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Voltage increaser

Voltage increaser
The circuit produces high voltage pulses (spikes) of about 40v p-p (when the LED is not
connected), at a frequency of 200kHz. The super-bright LED on the output absorbs the
pulses and uses the energy to produce illumination. The voltage across the LED will be
about 3.6v
The winding to the base is connected so that it turns the transistor ON harder until it is
saturated. At this point the flux cannot increase any more and the transistor starts to
turn off. The collapsing magnetic field in the transformer produces a very high voltage
and that's why we say the transformer operates in FLYBACK mode.
This type of circuit will operate from 10kHz to a few MHz.         
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