Power supply fix

Add diode between 12V supply and the LDO. Increase the LDO input cap
to 22uF.

This makes the board work with a long power cable to a 12V lead acid
battery, keeping the CPU alive while firing igniters

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/telefire.pcb b/telefire.pcb
index d017b9e829e2bbc24ca5b4d2283bb0232b7e5c36..a688c083f2a08b815f53fc36fb16eb925042904b 100644 (file)
--- a/telefire.pcb
+++ b/telefire.pcb
@@ -9,7 +9,7 @@ Grid[100.000000 0.0000 0.0000 0]
 PolyArea[200000000.000000]
 Thermal[0.500000]
 DRC[5.00mil 10.00mil 5.00mil 5.00mil 15.00mil 7.00mil]
-Flags("showdrc,nameonpcb,clearnew,snappin")
+Flags("showdrc,nameonpcb,clearnew,snappin,orthomove")
 Groups("1,c:2,s:3")
 Styles["Signal,10.00mil,29.00mil,15.00mil,10.00mil:Power,25.00mil,60.00mil,35.00mil,10.00mil:Fat,25.00mil,60.00mil,35.00mil,10.00mil:Skinny,6.00mil,24.02mil,11.81mil,6.00mil"]
 
@@ -2786,7 +2786,7 @@ Layer(2 "bottom")
        (
                [3277.00mil 3939.00mil] [3606.00mil 3939.00mil] [3606.00mil 3432.00mil] [3277.00mil 3432.00mil] 
        )
-       Polygon("clearpoly")
+       Polygon("clearpoly,lock")
        (
                [20.00mil 10.00mil] [4000.00mil 10.00mil] [4000.00mil 3990.00mil] [20.00mil 3990.00mil] 
        )
@@ -2823,10 +2823,9 @@ Layer(5 "silk")
        Text[2464.00mil 1720.00mil 0 100 "C2" "clearline"]
        Text[2464.00mil 1820.00mil 0 100 "C3" "clearline"]
        Text[2464.00mil 1920.00mil 0 100 "C4" "clearline"]
-       Text[2464.00mil 2020.00mil 0 100 "RX" "clearline"]
-       Text[2464.00mil 2120.00mil 0 100 "TX" "clearline"]
-       Text[2417.00mil 2220.00mil 0 100 "Arm" "clearline"]
-       Text[2359.00mil 2320.00mil 0 100 "Power" "clearline"]
+       Text[2353.00mil 2220.00mil 0 100 "Amber" "clearline"]
+       Text[2368.00mil 2320.00mil 0 100 "Green" "clearline"]
+       Text[2432.00mil 2120.00mil 0 100 "Red" "clearline"]
        Polygon("clearpoly")
        (
                [3780.00mil 840.00mil] [3982.00mil 840.00mil] [3982.00mil 1232.00mil] [3780.00mil 1232.00mil] 

diff --git a/telefire.sch b/telefire.sch
index e43478967e426f70c6fa583cbb5ebe6570b9ccd0..f5d4262ec31348d5ba60350c4fa5e8d2ce93b501 100644 (file)
--- a/telefire.sch
+++ b/telefire.sch
@@ -34,9 +34,9 @@ refdes=C5
 T 43200 55200 5 10 0 0 90 0 1
 symversion=0.1
 T 44000 55100 5 10 1 1 0 0 1
-value=1uF
+value=22uF
 T 44100 55000 5 10 0 0 0 0 1
-vendor_part_number=311-1358-1-ND
+vendor_part_number=1276-3047-1-ND
 T 44100 55000 5 10 0 0 0 0 1
 footprint=0805
 T 44100 55000 5 10 0 0 0 0 1
@@ -2837,3 +2837,14 @@ loadstatus=noload
 T 57800 61500 5 10 0 0 0 0 1
 graphical=1
 }
+C 41800 58000 1 0 0 diode.sym
+{
+T 42200 58600 5 10 0 0 0 0 1
+device=DIODE
+T 42100 58500 5 10 1 1 0 0 1
+refdes=D9
+}
+N 42700 58200 43700 58200 4
+N 43700 58200 43700 56300 4
+N 41800 58200 41200 58200 4
+N 41200 58200 41200 55900 4