Joule Thief Circuit With Capacitor. The joule thief circuit extracts almost all energy from a standard single cell. Joule thief circuit is an oscillatory voltage booster which can boost small amount of voltage around 1v or less to a usable voltage to drive small loads like leds.
This voltage is produced by simple half wave schottky diode rectifier with capacitive filter the 3 3 uf 350v capacitor. The drain terminal of this switch connects to the base of the joule thief oscillator transistor. In this project i will show you how i created a very popular and easy to build circuit the joule thief in order to power leds with voltages from 0 5v to 2 5v.
After start up the supply voltage increases with the time.
It can use nearly all of the energy in a single cell electric battery even far below the voltage where other circuits consider the battery fully discharged. The principle of work of the control circuit is following. The drain terminal of this switch connects to the base of the joule thief oscillator transistor. This voltage is produced by simple half wave schottky diode rectifier with capacitive filter the 3 3 uf 350v capacitor.
