smt
 }
-C 77600 55200 1 0 0 gnd.sym
-C 76500 56000 1 270 0 capacitor.sym
+C 88800 69800 1 0 0 gnd.sym
+C 87700 70600 1 270 0 capacitor.sym
 {
-T 77200 55800 5 10 0 0 270 0 1
+T 88400 70400 5 10 0 0 270 0 1
 device=CAPACITOR
-T 76900 55800 5 10 1 1 0 0 1
-refdes=C2
-T 77400 55800 5 10 0 0 270 0 1
+T 88100 70400 5 10 1 1 0 0 1
+refdes=C12
+T 88600 70400 5 10 0 0 270 0 1
 symversion=0.1
-T 76900 55200 5 10 1 1 0 0 1
+T 88100 69800 5 10 1 1 0 0 1
 value=10nF
-T 76500 56000 5 10 0 0 270 0 1
+T 87700 70600 5 10 0 0 270 0 1
 vendor_part_number=709-1132-1-ND
-T 76500 56000 5 10 0 0 270 0 1
+T 87700 70600 5 10 0 0 270 0 1
 footprint=0402
-T 76500 56000 5 10 0 0 270 0 1
+T 87700 70600 5 10 0 0 270 0 1
 vendor=digikey
-T 76500 56000 5 10 0 1 270 0 1
+T 87700 70600 5 10 0 1 270 0 1
 loadstatus=smt
 }
-C 74300 55500 1 0 0 TC2185.sym
+C 85500 70100 1 0 0 TC2185.sym
 {
-T 74595 56695 5 10 1 1 0 0 1
-refdes=U2
-T 74895 56195 5 10 0 1 0 0 1
+T 85795 71295 5 10 1 1 0 0 1
+refdes=U4
+T 86095 70795 5 10 0 1 0 0 1
 device=IC
-T 74295 55495 5 10 0 1 0 0 1
+T 85495 70095 5 10 0 1 0 0 1
 footprint=SOT23-5
-T 75100 56700 5 10 1 1 0 0 1
+T 86300 71300 5 10 1 1 0 0 1
 value=TC2185-3.3
-T 74300 55500 5 10 0 0 0 0 1
+T 85500 70100 5 10 0 0 0 0 1
 vendor=digikey
-T 74300 55500 5 10 0 0 0 0 1
+T 85500 70100 5 10 0 0 0 0 1
 vendor_part_number=TC2185-3.3VCCT-ND
-T 74300 55500 5 10 0 0 0 0 1
+T 85500 70100 5 10 0 0 0 0 1
 loadstatus=smt
 }
-C 76600 54800 1 0 0 gnd.sym
-N 76400 56000 76700 56000 4
-C 73700 55100 1 90 0 capacitor.sym
+C 87800 69400 1 0 0 gnd.sym
+N 87600 70600 87900 70600 4
+C 84900 69700 1 90 0 capacitor.sym
 {
-T 73000 55300 5 10 0 0 90 0 1
+T 84200 69900 5 10 0 0 90 0 1
 device=CAPACITOR
-T 74000 55900 5 10 1 1 180 0 1
-refdes=C1
-T 72800 55300 5 10 0 0 90 0 1
+T 85200 70500 5 10 1 1 180 0 1
+refdes=C11
+T 84000 69900 5 10 0 0 90 0 1
 symversion=0.1
-T 73600 55200 5 10 1 1 0 0 1
+T 84800 69800 5 10 1 1 0 0 1
 value=1uF
-T 73700 55100 5 10 0 0 0 0 1
+T 84900 69700 5 10 0 0 0 0 1
 vendor_part_number=490-1320-1-ND
-T 73700 55100 5 10 0 0 0 0 1
+T 84900 69700 5 10 0 0 0 0 1
 footprint=0402
-T 73700 55100 5 10 0 0 0 0 1
+T 84900 69700 5 10 0 0 0 0 1
 vendor=digikey
-T 73700 55100 5 10 0 1 0 0 1
+T 84900 69700 5 10 0 1 0 0 1
 loadstatus=smt
 }
-N 73500 56000 73500 56400 4
+N 84700 70600 84700 71000 4
 T -30400 -57400 8 10 0 1 0 0 1
 vendor_part_number=MMA7260QT-ND
 T -30400 -57400 8 10 0 1 0 0 1
@@ -196,684 +196,1031 @@ T -28200 -66400 8 10 0 1 0 0 1
 vendor_part_number=MMA7260QT-ND
 T -28200 -66400 8 10 0 1 0 0 1
 vendor_part_number=MCP9700-E/TO-ND
-C 73400 54800 1 0 0 gnd.sym
-C 62700 57100 1 0 0 lpc11u1x.sym
+C 84600 69400 1 0 0 gnd.sym
+C 88200 58600 1 0 1 gnd.sym
+C 86700 59600 1 0 1 resistor.sym
 {
-T 62695 57100 5 10 0 1 0 0 1
-footprint=hvqfn33
-T 62700 57100 5 10 0 1 0 0 1
-device=IC
-T 62700 57100 5 10 0 1 0 0 1
-loadstatus=smt
-T 62700 57100 5 10 0 1 0 0 1
-vendor=avnet
-T 62700 57100 5 10 0 1 0 0 1
-vendor_part_number=LPC11U14FHI33/201
-T 63095 67000 5 10 1 1 0 0 1
-refdes=U1
-T 66800 67000 5 10 1 1 0 0 1
-value=LPC11U14FHI33
-}
-C 59000 60200 1 0 0 gnd.sym
-C 60500 61200 1 0 0 resistor.sym
-{
-T 60800 61600 5 10 0 0 0 0 1
+T 86400 60000 5 10 0 0 0 6 1
 device=RESISTOR
-T 60500 61200 5 10 0 1 0 0 1
+T 86700 59600 5 10 0 1 0 6 1
 footprint=0402
-T 60500 61200 5 10 0 1 0 0 1
+T 86700 59600 5 10 0 1 0 6 1
 loadstatus=smt
-T 60500 61200 5 10 0 1 0 0 1
+T 86700 59600 5 10 0 1 0 6 1
 vendor=digikey
-T 60500 61200 5 10 0 1 0 0 1
+T 86700 59600 5 10 0 1 0 6 1
 vendor_part_number=P33.0LCT-ND
-T 60650 61450 5 10 1 1 0 0 1
-refdes=R10
-T 61100 61450 5 10 1 1 0 0 1
+T 86550 59850 5 10 1 1 0 6 1
+refdes=R19
+T 86100 59850 5 10 1 1 0 6 1
 value=33
 }
-C 60500 60800 1 0 0 resistor.sym
+C 86700 59200 1 0 1 resistor.sym
 {
-T 60800 61200 5 10 0 0 0 0 1
+T 86400 59600 5 10 0 0 0 6 1
 device=RESISTOR
-T 60500 60800 5 10 0 1 0 0 1
+T 86700 59200 5 10 0 1 0 6 1
 footprint=0402
-T 60500 60800 5 10 0 1 0 0 1
+T 86700 59200 5 10 0 1 0 6 1
 loadstatus=smt
-T 60500 60800 5 10 0 1 0 0 1
+T 86700 59200 5 10 0 1 0 6 1
 vendor=digikey
-T 60500 60800 5 10 0 1 0 0 1
+T 86700 59200 5 10 0 1 0 6 1
 vendor_part_number=P33.0LCT-ND
-T 60650 60550 5 10 1 1 0 0 1
-refdes=R11
-T 61100 60550 5 10 1 1 0 0 1
+T 86550 58950 5 10 1 1 0 6 1
+refdes=R20
+T 86100 58950 5 10 1 1 0 6 1
 value=33
 }
-N 59100 61300 60500 61300 4
-N 59100 60900 60500 60900 4
-C 61600 57700 1 90 0 capacitor.sym
+N 88100 59700 86700 59700 4
+N 88100 59300 86700 59300 4
+C 57500 51000 0 0 0 title-D-bdale.sym
+N 85800 59700 84500 59700 4
+N 85800 59300 84500 59300 4
+C 60100 60300 1 90 0 resistor.sym
 {
-T 60900 57900 5 10 0 0 90 0 1
-device=CAPACITOR
-T 60700 57900 5 10 0 0 90 0 1
-symversion=0.1
-T 61600 57700 5 10 0 1 0 0 1
-vendor_part_number=399-3027-1-ND
-T 61600 57700 5 10 0 0 0 0 1
+T 59700 60600 5 10 0 0 90 0 1
+device=RESISTOR
