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Old 5th December 2010, 01:36 AM   #1
Jay is offline Jay  Indonesia
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Default High power single supply amplifier?

Why is it not common to see high power amplifier with single ended power supply? I have a big transformer (around 7A) with 14Vac or about 20Vdc that I want to use for as highest wattage amplifier as possible. The front end can be driven with higher rail voltage if necessary. Is there such amplifier design somewhere?

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Old 5th December 2010, 01:48 AM   #2
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Default +/- Rails...

An amplifier running from a single-ended supply must use an output coupling capacitor because the output must be at 1/2 Vcc for the amp to operate in a linear fashion. Dual amps get to run the output at 0 V and, naturally, have no need for an output coupling capacitor. Capacitors can limit low frequency response and electrolytic capacitors can cause distortion by non-symmetry leakage/impedance issues.
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Old 5th December 2010, 01:51 AM   #3
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I've got a 52V 2kW SMPS that is also waiting for such a thing...
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Old 5th December 2010, 02:00 AM   #4
godfrey is offline godfrey  South Africa
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You could use a bridged amp to get higher power from a single supply, or make a dual supply with your transformer as shown below.
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Old 5th December 2010, 02:10 AM   #5
Jay is offline Jay  Indonesia
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Quote:
Originally Posted by godfrey View Post
You could use a bridged amp to get higher power from a single supply, or make a dual supply with your transformer as shown below.
Multiplier! That's a good idea, thanks. I will use the 20V-0-20V for Quasi NBIP using 4x or 6x 2N3773 per channel. I don't know how much wattage it would be...
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Old 5th December 2010, 03:12 AM   #6
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Quote:
Originally Posted by Jay View Post
Why is it not common to see high power amplifier with single ended power supply? I have a big transformer (around 7A) with 14Vac or about 20Vdc that I want to use for as highest wattage amplifier as possible. The front end can be driven with higher rail voltage if necessary. Is there such amplifier design somewhere?
Yup, right here: Zeus Amp

That'll get around the need for a dual, +/- supply.

Quote:
Multiplier! That's a good idea, thanks. I will use the 20V-0-20V for Quasi NBIP using 4x or 6x 2N3773 per channel.
It's not a multiplier. It's two back-to-back half wave rectifiers running off the same xfmr. You're looking at a whole essssssss-load of problems: DC core magnetization, and making the filtering job twice as hard as it would be with full wave rectification.
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Old 5th December 2010, 02:41 PM   #7
C3PO is offline C3PO  Philippines
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this is a single supply amp running at single 80volts dc, putting 300 watts per channel at 8 ohms, direct coupled, no output capacitor, why not give it a try?
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