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Need to knock a few volts off..!
Need to knock a few volts off..!
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Old 22nd September 2010, 04:49 PM   #11
Ar4 is offline Ar4  Latvia
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Need to knock a few volts off..!
OK, thanks Mooly. This one looks quite simple, unlike other circuits I've found.
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Old 22nd September 2010, 04:52 PM   #12
Mooly is offline Mooly  United Kingdom
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Need to knock a few volts off..!
It's an easy amp to build... I'm sure you'll be pleased with it.
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Old 23rd September 2010, 06:40 PM   #13
johnalexwarren is offline johnalexwarren  England
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I hope so - can't wait to hear it :O)
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Old 24th September 2010, 04:54 PM   #14
macboy is offline macboy  Canada
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Originally Posted by Mooly View Post
Macboys suggestion of a capacitance multiplier is interesting, and while achieving the reduction in voltage as far as the amp goes, it still needs the main reservoir caps to withstand the full output from the tranny. The heat "saved" from the outputs by the lower rail is still produced by the pass transistors in the multiplier.
Yes, a capacitor multiplier doesn't eliminate the need for sufficient reservoir caps. It does however reduce ripple by a significant factor. That is where the name comes from; the ripple voltage on the output is equivalent to using much large reservoir capacitors.

Good point about the heat too. You don't reduce heat overall, but you distribute the heat between the cap.mult. transistors and the amp output transistors. And you put the amp's output transistors into a safer operating point (VCE * IC), so that in theory you can pull more current through them without damage.
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