Baxandall tone control (CB9372E)

Found in RCA documentation from the 90s, this bass and treble control uses an operational amplifier from the time that can still be found today.

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Water Level Alarm (CB5313E)
This circuit produces a loud sound in the speaker when water level reaches the sensor. The power...
1092 LED panel indicators (COM001E)
May 2016 - It can be obtained from Mouser Electronics new display 1092 from VDC. The new LED...
Two transistor assisted ignition (CB6391E)
This Motorola circuit is from 1965. Collector currents must be 7 and 12 A for transistors....