4-band microammeter (CB8210E)

Found in a 90s Radio Electronics this circuit requires precision resistors in the dividing network. The font must be symmetrical.

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Tone Control Mixer (CB4918E)
The integrated circuit used in this 80's mixer is the LM301A. However the circuit can be used to...
1 kHz Wien Bridge Oscillator (CB13442E)
We found this circuit in a Motorola documentation from 1978. The circuit is based on the LM324...
Projector control (CB8299E)
This old slide projector control circuit was found in an 80s Hands On. The circuit uses modern...