+T 60100 60300 5 10 0 1 90 0 1
 footprint=0402
-T 61600 57700 5 10 0 0 0 0 1
+T 60100 60300 5 10 0 1 90 0 1
+loadstatus=smt
+T 60100 60300 5 10 0 1 90 0 1
 vendor=digikey
-T 61600 57700 5 10 0 1 0 0 1
+T 60100 60300 5 10 0 1 90 0 1
+vendor_part_number=P150KLCT-ND
+T 59800 61000 5 10 1 1 180 0 1
+refdes=R4
+T 59800 60700 5 10 1 1 180 0 1
+value=150k
+}
+C 60500 58900 1 0 0 npn.sym
+{
+T 61100 59400 5 10 0 0 0 0 1
+device=NPN_TRANSISTOR
+T 60500 58900 5 10 0 1 0 0 1
+footprint=SOT23
+T 60500 58900 5 10 0 1 0 0 1
 loadstatus=smt
-T 61200 58500 5 10 1 1 180 0 1
-refdes=C4
-T 60800 57800 5 10 1 1 0 0 1
-value=0.1uF
+T 60500 58900 5 10 0 1 0 0 1
+vendor_part_number=MMBT3904-FDICT-ND
+T 60500 58900 5 10 0 1 0 0 1
+vendor=digikey
+T 61100 59400 5 10 1 1 0 0 1
+refdes=Q3
+T 61100 59200 5 10 1 1 0 0 1
+value=MMBT3904
 }
-C 62500 57400 1 90 0 capacitor.sym
+C 60900 58600 1 0 0 gnd.sym
+N 87300 60100 88100 60100 4
 {
-T 61800 57600 5 10 0 0 90 0 1
-device=CAPACITOR
-T 61600 57600 5 10 0 0 90 0 1
-symversion=0.1
-T 62500 57400 5 10 0 1 0 0 1
-vendor_part_number=399-3027-1-ND
-T 62500 57400 5 10 0 0 0 0 1
+T 87800 60200 5 10 1 1 0 6 1
+netname=v_usb
+}
+C 88100 58500 1 0 0 USB.sym
+{
+T 88995 60500 5 10 1 1 0 0 1
+refdes=J1
+T 88455 58895 5 10 0 1 0 0 1
+footprint=usbAmale
+T 88100 58500 5 10 0 1 0 6 1
+vendor_part_number=931K-ND
+T 88100 58500 5 10 0 1 0 6 1
+footprint=usbAmale
+T 88100 58500 5 10 0 1 0 6 1
+device=CONNECT?OR
+T 88100 58500 5 10 0 1 0 6 1
+loadstatus=handload
+T 88100 58500 5 10 0 1 0 6 1
+vendor=digikey
+}
+C 88000 65400 1 180 0 resistor.sym
+{
+T 87700 65000 5 10 0 0 180 0 1
+device=RESISTOR
+T 88000 65400 5 10 0 0 180 0 1
 footprint=0402
-T 62500 57400 5 10 0 0 0 0 1
+T 88000 65400 5 10 0 0 180 0 1
 vendor=digikey
-T 62500 57400 5 10 0 1 0 0 1
+T 88000 65400 5 10 0 0 180 0 1
+vendor_part_number=P1.00KLCT-ND
+T 88000 65400 5 10 0 0 180 0 1
 loadstatus=smt
-T 62100 58200 5 10 1 1 180 0 1
-refdes=C5
-T 61700 57500 5 10 1 1 0 0 1
-value=0.1uF
+T 87600 65500 5 10 1 1 0 0 1
+refdes=R17
+T 87200 65500 5 10 1 1 0 0 1
+value=1k
 }
-C 62100 58900 1 0 0 3.3V-plus.sym
-C 62200 56800 1 0 0 gnd.sym
-C 62050 66100 1 270 0 capacitor.sym
+C 88000 65000 1 180 0 resistor.sym
 {
-T 62750 65900 5 10 0 0 270 0 1
-device=CAPACITOR
-T 62950 65900 5 10 0 0 270 0 1
-symversion=0.1
-T 62050 66100 5 10 0 0 0 0 1
-vendor_part_number=490-6203-1-ND
-T 62050 66100 5 10 0 0 0 0 1
+T 87700 64600 5 10 0 0 180 0 1
+device=RESISTOR
+T 88000 65000 5 10 0 0 180 0 1
 footprint=0402
-T 62050 66100 5 10 0 0 0 0 1
+T 88000 65000 5 10 0 0 180 0 1
+vendor=digikey
+T 88000 65000 5 10 0 0 180 0 1
+vendor_part_number=P1.00KLCT-ND
+T 88000 65000 5 10 0 0 180 0 1
+loadstatus=smt
+T 87600 64500 5 10 1 1 0 0 1
+refdes=R18
+T 87200 64500 5 10 1 1 0 0 1
+value=1k
+}
+C 88700 64600 1 0 1 gnd.sym
+N 87100 65300 84500 65300 4
+{
+T 86700 65600 5 10 1 1 180 0 1
+netname=led_red
+}
+N 87100 64900 85800 64900 4
+{
+T 86900 65150 5 10 1 1 180 0 1
+netname=led_green
+}
+N 88400 65300 88600 65300 4
+N 88400 64900 88600 64900 4
+C 88000 65400 1 180 1 led2.sym
+{
+T 87900 64800 5 10 0 0 180 6 1
+device=LED
+T 87950 65400 5 10 0 1 180 6 1
+footprint=0605
+T 88000 65400 5 10 0 0 0 0 1
 vendor=digikey
-T 62050 66100 5 10 0 1 0 0 1
+T 88000 65400 5 10 0 0 0 0 1
+vendor_part_number=160-1452-1-ND
+T 88000 65400 5 10 0 0 0 0 1
+value=dualLED
+T 88000 65400 5 10 0 0 0 0 1
+loadstatus=smt
+T 88150 65600 5 10 1 1 180 6 1
+refdes=D3
+}
+N 88600 65300 88600 64900 4
+C 60200 59400 1 90 0 zener.sym
+{
+T 59600 59800 5 10 0 0 90 0 1
+device=ZENER_DIODE
+T 59700 60100 5 10 1 1 180 0 1
+refdes=D2
+T 58800 59600 5 10 1 1 0 0 1
+value=ZXRE1004
+T 60200 59400 5 10 0 0 0 0 1
+footprint=SOT23
+T 60200 59400 5 10 0 0 0 0 1
+vendor_part_number=ZXRE1004FFCT-ND
+T 60200 59400 5 10 0 0 0 0 1
+vendor=digikey
+T 60200 59400 5 10 0 1 0 0 1
 loadstatus=smt
-T 62450 65800 5 10 1 1 0 0 1
-refdes=C7
-T 62450 65300 5 10 1 1 0 0 1
-value=18pF
 }
-C 60750 66100 1 270 0 capacitor.sym
+N 60500 59400 60000 59400 4
+C 61100 60300 1 90 0 resistor.sym
 {
-T 61450 65900 5 10 0 0 270 0 1
+T 60700 60600 5 10 0 0 90 0 1
+device=RESISTOR
+T 61100 60300 5 10 0 1 90 0 1
+footprint=0402
+T 61100 60300 5 10 0 1 90 0 1
+loadstatus=smt
+T 61100 60300 5 10 0 1 90 0 1
+vendor=digikey
+T 60800 61000 5 10 1 1 180 0 1
+refdes=R6
+T 60800 60700 5 10 1 1 180 0 1
+value=1k
+T 61100 60300 5 10 0 0 0 0 1
+vendor_part_number=P1.00KLCT-ND
+}
+N 61000 59900 61000 60300 4
+N 61300 60100 61000 60100 4
+C 62200 60300 1 180 0 capacitor.sym
+{
+T 62000 59600 5 10 0 0 180 0 1
 device=CAPACITOR
-T 61650 65900 5 10 0 0 270 0 1
+T 62000 59400 5 10 0 0 180 0 1
 symversion=0.1
-T 60750 66100 5 10 0 0 0 0 1
-vendor_part_number=490-6203-1-ND
-T 60750 66100 5 10 0 0 0 0 1
+T 62200 60300 5 10 0 1 90 0 1
+vendor_part_number=399-3027-1-ND
+T 62200 60300 5 10 0 0 90 0 1
 footprint=0402
-T 60750 66100 5 10 0 0 0 0 1
