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Keith Packard [Tue, 18 Dec 2012 06:55:22 +0000 (22:55 -0800)]
Update resistor values to match what works. Add LED.
Testing revealed that the phototransistor appears to need quite a bit
of current to get the rise time within reasonable limits. Change the
resistor feeding it to 680 ohms (from 3.3k). This also required
changing the op-amp bias voltage from 1/2VCC to 90% VCC. Swapping in a
1k resistor for the 10k there fixed that nicely.
Signed-off-by: Keith Packard <keithp@keithp.com>
Keith Packard [Fri, 14 Dec 2012 19:15:58 +0000 (11:15 -0800)]
Add outline
Signed-off-by: Keith Packard <keithp@keithp.com>
Keith Packard [Fri, 14 Dec 2012 06:09:13 +0000 (22:09 -0800)]
Add some silk to the back side
Signed-off-by: Keith Packard <keithp@keithp.com>
Keith Packard [Fri, 14 Dec 2012 06:01:40 +0000 (22:01 -0800)]
Finish the first version of the board
Signed-off-by: Keith Packard <keithp@keithp.com>
Keith Packard [Fri, 14 Dec 2012 02:37:30 +0000 (18:37 -0800)]
Import preliminary schematic
Signed-off-by: Keith Packard <keithp@keithp.com>
projects / hw / mpserial / log