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Keith Packard [Tue, 10 Feb 2015 07:15:47 +0000 (23:15 -0800)]
Use the available LQFP-32 package
This makes the board larger, and doesn't let it fit in the cute little
box, but uses a component we can actually get.
Signed-off-by: Keith Packard <keithp@keithp.com>
Keith Packard [Mon, 9 Feb 2015 17:17:49 +0000 (09:17 -0800)]
Fix STM32F042 part number to reflect desired package
Not that we can purchase this, but it is what fits...
Signed-off-by: Keith Packard <keithp@keithp.com>
Keith Packard [Mon, 2 Feb 2015 16:59:24 +0000 (17:59 +0100)]
Finish single source version
Replace components with smaller parts.
Fit into small New Age enclosure.
Connect 20V supply to v_usb.
Signed-off-by: Keith Packard <keithp@keithp.com>
Keith Packard [Fri, 30 Jan 2015 05:30:57 +0000 (06:30 +0100)]
Start work on single high-voltage source version
This removes the low-voltage noise source and micro match debug
connector to see if we can't fit it in the tiny USB dongle package
used for µPUSB v3.0.
Not quite there; the noise source has too many huge packages still
Signed-off-by: Keith Packard <keithp@keithp.com>
Keith Packard [Tue, 6 Jan 2015 04:37:34 +0000 (20:37 -0800)]
Use keithp-friendly muffin template
This sticks the refdes values in each label
Signed-off-by: Keith Packard <keithp@keithp.com>
Keith Packard [Tue, 6 Jan 2015 04:37:12 +0000 (20:37 -0800)]
Switch one MSOP8 pad from round to square
Cutting stencils requires square pads
Signed-off-by: Keith Packard <keithp@keithp.com>
Keith Packard [Fri, 26 Dec 2014 03:30:52 +0000 (19:30 -0800)]
Fix D2 goof-up. Adjust value silk positions
Oops. When sticking the silk text on the back, I must have rotated D2
accidentally, which puts the pads in the wrong location. I've moved
them back, but the first build is gonna be awkward.
Also moved all of the component value text around to make it usable.
Signed-off-by: Keith Packard <keithp@keithp.com>
Keith Packard [Fri, 26 Dec 2014 02:40:03 +0000 (18:40 -0800)]
Fix component values and DK parts numbers
Add DK part numbers for all of the passives. Fix some of the passive
component values so they're reasonable.
Signed-off-by: Keith Packard <keithp@keithp.com>
Keith Packard [Wed, 24 Dec 2014 11:08:54 +0000 (03:08 -0800)]
Add words to the back silk
Keith Packard [Wed, 24 Dec 2014 10:31:06 +0000 (02:31 -0800)]
Layout version with dual noise sources and STM32F042 processor
Signed-off-by: Keith Packard <keithp@keithp.com>
Keith Packard [Wed, 24 Dec 2014 08:07:54 +0000 (00:07 -0800)]
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>
Keith Packard [Wed, 24 Dec 2014 04:43:17 +0000 (20:43 -0800)]
Shuffle board part labels around to make them usable
Signed-off-by: Keith Packard <keithp@keithp.com>
Bdale Garbee [Mon, 24 Feb 2014 06:26:47 +0000 (23:26 -0700)]
add version number to the silk
Bdale Garbee [Mon, 24 Feb 2014 01:17:14 +0000 (18:17 -0700)]
op amps only need picoamps of bias, so use 1M resistors for the divider
Bdale Garbee [Mon, 24 Feb 2014 01:10:36 +0000 (18:10 -0700)]
select resistor values, update attributes
Bdale Garbee [Sun, 23 Feb 2014 23:43:26 +0000 (16:43 -0700)]
fixes from Keith's initial design review
Bdale Garbee [Sun, 23 Feb 2014 23:13:47 +0000 (16:13 -0700)]
update to use a miso pin for the random bits
Bdale Garbee [Sun, 23 Feb 2014 18:20:16 +0000 (11:20 -0700)]
initial design capture