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555 Power Supply Circuit that Changes from Single-supply to

2015-02-01 04:21  
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555 Power Supply Circuit that Changes from Single-supply to Dual-supply
As shown in the figure3-8, the astable multi-vibrator consists of a 555, R1 and C2and its oscillation frequency is about 20kHz. As both the charge and discharge time constant are R1C2, the duty cycle is 50%. After the 20kHz pulse wave output have been filtered by D1, C3 and D2, C4 respectively, dual power supply ±EDDis output. The application of dual time base helps load current to reach 50mAeven more.