555 Power Supply Circuit that Changes from Single-supply to Dual-supply

Published:2011/7/5 0:11:00 Author:Zoey | Keyword: 555 Power Supply Circuit, Single-supply, Dual-supply | From:SeekIC

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.



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