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Old 31st March 2011, 10:57 PM   #1
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Default 100W chip amp using massive parallelization

Okay I know how this sounds but what'd be the drawbacks/advantages to making a single 100W amp by paralleling 20 or so simple op-amp amplifier circuits?
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Old 31st March 2011, 11:10 PM   #2
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which opamps?
It would take a whole lot more than 20 regular dual opamp chips to get 100 watts. jer
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Old 31st March 2011, 11:11 PM   #3
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It's been done. Not to 100W, but...

Doug Selfs NE5532 Power Amp. Thoughts anyone !

w
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Old 31st March 2011, 11:39 PM   #4
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I looked thru the thread but I couldn't really find much about how the thing sounded. Did I miss that?
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Old 31st March 2011, 11:45 PM   #5
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Another way to do it is operate several credit cards in parallel and buy one of the big Apex chip amps.

Conrad
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Old 31st March 2011, 11:56 PM   #6
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For a 100w amp you would need something like a + & - 50v power supply. Opamps
that can operate at those voltages are hard to find and pretty darn expensive.
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Old 1st April 2011, 01:55 AM   #7
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Quote:
Originally Posted by cuallito View Post
I looked thru the thread but I couldn't really find much about how the thing sounded. Did I miss that?
There are a couple of other threads on the subject but I haven't been able to find them using the search facility. I don't recall anyone actually having heard one, but the measurements were extremely clean.

w
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Old 1st April 2011, 03:34 AM   #8
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Quote:
Originally Posted by woody View Post
For a 100w amp you would need something like a + & - 50v power supply. Opamps
that can operate at those voltages are hard to find and pretty darn expensive.
well that would depend on the load impedance, now wouldn't it, woody?

-Charlie
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Old 1st April 2011, 10:58 AM   #9
AndrewT is offline AndrewT  Scotland
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The highest common/cheap opamp voltage supply is 42V (=+-21Vdc).

This will allow maximum output voltage of ~ 18Vpk into a load.
Now parallel sufficient opamps to deliver the peak current that a speaker could demand from 18Vpk transients.
8ohms could be ~220 30mA opamps giving an effective output power of ~ 20W into 8r0.

Speakers seem to be a non starter. Medium or high impedance headphones would be a more suitable load.

Oh, before you ask you could bridge your opamp amplifiers for ~80W into 8r0 but this would require ~ 900 opamps each capable of delivering undistorted 30mApk (not the short circuit limit)
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Last edited by AndrewT; 1st April 2011 at 11:01 AM.
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Old 1st April 2011, 08:48 PM   #10
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Quote:
Originally Posted by cuallito View Post
Okay I know how this sounds but what'd be the drawbacks/advantages to making a single 100W amp by paralleling 20 or so simple op-amp amplifier circuits?
As advantage i realy can't think of anything... At least keeping in mind the amount of op-amps you would need.
load sharing will more than probably not going to be equal so you can run into -more or less- n-1 problems, where n is the number of opamps You need to use.

Maybe if You need to, You might find a decent opamp that has enough current capacity and output voltage to paralell a quad opamp for a headphone.
or drive a piezzo tweeter (whatever is benefical in that, but who em i to know.. realy)

Actualy if You ask me, for those power levels it may not be usefull at all.
You might be better of just adding output transistors on some high supply/output voltage opamp. Not a clever solution but who knows, might actualy work out well.
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