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.

Sensitive Photo Relay CB13492E (CB13492E)
This circuit is from the documentation of Radio Shack 1975. It can be mounted with 12 V relays,...
Single Pulse Triggering with Triac (CB24899E)
Using an optocoupler this circuit turns on the light in a bedroom for a set amount of time when...
Remote current reader (CB8985E)
This circuit is used for remote current monitoring. In the original version of the 80s a lamp is...