Free (Almost) MachTach Machine Tachometer

[Hawkeye]

Now you've got me going, Ed. I have one on my bench that stopped working sometime after the fire. It lights up when powered. I just don't remember what the symptoms were. I'm already trying to troubleshoot the Arduino tach I made a few years ago. Might as well play with two at once. This one already has the TO-220 regulator bolted to the board. Ver. 2.3 6-25-11