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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Unijunction modulated oscillator (CB8653E)
This circuit can be found elsewhere on this site as part of alarms or sirens. The circuit given is...
Code Switch (CB1354E)
This 3-digit code switch was obtained from an old American documentation. The capacitor is 470 uF...
8-output phase shifter (CB8152E)
Found in a 1967 Electronic Design, this circuit changes the phase of a signal in 8 different ways, given...