This circuit is from a 60's documentation. The capacitance C1 can be between 20 pF and 0.01 uF depending on the generated frequency. Equivalent transistors may be employed.
This power control for the AC power line uses a Triac and an Unijunction Transistor. The control...
This circuit produces modulated tones in a loudspeaker. The effects can be adjusted by the...
The SCR sector of this circuit can be powered by high voltage AC and instead of the LEDs we can...