+T 62200 60300 5 10 0 0 90 0 1
 vendor=digikey
-T 60750 66100 5 10 0 1 0 0 1
+T 62200 60300 5 10 0 1 90 0 1
 loadstatus=smt
-T 60450 65800 5 10 1 1 0 0 1
+T 61363 60248 5 10 1 1 0 0 1
 refdes=C6
-T 60350 65300 5 10 1 1 0 0 1
-value=18pF
+T 62300 60400 5 10 1 1 180 0 1
+value=100pF
 }
-C 62150 64900 1 0 0 gnd.sym
-C 60850 64900 1 0 0 gnd.sym
-C 61250 65700 1 0 0 ABM8.sym
+C 63600 59900 1 0 0 opamp-dual.sym
 {
-T 61450 66200 5 10 0 0 0 0 1
-device=CRYSTAL
-T 61450 66400 5 10 0 0 0 0 1
+T 64700 61200 5 10 0 0 0 0 1
+device=IC
+T 64300 60600 5 10 1 1 0 0 1
+refdes=U2
+T 64700 61800 5 10 0 0 0 0 1
 symversion=0.1
-T 61250 65700 5 10 0 0 0 0 1
-vendor_part_number=535-10901-1-ND
-T 61250 65700 5 10 0 0 0 0 1
-footprint=ABM8
-T 61250 65700 5 10 0 0 0 0 1
-vendor=digikey
-T 61250 65700 5 10 0 1 0 0 1
-loadstatus=smt
-T 61150 66200 5 10 1 1 0 0 1
-refdes=X1
-T 61850 66200 5 10 1 1 0 0 1
-value=12MHz
-}
-C 61850 65400 1 0 0 gnd.sym
-C 61150 65400 1 0 0 gnd.sym
-N 61250 66100 60950 66100 4
-N 60950 66100 60950 66500 4
-N 61950 66100 62700 66100 4
-N 60950 66500 62700 66500 4
-C 60350 61500 1 90 0 resistor.sym
-{
-T 59950 61800 5 10 0 0 90 0 1
-device=RESISTOR
-T 60350 61500 5 10 0 1 0 0 1
-footprint=0402
-T 60350 61500 5 10 0 1 0 0 1
-loadstatus=smt
-T 60350 61500 5 10 0 1 0 0 1
+T 63600 59900 5 10 0 0 0 0 1
+slot=1
+T 63600 59900 5 10 0 0 0 0 1
+vendor_part_number=MCP6L92T-E/MSCT-ND
+T 63600 59900 5 10 0 0 0 0 1
 vendor=digikey
-T 60350 61500 5 10 0 1 0 0 1
-vendor_part_number=P1.50KLCT-ND
-T 59750 62000 5 10 1 1 0 0 1
-refdes=R9
-T 59750 61750 5 10 1 1 0 0 1
-value=1.5k
+T 63600 59900 5 10 0 0 0 0 1
+footprint=MSOP8
+T 63600 59900 5 10 0 1 0 0 1
+loadstatus=smt
 }
-N 60250 61500 60250 60900 4
-N 69700 60500 68700 60500 4
+C 66900 60100 1 0 0 opamp-dual.sym
 {
-T 71300 60150 5 10 1 1 0 6 1
-netname=swdio
+T 68000 61400 5 10 0 0 0 0 1
+device=IC
+T 67600 60800 5 10 1 1 0 0 1
+refdes=U2
+T 68000 62000 5 10 0 0 0 0 1
+symversion=0.1
+T 66900 60100 5 10 0 0 0 0 1
+slot=2
+T 66900 60100 5 10 0 0 0 0 1
+vendor_part_number=MCP6L92T-E/MSCT-ND
+T 66900 60100 5 10 0 0 0 0 1
+vendor=digikey
+T 66900 60100 5 10 0 0 0 0 1
+footprint=MSOP8
+T 66900 60100 5 10 0 1 0 0 1
+loadstatus=smt
 }
-N 69700 62500 68700 62500 4
+N 63600 60500 63500 60500 4
+N 63500 60500 63500 61800 4
+N 64800 61800 66700 61800 4
+N 66700 61800 66700 60700 4
+N 66700 60700 66900 60700 4
+C 64700 59300 1 180 0 resistor.sym
 {
-T 69700 62550 5 10 1 1 0 6 1
-netname=swclk
+T 64400 58900 5 10 0 0 180 0 1
+device=RESISTOR
+T 64700 59300 5 10 0 1 180 0 1
+footprint=0402
+T 64700 59300 5 10 0 1 180 0 1
+loadstatus=smt
+T 64700 59300 5 10 0 1 180 0 1
+vendor=digikey
+T 63800 58900 5 10 1 1 0 0 1
+refdes=R11
+T 64300 58900 5 10 1 1 0 0 1
+value=100k
+T 64700 59300 5 10 0 1 0 0 1
+vendor_part_number=P1.00MLCT-ND
 }
-N 69700 66500 68700 66500 4
+N 63800 59200 63400 59200 4
+N 63400 59200 63400 60100 4
+N 64700 59200 65000 59200 4
+N 65000 59200 65000 60300 4
+C 64000 59600 1 0 0 gnd.sym
+C 67300 59800 1 0 0 gnd.sym
+C 64900 61900 1 90 0 resistor.sym
 {
-T 69700 66550 5 10 1 1 0 6 1
-netname=reset_n
+T 64500 62200 5 10 0 0 90 0 1
+device=RESISTOR
+T 64900 61900 5 10 0 1 90 0 1
+footprint=0402
+T 64900 61900 5 10 0 1 90 0 1
+loadstatus=smt
+T 64900 61900 5 10 0 1 90 0 1
+vendor=digikey
+T 65000 62400 5 10 1 1 0 0 1
+refdes=R9
+T 65000 62100 5 10 1 1 0 0 1
+value=100k
+T 64900 61900 5 10 0 0 270 0 1
+vendor_part_number=P1.00MLCT-ND
 }
-N 71600 60500 70850 60500 4
+C 64900 60800 1 90 0 resistor.sym
 {
-T 70850 60550 5 10 1 1 0 0 1
-netname=reset_n
+T 64500 61100 5 10 0 0 90 0 1
+device=RESISTOR
+T 64900 60800 5 10 0 1 90 0 1
+footprint=0402
+T 64900 60800 5 10 0 1 90 0 1
+loadstatus=smt
+T 64900 60800 5 10 0 1 90 0 1
+vendor=digikey
+T 65000 61300 5 10 1 1 0 0 1
+refdes=R10
+T 65000 61000 5 10 1 1 0 0 1
+value=100k
+T 64900 60800 5 10 0 1 270 0 1
+vendor_part_number=P1.00MLCT-ND
 }
-N 71600 59700 70850 59700 4
+N 64800 61900 64800 61700 4
+C 64700 60500 1 0 0 gnd.sym
+N 72100 63800 73100 63800 4
 {
-T 70850 59800 5 10 1 1 0 0 1
-netname=swclk
+T 72100 63900 5 10 1 1 0 0 1
+netname=randombits_1
 }
-C 71500 60600 1 0 0 gnd.sym
-N 68700 59300 71600 59300 4
+N 69200 60500 67900 60500 4
 {
-T 70850 59350 5 10 1 1 0 0 1
-netname=rxd
+T 68100 60600 5 10 1 1 0 0 1
+netname=randombits_1
 }
-N 68700 58900 71600 58900 4
+T 58000 58100 9 10 1 0 0 0 5
+select R71 for at least 8uA,
+less current -> more noise
+
+select R72 for Q1 collector
+voltage near 1.65V (VCC/2)
+C 59400 65000 1 0 0 AP3015.sym
 {
-T 70850 58950 5 10 1 1 0 0 1
-netname=txd
+T 59795 66195 5 10 1 1 0 0 1
+refdes=U1
+T 60195 65695 5 10 1 1 0 0 1
+device=AP3015
+T 59395 64995 5 10 0 1 0 0 1
+footprint=SOT23-5
 }
-C 71600 58800 1 0 0 conn-6.sym
+C 61500 66300 1 0 0 diode.sym
 {
-T 71600 58800 5 10 0 1 0 0 1
-footprint=530470610
-T 71600 58800 5 10 0 1 0 0 1
-device=CONNECTOR
