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.
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DC to DC converter
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