Overvoltage Indicator (CB22007E)

Using a CA3130 operational amplifier, this circuit drives an LED when the voltage exceeds the value set in VR1.

RF Pulse Generator (CB4132E)
This high frequency pulse generator was found in an old American documentation. The circuit makes use...
Amplifier MC14546 (CB20041E)
This small 1 W amplifier uses a Motorola integrated circuit from the 1970s. The integrated circuit...
Triac Heating control (CB21372E)
We found this circuit in a 1966 RCA manual. The integrated circuit is unusual, and the Triac must...