-T 71600 58800 5 10 0 1 0 0 1
-loadstatus=noload
-T 71600 58800 5 10 0 1 0 0 1
+T 61900 66900 5 10 0 0 0 0 1
+device=DIODE
+T 61800 66800 5 10 1 1 0 0 1
+refdes=D1
+T 61500 66300 5 10 0 0 0 0 1
 vendor=digikey
-T 71600 58800 5 10 0 1 0 0 1
-vendor_part_number=WM1735-ND
-T 71955 61095 5 10 1 1 0 0 1
-refdes=J4
-T 71800 58600 5 10 1 1 0 0 1
-value=Debug
+T 61500 66300 5 10 0 0 0 0 1
+vendor_part_number=DFLS130LDICT-ND
+T 61500 66300 5 10 0 0 0 0 1
+footprint=powerdi123
+T 61500 66300 5 10 0 0 0 0 1
+loadstatus=smt
+T 61500 66000 5 10 1 1 0 0 1
+value=DFLS130L
 }
-C 68700 66000 1 0 0 nc-right.sym
+C 62300 66500 1 270 0 resistor.sym
 {
-T 68800 66500 5 10 0 0 0 0 1
-value=NoConnection
-T 68800 66700 5 10 0 0 0 0 1
-device=DRC_Directive
+T 62700 66200 5 10 0 0 270 0 1
+device=RESISTOR
+T 62600 66100 5 10 1 1 0 0 1
+refdes=R1
+T 62600 65800 5 10 1 1 0 0 1
+value=470k
+T 62300 66500 5 10 0 0 0 0 1
+footprint=0402
 }
-C 68700 60000 1 0 0 nc-right.sym
+C 62300 65400 1 270 0 resistor.sym
 {
-T 68800 60500 5 10 0 0 0 0 1
-value=NoConnection
-T 68800 60700 5 10 0 0 0 0 1
-device=DRC_Directive
+T 62700 65100 5 10 0 0 270 0 1
+device=RESISTOR
+T 62600 65000 5 10 1 1 0 0 1
+refdes=R3
+T 62600 64700 5 10 1 1 0 0 1
+value=27k
+T 62300 65400 5 10 0 0 0 0 1
+footprint=0402
 }
-C 68700 59600 1 0 0 nc-right.sym
+C 58600 65900 1 270 0 capacitor.sym
 {
-T 68800 60100 5 10 0 0 0 0 1
-value=NoConnection
-T 68800 60300 5 10 0 0 0 0 1
-device=DRC_Directive
+T 59300 65700 5 10 0 0 270 0 1
+device=CAPACITOR
+T 58900 65600 5 10 1 1 0 0 1
+refdes=C1
+T 59500 65700 5 10 0 0 270 0 1
+symversion=0.1
+T 58900 65100 5 10 1 1 0 0 1
+value=4.7uF
+T 58600 65900 5 10 0 0 0 0 1
+footprint=0402
 }
-C 62200 63500 1 0 0 nc-left.sym
+C 63100 66000 1 270 0 capacitor.sym
 {
-T 62200 63900 5 10 0 0 0 0 1
-value=NoConnection
-T 62200 64300 5 10 0 0 0 0 1
-device=DRC_Directive
+T 63800 65800 5 10 0 0 270 0 1
+device=CAPACITOR
+T 63400 65700 5 10 1 1 0 0 1
+refdes=C3
+T 64000 65800 5 10 0 0 270 0 1
+symversion=0.1
+T 63400 65200 5 10 1 1 0 0 1
+value=1uF
+T 63100 66000 5 10 0 0 0 0 1
+footprint=0402
 }
-N 62300 57100 62300 57400 4
-N 62300 58300 62300 58900 4
-N 62700 58500 62300 58500 4
-N 61400 58900 62700 58900 4
-N 62700 57300 62300 57300 4
-N 61400 58600 61400 58900 4
-N 61400 57700 61400 57300 4
-N 61400 57300 62300 57300 4
-N 71600 60100 69700 60100 4
-N 69700 60100 69700 60500 4
-N 60250 63050 60250 62400 4
+N 59400 65500 59400 66500 4
+N 58800 66500 60000 66500 4
+C 58600 66500 1 0 0 3.3V-plus.sym
+N 60900 66500 61500 66500 4
+N 61500 66500 61500 65900 4
+N 61500 65500 62400 65500 4
+N 62400 65400 62400 65600 4
+N 62400 66500 63700 66500 4
 {
-T 59800 63150 5 10 1 1 0 0 1
-netname=usb_pullup
+T 62800 66600 5 10 1 1 0 0 1
+netname=20V
 }
-N 69700 64100 68700 64100 4
+N 63300 66500 63300 66000 4
+N 63300 65100 63300 64500 4
+N 58800 64500 63300 64500 4
+N 60500 64500 60500 65000 4
+N 58800 65000 58800 64500 4
+C 60000 66400 1 0 0 inductor.sym
 {
-T 69700 64150 5 10 1 1 0 6 1
-netname=usb_pullup
+T 60200 66900 5 10 0 0 0 0 1
+device=INDUCTOR
+T 60350 66700 5 10 1 1 0 0 1
+refdes=L1
+T 60200 67100 5 10 0 0 0 0 1
+symversion=0.1
+T 60200 66250 5 10 1 1 0 0 1
+value=10uH
+T 60000 66400 5 10 0 1 0 0 1
+vendor=digikey
+T 60000 66400 5 10 0 1 0 0 1
+vendor_part_number=308-2200-1-ND
+T 60000 66400 5 10 0 1 0 0 1
+footprint=CR32
+T 60000 66400 5 10 0 1 0 0 1
+loadstatus=smt
 }
-C 57500 51000 0 0 0 title-C-bdale.sym
-N 61400 61300 62700 61300 4
-N 61400 60900 62700 60900 4
-C 68700 65600 1 0 0 nc-right.sym
+C 66400 66300 1 0 0 capacitor.sym
 {
-T 68800 66100 5 10 0 0 0 0 1
-value=NoConnection
-T 68800 66300 5 10 0 0 0 0 1
-device=DRC_Directive
+T 66600 67000 5 10 0 0 0 0 1
+device=CAPACITOR
+T 66700 66800 5 10 1 1 0 0 1
+refdes=C5
+T 66600 67200 5 10 0 0 0 0 1
+symversion=0.1
+T 66700 66100 5 10 1 1 0 0 1
+value=1uF
+T 66400 66300 5 10 0 1 0 0 1
+footprint=0402
 }
-C 68700 58400 1 0 0 nc-right.sym
+C 67200 68100 1 270 0 resistor.sym
 {
-T 68800 58900 5 10 0 0 0 0 1
-value=NoConnection
-T 68800 59100 5 10 0 0 0 0 1
-device=DRC_Directive
+T 67600 67800 5 10 0 0 270 0 1
+device=RESISTOR
+T 67500 67800 5 10 1 1 0 0 1
+refdes=R5
+T 67500 67400 5 10 1 1 0 0 1
+value=470K
+T 67200 68100 5 10 0 0 0 0 1
+footprint=0402
 }
-C 68700 62800 1 0 0 nc-right.sym
+C 63700 66400 1 0 0 resistor.sym
 {
-T 68800 63300 5 10 0 0 0 0 1
-value=NoConnection
-T 68800 63500 5 10 0 0 0 0 1
-device=DRC_Directive
+T 64000 66800 5 10 0 0 0 0 1
+device=RESISTOR
+T 64000 66700 5 10 1 1 0 0 1
+refdes=R2
+T 63900 66100 5 10 1 1 0 0 1
+value=4.7K
+T 63700 66400 5 10 0 0 0 0 1
+footprint=0402
 }
-C 68700 63200 1 0 0 nc-right.sym
+C 68000 68100 1 270 0 resistor.sym
 {
-T 68800 63700 5 10 0 0 0 0 1
-value=NoConnection
-T 68800 63900 5 10 0 0 0 0 1
-device=DRC_Directive
+T 68400 67800 5 10 0 0 270 0 1
+device=RESISTOR
+T 68300 67800 5 10 1 1 0 0 1
+refdes=R7
