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.

Zero Crossing Detector LM393 (CB4483E)
The circuit presented is from the 1993 Motorola Linear Interface ICs. Other operational may be...
ADP1765 Linear Regulators CMOS - Analog Devices
September 2017 - Analog Devices is making available through Mouser Electronics the Analog Devices...
4-channel mixer (CB8756E)
Found in a 90s Elektor, this mixer makes use of integrated circuits of the time. The supply must be...