analog&RFmodels
Senior Member

a friend of mine used to produce and sell those 30-40 years ago. as i remember he used a pin diode optical sensor to detect a fast rising or falling edge as the bullet went over the traps. rising light from...

speaking of whisker growth - do your homework before your last cleaning of the board, some components of some cleansers/solvents that get left behind will actually accelerate whisker formation and i would also say do...