LAB10 Audio Amplifier Project
This is an experimental and easy build audio amplifier.
You can make changes and improvements in several ways.
The possibilities are endless!
Amplifier Details in this PDF:
LAB10 Audio Amplifier
More info at this website:
Attachment shows the basic circuit for
LAB10 Audio Amplifier
The op-amp follower is a pretty common idea. They make quite good headphone amps too :)
Re: LAB10 Audio Amplifier Project
op amps & darlingtons
I used to make guitar practice amps using 741,s into h/phones they worked great you could over drive them into clipping distortion for effects if you wanted.
There was a better alternative with 2 amps in the 8 leg package I think
it was a 1448 I used these to make a disco console coupled to 125
watt amplifier modules from greenweld electronics it all worked successfully they are simple and reliable devices.
regarding Darlingtons Sony use them in multiples in the output stages of their home cinema amplifiers -Sanken 2448 & 1620
The feedback of the op-amp should be connected to the output of the power amp.
No coupling caps (C1/C3) needed, and use a fet input op-amp, non inverting.
Some small changes to that circuit would make it perform better.
Won't this amp run into thermal runaway ? I think emitter resistors are missing.
there is no bias in output stage ( or very very little )
'bias voltage' is set by 3 diodes ~3x0.6 = 1.8 volt
but to turn two Darlingtons on, we need, more than 4 Base-Emitter drops
normal turn on for one darlington is something like 1.0V
in this case we need a bias voltage of ~ 2.0 volt to turn two darlingtons
So 3x0.6V = 1.8V is not enough
Lovely amplifier Line up..thank you to show it to me
I love those simple circuits....this 741 is very famous, and was used since the seventies...it is nice.
741 :dead: LF351: Jfet Input :)
Check the pinout, i think it' s not the same.
By the way, it's a good newbie project.
+input - pin3
-input - pin2
+Volt - pin7
-Volt - pin4
Output - pin6
We should not use uA741 for audio anymore.
Good replacement for uA741 could be:
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