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Help!!! Audio Amp

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mataous

New Member
Can anyone help me by telling me how this circuit works please! i have a project to do by tuesday and i dont have a clue how it works!!
 

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Sceadwian

Banned
Looks like a class AB amplifier to me. What does this circuit have to do with your project and why don't you know how it works?
 

Sceadwian

Banned
Not exactly your project then is it? You just picked a circuit off the net now you wanna pick the brains of people here to fill out information and turn it in? There's quiet a few things going on in that circuit, nothing excessively complex, what exactly are you having trouble with?
 
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mataous

New Member
well ive been doin some research on the net and found that it might have somthing todo with push-pull amplification? maybe?
 

microtexan

New Member
Can anyone help me....i have a project to do:rolleyes::rolleyes::(

At least he didn't wait until Monday evening.:D
 

audioguru

Well-Known Member
Most Helpful Member
It is a very simple audio amplifier circuit.
What information about it is needed?
 

Sceadwian

Banned
Not that simple for me audioguru =) The feedback network looks relatively complicated, at least to me.
 

mataous

New Member
my work colleagues said exacally the same! the transisters are the push pull part of the circuit and the op amp amplifies the circuit! they couldnt explain the feedback tho! they also said that C3 and C4 were references for the opamp! would you agree?
 

Chippie

Member
The feedback network characterises the amplifier.....No point in amplifying signals above say 22khz or below 20hz...
 

audioguru

Well-Known Member
Most Helpful Member
Not that simple for me audioguru =) The feedback network looks relatively complicated, at least to me.
The original project describes the bass-boost control in the feedback loop:
10W Audio Amplifier with Bass-boost - RED - Page61

The original simple audio amplifier is on that website (18W Amplifier using an opamp with a higher voltage rating for a higher output power) without the bass-boost control.
 

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Nigel Goodwin

Super Moderator
Most Helpful Member
my work colleagues said exacally the same! the transisters are the push pull part of the circuit and the op amp amplifies the circuit! they couldnt explain the feedback tho! they also said that C3 and C4 were references for the opamp! would you agree?

NO - they are power supply decouplers.

It's a really crappy old circuit though, never any good, and even less so now.
 

Sceadwian

Banned
C3 and C4 are powersupply decoupling capacitors. They're there to buffer the power supply a little and usually located very close to the opamp.
 
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