Sawtooth generator (CB21338E)

This op amp circuit is based on a 555 IC and two common op amps. Transistors are general purpose.

Current shunt amplifier (CB6791E)
Found in a Maxim documentation from the 1990s, this current-sensing amplifier uses components from the...
Integrated Intercom (CB16336E)
We found this circuit in a 1982 documentation. An intercom to be good must be sensitive and have...
Voltage Controlled Gain Amplifier (CB4900E)
This circuit is from a 1980s documentation, but the configuration can be applied to most modern...