hw/chaoskey
4 years agoLayout version with dual noise sources and STM32F042 processor
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>
4 years agoAdd a 20V darlington source. Switch to STM32F042 (Schematic changes only)
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>
4 years agoShuffle board part labels around to make them usable
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>
5 years agoadd version number to the silk
Bdale Garbee [Mon, 24 Feb 2014 06:26:47 +0000 (23:26 -0700)]
add version number to the silk

5 years agoop amps only need picoamps of bias, so use 1M resistors for the divider
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

5 years agoselect resistor values, update attributes
Bdale Garbee [Mon, 24 Feb 2014 01:10:36 +0000 (18:10 -0700)]
select resistor values, update attributes

5 years agofixes from Keith's initial design review
Bdale Garbee [Sun, 23 Feb 2014 23:43:26 +0000 (16:43 -0700)]
fixes from Keith's initial design review

5 years agoupdate to use a miso pin for the random bits
Bdale Garbee [Sun, 23 Feb 2014 23:13:47 +0000 (16:13 -0700)]
update to use a miso pin for the random bits

5 years agoinitial design capture
Bdale Garbee [Sun, 23 Feb 2014 18:20:16 +0000 (11:20 -0700)]
initial design capture