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1 khz oscillator

2016-08-18 15:56  
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This circuit operates as an oscillator and a timer. The 2N6028 is normally on due to excess holding current through the 100 k resistor. When the switch is momentarily closed, the 10 ?μ?¥ capacitor is charged to a full 15 volts and 2N2926 starts oscillating (1.8 and 820 pF).
1 khz oscillator

The circuit latches when 2N2926 zener breaks down again.

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