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555 Astable oscillator

2015-01-28 11:21  
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This free-running multivibrator uses an external current sink to discharge the timing capacitor, C. Therefore, interval ^ may easily be 1000 the pulse duration, t1( which defines a positive output. Capacitor voltage, V^, is a negative going ramp with exponential rise during the pulse output periods.
555 Astable oscillator

This as is has low duty cycle.

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