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You can try to wind your own single transformer or buy two 12v center tapped one amp utility XFMRs.
The TIP35c has a minimum gain of 25 at 2 amps and cost $1.49 each at
But what you need is a boost converter. Keep in mind the 6V DC needs to be able to output 2A or more in order to offer enough power for the voltage to be boosted to 12V @ 850mA.
Just do a google search for a 6V to 12V boost converter schematic and you'll find what your looking for.
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Posted:Aug 28, 2014
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