Hi Today Instructable is very simple and easy to build DIY Voltage Doubler CircuitA Complete Step By Step Video Tutorial is also given in the video below.

Voltage doubler is the circuit where we get the twice of the input voltage, like if we supply 5v voltage, we will get 10 volt at the output. Generally transformers are there to step-up or step-down the voltage, but sometimes transformers are not feasible because of their size and cost. So here is the quick, easy and practical solution to double the voltage, using 555 timer IC