Despite being transistorized, this is a constant current source circuit for 1 V valve filaments such as the 1H4 tube.
This capacitor leak detector was found at Popular Electronics in June 1991. The magazine no longer...
This Ditherizing circuit is used in digital audio for effect production. The circuit is from a...
At each touch of the sensor this counter based on circuit 4017 advances one LED. The circuit can be...