Portable High Voltage Supply

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Get +12V and +200V from a 6V “gel-cell” (sealed lead acid) battery. You MUST use an MC34074 quad op-amp, for this to work ! Parts like the LM324, LF347 or TL084, will NOT work. The LM324 is too slow. The MC34074 can swing all the way to ground, like the LM324, but its as fast as the LF347 and TL084. The LF347 and TL084 can not swing all the way to ground.

There’s this thing “specmanship” when it comes to datasheets. Op-amps have this thing called “gain-bandwidth-product”. That’s the frequency, where the op-amp’s gain is one (unity). Its a useless number. All the verbage in the first two paragraphs of most datasheets is useless, if not deceptive, marketing garbage. The real, useful data is after that, and needs someone with training and experience to properly make use of it. A LM324 may have a gain-bandwidth-product of 1MHz, but as a full-swing (rail-to-rail) oscillator, it can’t go much faster than 5KHz.
 

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