I cleaned up the design a bit:
Here are the board designs:
Top
Bottom
Top Copper Only
Bottom Copper Only
This is curious. There seems to be a birdy right at 0.8 seconds. I investigated a little, and it looks to be real. This will produce a little flicker just before 1 second is elapsed, but I don't think that will be a show-stopper:
That's a neat idea. Just a few years later than that I was asked to design a power supply for a superconducting solenoid. It had to provide 0 - 1000 amperes at 0.0 - 0.75 VDC reproducible to within 0.001 ampere over a minim um time frame of 6 months. It had to be able to ramp the current over a pe riod of as much as 2 weeks. I used an LF356 with an oil-filled capacitor t hat cost $200 - in 1980 dollars, mind you - to create the ramps.
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