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.

Astable with Transistors (CB12633E)
This circuit generates a rectangular signal whose frequency depends on the electrolytic...
Transistor Tester (CB11156E)
This simple tester for general purpose transistors was obtained in an Argentine publication from...
Indicator light (CB22085E)
This circuit is intended for calls to the deaf and is indicated in an old English documentation. LEDs can be...