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I need a diy solution to boost 6V DC to 12V DC @850 mA Answered

I have torroids from pc power supply units, loads of transistors, 555s, uControllers, diodes, caps... all sorts of stuff.

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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.