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Voltage converter using 555 timer circuit

Using a 555 timer circuit and some other electronic components can be made a small voltage converter that provides a negative voltage of 12 V at a rate of a few milliamps. 555 circuit is connected as astabil frequency of 125 kHz. Network C1-C5-D2-D3 form a cascade circuit which provides a negative DC voltage. Since in the scheme was not used either a transformer or inductor, converter efficiency is not very high: up to 16% at a current of 20 mA output.

Circuit Diagram: 
Voltage converter using 555 timer circuit

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