Discription
Source - http://www.bowdenshobbycircuits.info/page4.htm#triple.gif
The circuit below is a DC to DC converter using a standard 12 VAC center
tapped power transformer wired as a blocking oscillator. The circuit is
not very efficient but will produce a high voltage usable for low power
applications. The input battery voltage is raised by a factor of 10
across the transformer and further raised by a voltage tripler
consisting of three capacitors and diodes connected to the high voltage
side of the transformer. The circuit draws about 40 milliamps and should
operate for about 200 hours on a couple of 'D' alkaline batteries.
Higher voltages can be obtained by reducing the 4.7K bias resistor.
Circuit Diagram
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