Single-supply variable dual power supply circuit composed of 555

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The time base circuit 555 is connected to an unsteady circuit, and the 3-pin output frequency is 20 kHz and the square wave has a duty ratio of 1:1. When pin 3 is high, C4 is charged; when low, C3 is charged. Due to the existence of VD1 and VD2, C3 and C4 are only charged and not discharged in the circuit. The maximum charging value is EC, and the B terminal is grounded. At both ends of A and C, the dual power supply of +/-EC is obtained. The output current of this circuit exceeds 50mA.

The output voltage of a single-supply dual-supply circuit is between plus and minus 3 to 15, but cannot exceed 15V.

In the circuit of the drawing, the time base circuit 555 is connected to an unsteady circuit, and the square pin has an output frequency of 20 kHz and a square wave with a duty ratio of 1:1. When pin 3 is high, C4 is charged; when low, C3 is charged. Due to the existence of VD1 and VD2, C3 and C4 are only charged and not discharged in the circuit. The maximum charging value is EC, and the B terminal is grounded. At both ends of A and C, the dual power supply of +/-EC is obtained. The output current of this circuit exceeds 50mA.

A brief introduction to 555:

The 555 is a versatile digital analog hybrid integrated circuit. It is convenient to construct a Schmidt Trigger, a Monostable Trigger and a Multivibrator. The 555 timer is widely used because of its flexibility and convenience.