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Old 6th June 2006, 02:47 PM   #11
kalmara is offline kalmara  Bulgaria
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Hello, I saw this topic searching for something easy to build for unpretentious clients, so I don't lose my time in building good schematics for not so good listeners, so I decided to edit a little bit this easy circuit for some extra output power...
I would like it, if You people answer me some questions.
1. The 3k/2W resistors are calculated for 15mA current for the opamp is this enough ?
2.What output power will I get if I use my edited schematic on higher voltage than +/-45V with the MJ15003
3.What output power will I get with 2SC5200 on +/-35V and on +/-45V ? ? ?

I wait for your comments and recommodations...
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File Type: gif simple power amplifier (edited strawa-50w).gif (4.7 KB, 296 views)
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Old 6th June 2006, 07:57 PM   #12
MikeB is offline MikeB  Germany
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This will not increase a single watt as the voltageswing is determined by the opamp... Don't use fast trasistors with that simple circuits, it might bite you with oscillations.

If you need it simple and powerful go for a bootstrapped topology, similar to the p3a...

Or see attachment... (have not build that) You can use the sc5200/sa1943 as output.

Mike
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Old 7th June 2006, 02:47 PM   #13
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by kalmara

Hello, I saw this topic searching for something easy to build for
unpretentious clients, so I don't lose my time in building good
schematics for not so good listeners, .....................................

I wait for your comments and recommodations...

http://sound.westhost.com/project19.htm

Simple, easy, 50W and almost completely idiot proof.

also see :

http://sound.westhost.com/project76.htm

/sreten.
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Old 7th June 2006, 06:39 PM   #14
AKN is online now AKN  Sweden
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Hi!

Can only agree with all negative posts on the first suggested amplifier and the "improved" variant . Will be very unlinear before feedback leaving lots of correction job to opamp.
There are so many much better amps as already suggested in this thread, and they will sound much better.

Anders
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