Operational current source (CB8856E)

We found this circuit in a 70s EDN. The circuit makes use of operational of the time.

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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...