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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Triac Motor Control (CB1312E)
This circuit has some differences from the conventional types of control in which the delay in the...
Sound Operated Switch (CB6315E)
This sound relay or Vox was found in 70s RCA documentation. SCRs can be common types today and...
Incandescent lamp remote control (CB5271E)
This remote control for resistive loads using a triac appears elsewhere on this site. The circuit...