Voltage Doubler using 555 Timer

This dc voltage doubler circuit produces a voltage that is about double its input voltage supply. This is useful when a higher voltage level is needed out of a single lower voltage power supply. 

The electronic circuit is a square wave generator using the LM555 timer IC. It is followed by a stage made of transistors Q1 and Q2. The actual doubler circuit is made of diode D1, D2 and Electrolytic Capacitor  C5 and C6.

The 555 timer IC works as an astable multivibrator and generates a frequency of about 8 kHz. 

you may use C3 0.01uF also, it will generate about 7kHz. if you want to use the input vltage up to 12 volt then the electrolytic capacitor raring should be 50V.

The square wave output drives the final stage made of Q1 and Q2. This is how the doubler works: by a low amplitude of the signal, transistor Q1 blocks while Q2 conducts. The minus electrode of the capacitor C5 is grounded and charges through D1. By a high amplitude of the signal, transistor Q1 conducts while Q2 blocks. However, capacitor C5 cannot discharge because it is blocked by D1. The following capacitor C6 is therefore charged with a combined voltage from C5 and the power supply.

To Download the Schematic and PCB layout click here . it is a double sided PCB layout. 

On standby, the circuit delivers around 20 volts. The maximum load must not exceed 100 mA. 

On lower current ratings, the voltage is higher.

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