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.

Humidity detector (CB19937E)
The LM3909 tone generator integrated circuit of this application is uncommon nowadays. The circuit...
Receiver TDA7000 (CB15974E)
The TDA7000 is a Philips integrated circuit that contains a complete FM receiver with the need for...
Current Regulator (CB15999E)
This circuit is based on an LM123 and can supply output currents up to 3A. IB is typically 3.5A...