Unijunction metronome

  
The UJT-oscillator frequency is determined by the 100 µ¥ capacitor and the effective resistance of the 22 and 470 resistors and the potentiometer. Rate can be varied from 42 to 208 beats/minute.
Unijunction metronome - schematic

The circuit should be housed in an insulated box for safety, or use ground (3-wire cord).




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