+T 68300 67400 5 10 1 1 0 0 1
+value=4.7K
+T 68000 68100 5 10 0 0 0 0 1
+footprint=0402
 }
-C 68700 62000 1 0 0 nc-right.sym
+N 65600 65700 65400 65700 4
+N 64600 66500 66400 66500 4
+N 64900 66500 64900 66200 4
+N 66100 66500 66100 66200 4
+C 66000 64900 1 0 0 gnd.sym
+N 67300 66500 67600 66500 4
+N 67300 66500 67300 67200 4
+N 68100 67000 68100 67200 4
+C 65900 68100 1 270 0 capacitor.sym
 {
-T 68800 62500 5 10 0 0 0 0 1
-value=NoConnection
-T 68800 62700 5 10 0 0 0 0 1
-device=DRC_Directive
+T 66600 67900 5 10 0 0 270 0 1
+device=CAPACITOR
+T 66200 67800 5 10 1 1 0 0 1
+refdes=C4
+T 66800 67900 5 10 0 0 270 0 1
+symversion=0.1
+T 66200 67400 5 10 1 1 0 0 1
+value=1uF
+T 65900 68100 5 10 0 1 0 0 1
+footprint=0402
 }
-C 68700 60800 1 0 0 nc-right.sym
+N 66100 68500 66100 68100 4
+N 66100 68300 68100 68300 4
+N 67300 68300 67300 68100 4
+N 68100 68300 68100 68100 4
+C 65900 69400 1 0 0 3.3V-plus.sym
+C 68000 65700 1 0 0 gnd.sym
+C 66000 66900 1 0 0 gnd.sym
+N 68100 67100 69200 67100 4
 {
-T 68800 61300 5 10 0 0 0 0 1
-value=NoConnection
-T 68800 61500 5 10 0 0 0 0 1
-device=DRC_Directive
+T 68200 67200 5 10 1 1 0 0 1
+netname=randombits_2
 }
-C 68700 61600 1 0 0 nc-right.sym
+C 66000 69400 1 270 0 inductor.sym
 {
-T 68800 62100 5 10 0 0 0 0 1
-value=NoConnection
-T 68800 62300 5 10 0 0 0 0 1
-device=DRC_Directive
+T 66500 69200 5 10 0 0 270 0 1
+device=INDUCTOR
+T 66300 69100 5 10 1 1 0 0 1
+refdes=L3
+T 66700 69200 5 10 0 0 270 0 1
+symversion=0.1
+T 66300 68700 5 10 1 1 0 0 1
+value=bead
+T 66000 69400 5 10 0 1 270 0 1
+footprint=0402
+T 66000 69400 5 10 0 1 270 0 1
+vendor=digikey
+T 66000 69400 5 10 0 1 270 0 1
+vendor_part_number=240-2554-1-ND
+T 66000 69400 5 10 0 1 270 0 1
+loadstatus=smt
 }
-C 68700 61200 1 0 0 nc-right.sym
+C 64700 64800 1 0 0 nc-bottom.sym
 {
-T 68800 61700 5 10 0 0 0 0 1
+T 64700 65400 5 10 0 0 0 0 1
 value=NoConnection
-T 68800 61900 5 10 0 0 0 0 1
+T 64700 65800 5 10 0 0 0 0 1
 device=DRC_Directive
 }
-C 68700 57200 1 0 0 nc-right.sym
+C 60400 64200 1 0 0 gnd.sym
+C 78500 56600 1 0 0 gnd.sym
+C 78900 56600 1 0 0 gnd.sym
+N 84500 59900 84500 59700 4
+N 84500 58800 85500 58800 4
+N 85500 58800 85500 56800 4
+N 84500 58200 85100 58200 4
+N 85100 58200 85100 56400 4
+N 81300 56900 81300 56400 4
 {
-T 68800 57700 5 10 0 0 0 0 1
-value=NoConnection
-T 68800 57900 5 10 0 0 0 0 1
-device=DRC_Directive
+T 81400 56700 5 10 1 1 0 0 1
+netname=reset_n
 }
-C 62200 63900 1 0 0 nc-left.sym
+N 86500 62900 84500 62900 4
 {
-T 62200 64300 5 10 0 0 0 0 1
-value=NoConnection
-T 62200 64700 5 10 0 0 0 0 1
-device=DRC_Directive
+T 85200 63000 5 10 1 1 0 0 1
+netname=randombits_2
 }
-C 63200 54000 1 90 0 resistor.sym
+C 75600 70600 1 0 0 capacitor.sym
 {
-T 62800 54300 5 10 0 0 90 0 1
-device=RESISTOR
-T 63200 54000 5 10 0 1 90 0 1
+T 75800 71300 5 10 0 0 0 0 1
+device=CAPACITOR
+T 75700 70900 5 10 1 1 0 0 1
+refdes=C8
+T 75800 71500 5 10 0 0 0 0 1
+symversion=0.1
+T 76200 70900 5 10 1 1 0 0 1
+value=0.1uF
+T 75600 70600 5 10 0 1 0 0 1
 footprint=0402
-T 63200 54000 5 10 0 1 90 0 1
+T 75600 70600 5 10 0 1 0 0 1
 loadstatus=smt
-T 63200 54000 5 10 0 1 90 0 1
+T 75600 70600 5 10 0 1 0 0 1
 vendor=digikey
-T 63200 54000 5 10 0 1 90 0 1
-vendor_part_number=P150KLCT-ND
-T 62900 54700 5 10 1 1 180 0 1
-refdes=R71
-T 62900 54400 5 10 1 1 180 0 1
-value=150k
+T 75600 70600 5 10 0 1 0 0 1
+vendor_part_number=399-3027-1-ND
 }
-C 63600 52600 1 0 0 npn.sym
+C 75600 68600 1 0 0 capacitor.sym
 {
-T 64200 53100 5 10 0 0 0 0 1
-device=NPN_TRANSISTOR
-T 63600 52600 5 10 0 1 0 0 1
-footprint=SOT23
-T 63600 52600 5 10 0 1 0 0 1
+T 75800 69300 5 10 0 0 0 0 1
+device=CAPACITOR
+T 75700 68900 5 10 1 1 0 0 1
+refdes=C10
+T 75800 69500 5 10 0 0 0 0 1
+symversion=0.1
+T 76200 68900 5 10 1 1 0 0 1
+value=0.1uF
+T 75600 68600 5 10 0 1 0 0 1
+footprint=0402
+T 75600 68600 5 10 0 1 0 0 1
 loadstatus=smt
-T 63600 52600 5 10 0 1 0 0 1
-vendor_part_number=MMBT3904-FDICT-ND
-T 63600 52600 5 10 0 1 0 0 1
+T 75600 68600 5 10 0 1 0 0 1
 vendor=digikey
-T 64200 53100 5 10 1 1 0 0 1
-refdes=Q1
-T 64200 52900 5 10 1 1 0 0 1
-value=MMBT3904
+T 75600 68600 5 10 0 1 0 0 1
+vendor_part_number=399-3027-1-ND
 }
-C 64000 52300 1 0 0 gnd.sym
-N 59300 61700 59100 61700 4
-N 59300 61700 59300 63700 4
-N 59300 63700 59900 63700 4
+C 75600 69600 1 0 0 capacitor.sym
 {
-T 59400 63800 5 10 1 1 0 0 1
-netname=v_usb
+T 75800 70300 5 10 0 0 0 0 1
+device=CAPACITOR
+T 75700 70000 5 10 1 1 0 0 1
+refdes=C9
+T 75800 70500 5 10 0 0 0 0 1
+symversion=0.1
+T 76200 70000 5 10 1 1 0 0 1
+value=0.01uF
+T 75600 69600 5 10 0 0 0 0 1
+vendor_part_number=709-1132-1-ND
+T 75600 69600 5 10 0 0 0 0 1
+footprint=0402
+T 75600 69600 5 10 0 0 0 0 1
+vendor=digikey
+T 75600 69600 5 10 0 1 0 0 1
+loadstatus=smt
 }
-C 59100 60100 1 0 1 USB.sym
+N 76500 70800 77600 70800 4
+N 77600 70800 77600 68500 4
+N 76500 69800 77200 69800 4
