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viki 16th October 2004 02:02 PM

100W Amplifier Shematic and PCB
I am mounting this amplifier

and the PCB

Taht is suposed to get 100W RMS 4 Ohm at +/-30V, is that possible with a so low voltage?
What is the maximum voltage that can I use safly ,to get more output power
Is this a nice amplifier shematic?

Tanks :)

jmateus 16th October 2004 04:38 PM

100W car amplifier
O Portimao, Portimao, que saudades....

Lots of current, lots of it....
Check the component parameters and you'll see if it will be
possible to use bigger voltages...

My embrace to Praia da Rocha....

djk 17th October 2004 12:54 PM

No, of course it can't deliver anywhwere near 100W at 4 ohms. Matter of fact, it will blow up in your face if you try and build it, the bias diodes are all in backwards.

The maximum output swing is very limited by the rail voltage to the IC, then you have to subtract the losses in the output stage.

The NE5532 will only swing a maximum of 12V when powered off of 15V, the EF output stage will only get within 3V of that, so you will only get 9V output (peak), about 10W at 4 ohms.

Look at an ESP 3A with 42V, that will do 100W/4R, the transformer would best be a 30-0-30 200VA with a pair of 8,200F 50V filter caps

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