Triac Heating control (CB21372E)

We found this circuit in a 1966 RCA manual. The integrated circuit is unusual, and the Triac must match the load.

Audio Limiter (CB25429E)
We found this circuit in the January 1992 issue of Radio Electronics magazine. The circuit...
Error Amplifier and Trigger Generator (CB19981E)
This circuit was found in old documentation. The components can be replaced by modern ones. The...
Bridge Operational Amplifier 2 (CB15881E)
Using only one LM107 operational amplifier, National Semiconductor suggests the circuit in the...