+N 77200 69800 77200 68500 4
+N 76500 68800 76800 68800 4
+N 76800 68800 76800 68500 4
+N 76500 68800 76500 71400 4
+C 76300 71400 1 0 0 3.3V-plus.sym
+N 75600 68800 75600 70800 4
+C 75500 68500 1 0 0 gnd.sym
+C 74300 56900 1 0 0 STM32F042-32.sym
 {
-T 58205 62100 5 10 1 1 0 6 1
-refdes=J5
-T 58745 60495 5 10 0 1 0 6 1
-footprint=usbAmale
-T 59100 60100 5 10 0 1 0 0 1
-vendor_part_number=931K-ND
-T 59100 60100 5 10 0 1 0 0 1
-footprint=usbAmale
-T 59100 60100 5 10 0 1 0 0 1
-device=CONNECT?OR
-T 59100 60100 5 10 0 1 0 0 1
-loadstatus=handload
-T 59100 60100 5 10 0 1 0 0 1
-vendor=digikey
+T 67900 55300 5 10 0 0 0 0 1
+device=IC
+T 81600 67400 5 10 1 1 0 0 1
+value=STM32F042K6T
+T 74600 57200 5 10 0 1 0 0 1
+footprint=lqfp32
+T 74600 68400 5 10 1 1 0 0 1
+refdes=U3
 }
-C 72200 65400 1 180 0 resistor.sym
+C 72900 61600 1 180 0 resistor.sym
 {
-T 71900 65000 5 10 0 0 180 0 1
+T 72600 61200 5 10 0 0 180 0 1
 device=RESISTOR
-T 72200 65400 5 10 0 0 180 0 1
+T 72900 61600 5 10 0 0 90 0 1
 footprint=0402
-T 72200 65400 5 10 0 0 180 0 1
+T 72900 61600 5 10 0 0 90 0 1
+vendor_part_number=P10.0KLCT-ND
+T 72900 61600 5 10 0 0 90 0 1
 vendor=digikey
-T 72200 65400 5 10 0 0 180 0 1
-vendor_part_number=P1.00KLCT-ND
-T 72200 65400 5 10 0 0 180 0 1
+T 72900 61600 5 10 0 1 90 0 1
 loadstatus=smt
-T 71800 65500 5 10 1 1 0 0 1
-refdes=R52
-T 71400 65500 5 10 1 1 0 0 1
-value=1k
+T 72450 61825 5 10 1 1 180 0 1
+refdes=R15
+T 72500 61700 5 10 1 1 0 0 1
+value=10k
 }
-C 72200 65000 1 180 0 resistor.sym
+C 71900 61200 1 0 0 gnd.sym
+N 72900 61500 74300 61500 4
 {
-T 71900 64600 5 10 0 0 180 0 1
+T 73000 61600 5 10 1 1 0 0 1
+netname=boot0
+}
+C 74000 63700 1 0 1 resistor.sym
+{
+T 73700 64100 5 10 0 0 0 6 1
 device=RESISTOR
-T 72200 65000 5 10 0 0 180 0 1
+T 73500 63500 5 10 1 1 0 6 1
+refdes=R14
+T 73900 63500 5 10 1 1 0 6 1
+value=0
+T 74000 63700 5 10 0 1 0 0 1
 footprint=0402
-T 72200 65000 5 10 0 0 180 0 1
-vendor=digikey
-T 72200 65000 5 10 0 0 180 0 1
-vendor_part_number=P1.00KLCT-ND
-T 72200 65000 5 10 0 0 180 0 1
+T 74000 63700 5 10 0 1 0 0 1
 loadstatus=smt
-T 71800 64500 5 10 1 1 0 0 1
-refdes=R53
-T 71400 64500 5 10 1 1 0 0 1
-value=1k
+T 74000 63700 5 10 0 1 0 0 1
+vendor=digikey
+T 74000 63700 5 10 0 1 0 0 1
+vendor_part_number=P22.0LCT-ND
 }
-C 72900 64600 1 0 1 gnd.sym
-N 71300 65300 68700 65300 4
+C 85400 66400 1 0 1 resistor.sym
 {
-T 70900 65600 5 10 1 1 180 0 1
-netname=led_red
+T 85100 66800 5 10 0 0 0 6 1
+device=RESISTOR
+T 84900 66200 5 10 1 1 0 6 1
+refdes=R16
+T 85300 66200 5 10 1 1 0 6 1
+value=0
+T 85400 66400 5 10 0 1 0 0 1
+footprint=0402
+T 85400 66400 5 10 0 1 0 0 1
+loadstatus=smt
+T 85400 66400 5 10 0 1 0 0 1
+vendor=digikey
+T 85400 66400 5 10 0 1 0 0 1
+vendor_part_number=P22.0LCT-ND
 }
-N 71300 64900 70000 64900 4
+N 85400 66500 86500 66500 4
 {
-T 71100 65150 5 10 1 1 180 0 1
-netname=led_green
+T 85400 66600 5 10 1 1 0 0 1
+netname=randombits_1
 }
-N 72600 65300 72800 65300 4
-N 72600 64900 72800 64900 4
-C 72200 65400 1 180 1 led2.sym
+N 74000 63800 74300 63800 4
+N 84500 64700 85800 64700 4
+N 85800 64700 85800 64900 4
+C 63100 60200 1 180 0 resistor.sym
 {
-T 72100 64800 5 10 0 0 180 6 1
-device=LED
-T 72150 65400 5 10 0 1 180 6 1
-footprint=0605
-T 72200 65400 5 10 0 0 0 0 1
-vendor=digikey
-T 72200 65400 5 10 0 0 0 0 1
-vendor_part_number=160-1452-1-ND
-T 72200 65400 5 10 0 0 0 0 1
-value=dualLED
-T 72200 65400 5 10 0 0 0 0 1
+T 62800 59800 5 10 0 0 180 0 1
+device=RESISTOR
+T 63100 60200 5 10 0 1 180 0 1
+footprint=0402
+T 63100 60200 5 10 0 1 180 0 1
 loadstatus=smt
-T 72350 65600 5 10 1 1 180 6 1
-refdes=D2
+T 63100 60200 5 10 0 1 180 0 1
+vendor=digikey
+T 62200 59800 5 10 1 1 0 0 1
+refdes=R8
+T 62700 59800 5 10 1 1 0 0 1
+value=1k
+T 63100 60200 5 10 0 1 0 0 1
+vendor_part_number=P1.00MLCT-ND
 }
-N 72800 65300 72800 64900 4
-C 63300 53100 1 90 0 zener.sym
+N 63100 60100 63600 60100 4
+C 67800 59300 1 180 0 resistor.sym
 {
-T 62700 53500 5 10 0 0 90 0 1
-device=ZENER_DIODE
-T 62800 53800 5 10 1 1 180 0 1
-refdes=D1
-T 61900 53300 5 10 1 1 0 0 1
-value=ZXRE1004
-T 63300 53100 5 10 0 0 0 0 1
-footprint=SOT23
-T 63300 53100 5 10 0 0 0 0 1
-vendor_part_number=ZXRE1004FFCT-ND
-T 63300 53100 5 10 0 0 0 0 1
-vendor=digikey
-T 63300 53100 5 10 0 1 0 0 1
+T 67500 58900 5 10 0 0 180 0 1
+device=RESISTOR
+T 67800 59300 5 10 0 1 180 0 1
+footprint=0402
+T 67800 59300 5 10 0 1 180 0 1
 loadstatus=smt
+T 67800 59300 5 10 0 1 180 0 1
+vendor=digikey
+T 66900 58900 5 10 1 1 0 0 1
+refdes=R13
+T 67400 58900 5 10 1 1 0 0 1
+value=100k
+T 67800 59300 5 10 0 1 0 0 1
+vendor_part_number=P1.00MLCT-ND
 }
-N 63600 53100 63100 53100 4
-C 62900 54900 1 0 0 3.3V-plus.sym
-C 64200 54000 1 90 0 resistor.sym
+C 66800 60400 1 180 0 resistor.sym
 {
-T 63800 54300 5 10 0 0 90 0 1
+T 66500 60000 5 10 0 0 180 0 1
 device=RESISTOR
-T 64200 54000 5 10 0 1 90 0 1
