Lap Timer

[wild03]

Originally posted by Steve
Nice instructions. That cassette tape project box is classic!

Thanks Steve, I wrote them in a rush yesterday and they might be a little hard to follow for someone not familiar with the project, I'll see If I can clean them up a little. If you noticed I ended up having to send 12V instead of 5V because the Voltage Regulator circuit I used has a initial 1.25v drop. So with 5 Vin I was getting 3.75Vout, and the lasers were a little dim. I used 12v and regulated down to 4.15 or so.
This simple circuit is really handy for projects because with a simgle power supply of 12V you can regulate all the way down to whatever you need by turning the variable resistor.