Single power supply change into dual power supply circuit

Published:2011/5/3 6:19:00 Author:Christina | Keyword: Single power supply, dual power supply | From:SeekIC

In the circuit, time base circuit 555 connected as an astable circuit (pin-3's output frequency is 20 KHz, duty cycle is 1:1). When the pin-3 is high level voltage, C4 is charged by the electric current; when the pin-3 is low level voltage, C3 is charged by the electric current. Because of the presence of VD1, VD2, the C3, C4 can be charged by the current, but can not be discharged, the maximum charge value is EC, if you connect the B to ground, you will get the +/-EC dual power at both ends of A, C. This circuit's output current is more than 50 mA.



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