+T 66800 60400 5 10 0 1 180 0 1
 footprint=0402
-T 64200 54000 5 10 0 1 90 0 1
+T 66800 60400 5 10 0 1 180 0 1
 loadstatus=smt
-T 64200 54000 5 10 0 1 90 0 1
+T 66800 60400 5 10 0 1 180 0 1
 vendor=digikey
-T 63900 54700 5 10 1 1 180 0 1
-refdes=R72
-T 63900 54400 5 10 1 1 180 0 1
+T 65900 60000 5 10 1 1 0 0 1
+refdes=R12
+T 66400 60000 5 10 1 1 0 0 1
 value=1k
-T 64200 54000 5 10 0 0 0 0 1
-vendor_part_number=P1.00KLCT-ND
+T 66800 60400 5 10 0 1 0 0 1
+vendor_part_number=P1.00MLCT-ND
 }
-C 63900 54900 1 0 0 3.3V-plus.sym
-N 64100 53600 64100 54000 4
-N 64400 53800 64100 53800 4
-C 65300 54000 1 180 0 capacitor.sym
+N 64600 60300 65000 60300 4
+N 66800 60300 66900 60300 4
+N 66900 59200 66800 59200 4
+N 66800 59200 66800 60300 4
+N 67800 59200 68100 59200 4
+N 68100 59200 68100 60500 4
+C 65900 60500 1 180 0 capacitor.sym
 {
-T 65100 53300 5 10 0 0 180 0 1
+T 65700 59800 5 10 0 0 180 0 1
 device=CAPACITOR
-T 65100 53100 5 10 0 0 180 0 1
+T 65700 59600 5 10 0 0 180 0 1
 symversion=0.1
-T 65300 54000 5 10 0 1 90 0 1
+T 65900 60500 5 10 0 1 90 0 1
 vendor_part_number=399-3027-1-ND
-T 65300 54000 5 10 0 0 90 0 1
+T 65900 60500 5 10 0 0 90 0 1
 footprint=0402
-T 65300 54000 5 10 0 0 90 0 1
+T 65900 60500 5 10 0 0 90 0 1
 vendor=digikey
-T 65300 54000 5 10 0 1 90 0 1
+T 65900 60500 5 10 0 1 90 0 1
 loadstatus=smt
-T 64463 53948 5 10 1 1 0 0 1
-refdes=C8
-T 65400 54100 5 10 1 1 180 0 1
-value=0.1uF
+T 65063 60448 5 10 1 1 0 0 1
+refdes=C7
+T 66000 60600 5 10 1 1 180 0 1
+value=100pF
 }
-C 65700 53600 1 0 0 opamp-dual.sym
+C 87400 56300 1 0 0 conn-4.sym
 {
-T 66800 54900 5 10 0 0 0 0 1
-device=IC
-T 66400 54300 5 10 1 1 0 0 1
-refdes=U3
-T 66800 55500 5 10 0 0 0 0 1
-symversion=0.1
-T 65700 53600 5 10 0 0 0 0 1
-slot=1
-T 65700 53600 5 10 0 0 0 0 1
-vendor_part_number=MCP6L92T-E/MSCT-ND
-T 65700 53600 5 10 0 0 0 0 1
+T 87400 56300 5 10 0 0 0 0 1
+footprint=0-215079-4
+T 87400 56300 5 10 0 0 0 0 1
+vendor_part_number=A99472CT-ND
+T 87400 56300 5 10 0 0 0 0 1
 vendor=digikey
-T 65700 53600 5 10 0 0 0 0 1
-footprint=MSOP8
-T 65700 53600 5 10 0 1 0 0 1
-loadstatus=smt
+T 87400 56300 5 10 0 0 0 0 1
+loadstatus=noload
+T 87400 56300 5 10 0 0 0 0 1
+device=CONNECTOR
+T 87800 57900 5 10 1 1 0 0 1
+refdes=J2
+T 87600 56100 5 10 1 1 0 0 1
+value=Debug
 }
-C 67200 53800 1 0 0 opamp-dual.sym
+C 87000 57300 1 0 0 gnd.sym
+N 87100 57600 87400 57600 4
+N 87400 57200 86100 57200 4
 {
-T 68300 55100 5 10 0 0 0 0 1
-device=IC
-T 67900 54500 5 10 1 1 0 0 1
-refdes=U3
-T 68300 55700 5 10 0 0 0 0 1
-symversion=0.1
-T 67200 53800 5 10 0 0 0 0 1
-slot=2
-T 67200 53800 5 10 0 0 0 0 1
-vendor_part_number=MCP6L92T-E/MSCT-ND
-T 67200 53800 5 10 0 0 0 0 1
-vendor=digikey
-T 67200 53800 5 10 0 0 0 0 1
-footprint=MSOP8
-T 67200 53800 5 10 0 1 0 0 1
-loadstatus=smt
+T 86100 57300 5 10 1 1 0 0 1
+netname=reset_n
 }
-N 65700 53800 65300 53800 4
-N 67200 54000 66700 54000 4
-N 65700 54200 65600 54200 4
-N 65600 54200 65600 55000 4
-N 65600 55000 67100 55000 4
-N 67100 55000 67100 54400 4
-N 67100 54400 67200 54400 4
-C 66800 53000 1 180 0 resistor.sym
+N 87400 56800 85500 56800 4
 {
-T 66500 52600 5 10 0 0 180 0 1
-device=RESISTOR
-T 66800 53000 5 10 0 1 180 0 1
-footprint=0402
-T 66800 53000 5 10 0 1 180 0 1
-loadstatus=smt
-T 66800 53000 5 10 0 1 180 0 1
-vendor=digikey
-T 65900 52600 5 10 1 1 0 0 1
-refdes=R73
-T 66400 52600 5 10 1 1 0 0 1
-value=1M
-T 66800 53000 5 10 0 1 0 0 1
-vendor_part_number=P1.00MLCT-ND
+T 86100 56900 5 10 1 1 0 0 1
+netname=swdio
 }
-N 65900 52900 65500 52900 4
-N 65500 52900 65500 53800 4
-N 66800 52900 67100 52900 4
-N 67100 52900 67100 54000 4
-C 66100 53300 1 0 0 gnd.sym
-C 67600 53500 1 0 0 gnd.sym
-C 66300 55600 1 180 0 resistor.sym
+N 87400 56400 85100 56400 4
 {
-T 66000 55200 5 10 0 0 180 0 1
-device=RESISTOR
-T 66300 55600 5 10 0 1 180 0 1
-footprint=0402
-T 66300 55600 5 10 0 1 180 0 1
-loadstatus=smt
-T 66300 55600 5 10 0 1 180 0 1
-vendor=digikey
-T 65400 55200 5 10 1 1 0 0 1
-refdes=R74
-T 65900 55200 5 10 1 1 0 0 1
-value=1M
-T 66300 55600 5 10 0 0 0 0 1
-vendor_part_number=P1.00MLCT-ND
+T 86100 56500 5 10 1 1 0 0 1
+netname=swclk
 }
-C 67400 55600 1 180 0 resistor.sym
+C 73800 66100 1 0 0 nc-left.sym
 {
-T 67100 55200 5 10 0 0 180 0 1
-device=RESISTOR
-T 67400 55600 5 10 0 1 180 0 1
-footprint=0402
-T 67400 55600 5 10 0 1 180 0 1
-loadstatus=smt
-T 67400 55600 5 10 0 1 180 0 1
-vendor=digikey
-T 66500 55200 5 10 1 1 0 0 1
-refdes=R75
-T 67000 55200 5 10 1 1 0 0 1
-value=1M
-T 67400 55600 5 10 0 1 0 0 1
-vendor_part_number=P1.00MLCT-ND
+T 73800 66500 5 10 0 0 0 0 1
+value=NoConnection
+T 73800 66900 5 10 0 0 0 0 1
+device=DRC_Directive
 }
-N 66300 55500 66500 55500 4
-N 66400 55000 66400 55500 4
-C 67300 55200 1 0 0 gnd.sym
-C 65200 55500 1 0 0 3.3V-plus.sym
-C 66000 54400 1 0 0 3.3V-plus.sym
-C 67500 54600 1 0 0 3.3V-plus.sym
-N 68700 57700 69600 57700 4
-N 69600 57700 69600 54200 4
