Two-channel peak indicator (CB21975E)

This peak indicator for stereo amplifiers uses a CA3130. The 80's circuit does not need a symmetrical power supply.

Diode Stabilized Wien Oscillator (CB14906E)
We found this configuration in a Radio Electronics from 1989. The circuit can be designed with...
Locked relay shield (CB8837E)
This interesting configuration was found in a 1965s Electronic Design. It makes use of components of...
Sound Flash Trigger (CB5442E)
This circuit is from old American documentation intended to trigger the flash of a camera flash with...