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Old 29th June 2011, 06:11 PM   #11
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Mooly, I don't thinks he's picked up on the active grounds. The simple resistive virtual ground isn't really suited to high power use, not without using huge resistors and wasting an enormous amount of power.
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Old 29th June 2011, 06:22 PM   #12
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by Andy5112405 View Post
Mooly, I don't thinks he's picked up on the active grounds. The simple resistive virtual ground isn't really suited to high power use, not without using huge resistors and wasting an enormous amount of power.
Could be...
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Old 29th June 2011, 06:48 PM   #13
dgta is offline dgta  United States
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I did pick up on the active ground. Even if I expect a small-ish load imbalance, I would need at least a rail splitter like the TLE2426, which doesn't handle 80V, or a plain opamp DIY rail splitter, and I still need a high voltage opamp. And this is still a small ground current setup, unless I add a pass transistor.

With your (Andy's) circuit, the opamps don't pass any load current, ground or otherwise, so I can use just one rail of the supply for single-sided circuits, if needed, up to full regulator capability. All this for the price of 2 opamps instead of 1 plus a transistor and associated circuitry. Seems like a winner to me.
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