-N 69600 54200 68200 54200 4
+C 73800 65500 1 0 0 nc-left.sym
 {
-T 68500 54300 5 10 1 1 0 0 1
-netname=randombits
+T 73800 65900 5 10 0 0 0 0 1
+value=NoConnection
+T 73800 66300 5 10 0 0 0 0 1
+device=DRC_Directive
 }
-N 70000 58100 68700 58100 4
+C 73800 64300 1 0 0 nc-left.sym
 {
-T 70000 58350 5 10 1 1 180 0 1
-netname=led_green
+T 73800 64700 5 10 0 0 0 0 1
+value=NoConnection
+T 73800 65100 5 10 0 0 0 0 1
+device=DRC_Directive
 }
-C 68700 64800 1 0 0 nc-right.sym
+C 73800 63100 1 0 0 nc-left.sym
 {
-T 68800 65300 5 10 0 0 0 0 1
+T 73800 63500 5 10 0 0 0 0 1
 value=NoConnection
-T 68800 65500 5 10 0 0 0 0 1
+T 73800 63900 5 10 0 0 0 0 1
 device=DRC_Directive
 }
-C 68700 64400 1 0 0 nc-right.sym
+C 73800 62500 1 0 0 nc-left.sym
 {
-T 68800 64900 5 10 0 0 0 0 1
+T 73800 62900 5 10 0 0 0 0 1
 value=NoConnection
-T 68800 65100 5 10 0 0 0 0 1
+T 73800 63300 5 10 0 0 0 0 1
 device=DRC_Directive
 }
-C 68700 63600 1 0 0 nc-right.sym
+C 73800 61900 1 0 0 nc-left.sym
 {
-T 68800 64100 5 10 0 0 0 0 1
+T 73800 62300 5 10 0 0 0 0 1
 value=NoConnection
-T 68800 64300 5 10 0 0 0 0 1
+T 73800 62700 5 10 0 0 0 0 1
 device=DRC_Directive
 }
-T 61100 51800 9 10 1 0 0 0 5
-select R71 for at least 8uA,
-less current -> more noise
-
-select R72 for Q1 collector
-voltage near 1.65V (VCC/2)
+C 84500 65800 1 0 0 nc-right.sym
+{
+T 84600 66300 5 10 0 0 0 0 1
+value=NoConnection
+T 84600 66500 5 10 0 0 0 0 1
+device=DRC_Directive
+}
+C 84500 64000 1 0 0 nc-right.sym
+{
+T 84600 64500 5 10 0 0 0 0 1
+value=NoConnection
+T 84600 64700 5 10 0 0 0 0 1
+device=DRC_Directive
+}
+C 84500 63400 1 0 0 nc-right.sym
+{
+T 84600 63900 5 10 0 0 0 0 1
+value=NoConnection
+T 84600 64100 5 10 0 0 0 0 1
+device=DRC_Directive
+}
+C 84500 62200 1 0 0 nc-right.sym
+{
+T 84600 62700 5 10 0 0 0 0 1
+value=NoConnection
+T 84600 62900 5 10 0 0 0 0 1
+device=DRC_Directive
+}
+C 84500 61600 1 0 0 nc-right.sym
+{
+T 84600 62100 5 10 0 0 0 0 1
+value=NoConnection
+T 84600 62300 5 10 0 0 0 0 1
+device=DRC_Directive
+}
+C 84500 61000 1 0 0 nc-right.sym
+{
+T 84600 61500 5 10 0 0 0 0 1
+value=NoConnection
+T 84600 61700 5 10 0 0 0 0 1
+device=DRC_Directive
+}
+C 84500 60400 1 0 0 nc-right.sym
+{
+T 84600 60900 5 10 0 0 0 0 1
+value=NoConnection
+T 84600 61100 5 10 0 0 0 0 1
+device=DRC_Directive
+}
+C 84500 57500 1 0 0 nc-right.sym
+{
+T 84600 58000 5 10 0 0 0 0 1
+value=NoConnection
+T 84600 58200 5 10 0 0 0 0 1
+device=DRC_Directive
+}
+C 80400 68500 1 0 0 nc-top.sym
+{
+T 80800 69000 5 10 0 0 0 0 1
+value=NoConnection
+T 80800 69200 5 10 0 0 0 0 1
+device=DRC_Directive
+}
+C 80800 68500 1 0 0 nc-top.sym
+{
+T 81200 69000 5 10 0 0 0 0 1
+value=NoConnection
+T 81200 69200 5 10 0 0 0 0 1
+device=DRC_Directive
+}
+N 58800 66500 58800 65900 4
+C 58600 62800 1 270 0 capacitor.sym
+{
+T 59300 62600 5 10 0 0 270 0 1
+device=CAPACITOR
+T 59500 62600 5 10 0 0 270 0 1
+symversion=0.1
+T 58900 62500 5 10 1 1 0 0 1
+refdes=C2
+T 58900 62100 5 10 1 1 0 0 1
+value=1uF
+T 58600 62800 5 10 0 1 0 0 1
+footprint=0402
+}
+C 58600 63700 1 0 0 3.3V-plus.sym
+C 58700 61600 1 0 0 gnd.sym
+C 58700 63700 1 270 0 inductor.sym
+{
+T 59200 63500 5 10 0 0 270 0 1
+device=INDUCTOR
+T 59400 63500 5 10 0 0 270 0 1
+symversion=0.1
+T 58700 63700 5 10 0 1 270 0 1
+footprint=0402
+T 58700 63700 5 10 0 1 270 0 1
+vendor=digikey
+T 58700 63700 5 10 0 1 270 0 1
+vendor_part_number=240-2554-1-ND
+T 58700 63700 5 10 0 1 270 0 1
+loadstatus=smt
+T 59000 63400 5 10 1 1 0 0 1
+refdes=L2
+T 59000 63000 5 10 1 1 0 0 1
+value=bead
+}
+N 58800 62800 67400 62800 4
+N 61000 62800 61000 61200 4
+N 60000 61200 60000 62800 4
+N 64100 60700 64100 62800 4
+N 67400 62800 67400 60900 4
+N 64800 61800 63500 61800 4
+C 65400 66200 1 180 0 npn.sym
+{
+T 64800 65700 5 10 0 0 180 0 1
+device=NPN_TRANSISTOR
+T 65400 66200 5 10 0 1 180 0 1
+footprint=SOT23
+T 65400 66200 5 10 0 1 180 0 1
+loadstatus=smt
+T 65400 66200 5 10 0 1 180 0 1
+vendor_part_number=MMBT3904-FDICT-ND
+T 65400 66200 5 10 0 1 180 0 1
+vendor=digikey
+T 64600 65700 5 10 1 1 0 0 1
+refdes=Q1
+T 63900 65500 5 10 1 1 0 0 1
+value=MMBT3904
+}
+C 65600 65200 1 0 0 npn.sym
+{
+T 66200 65700 5 10 0 0 0 0 1
+device=NPN_TRANSISTOR
+T 65600 65200 5 10 0 1 0 0 1
+footprint=SOT23
+T 65600 65200 5 10 0 1 0 0 1
+loadstatus=smt
+T 65600 65200 5 10 0 1 0 0 1
+vendor_part_number=MMBT3904-FDICT-ND
+T 65600 65200 5 10 0 1 0 0 1
+vendor=digikey
+T 66200 65700 5 10 1 1 0 0 1
+refdes=Q2
+T 66200 65500 5 10 1 1 0 0 1
+value=MMBT3904
+}
+C 67600 66000 1 0 0 npn.sym
+{
+T 68200 66500 5 10 0 0 0 0 1
+device=NPN_TRANSISTOR
+T 67600 66000 5 10 0 1 0 0 1
+footprint=SOT23
+T 67600 66000 5 10 0 1 0 0 1
+loadstatus=smt
+T 67600 66000 5 10 0 1 0 0 1
+vendor_part_number=MMBT3904-FDICT-ND
+T 67600 66000 5 10 0 1 0 0 1
+vendor=digikey
+T 68200 66500 5 10 1 1 0 0 1
+refdes=Q4
+T 68200 66300 5 10 1 1 0 0 1
+value=MMBT3904
+}
-- 
2.30.2