This simple electronic music box circuit was found in the April 1985 issue of Radio Electronics. The components are common, and the note adjustments are made with trimpots.
According to its author, this device indicates the amount of force applied to the sensors. The...
This low frequency doubler requires a 50 mV signal at the input. The circuit is from an old...
This is a circuit that should not be used for readers interested in a fair game. The circuit...