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Unijunction metronome

2017-09-09 16:36  
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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

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

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