Single Crystal Filter (CB6542E)

High selectivity filters can be obtained by combining same frequency crystals in series as shown in the circuit.

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Selective Light Amplifier (CB25488E)
This IR light sensor circuit was found in the July 1992 issue of Radio Electronics magazine. It is...
Universal Motor Control (CB5421E)
Alongside the diagram of this control, which we find in a 1980s documentation are the component...
Tape equalizer (CB7308E)
This circuit was found in an American documentation from 1968. The configuration can be adapted to...