This is the small 12V inverter circuit. This inverter circuit could be utilized to power electric razors, stroboscopes and flash tubes, and small fluorescent lamps from a 12V vehicle battery. In contrast towards the usual feedback oscillator type of inverter, the oscillator of this small 12V inverter is separate from the output stage, which enables simple adjustment of the oscillator frequency to suit various applications.
The oscillator circuit consists of a 555 timer connected as an astable multivibrator. The inclusion of D1 would ensure that the duty-cycle of the squarewave output is maintained at about 50%. The output of the 555 drives the base of T1 which switches electric current via one half of the primary of the transformer. T2 is driven from the collector of Tl and thus switches electric current via the other half of the transformer winding on opposite half cycles of the drive waveform. Zener diodes D4 and D5 defend Tl and T2 from any high-voltage spikes generated by the transformer.
The voltage applied to the transformer primary is stepped up and the required high output voltage appears across the secondary winding. According to the application the secondary voltage may or may not be rectified.
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