Headphone amp circuit - Help

S

Speakerguy

Active Member

• Oct 3, 2007

• #21

You will very likely have oscillation problems on the breadboard from reading the article. You will have large capacitive coupling between the + and - inputs due to the structure of the breadboard. I did not know you couldn't use an op amp, sorry.

 

wmmullaney

New Member

• Nov 7, 2007

• #22

Heres the simplest amp i could find.

https://scitoys.com/scitoys/scitoys/computers/solderless/amplifier.html

 

M

mneary

New Member

• Nov 7, 2007

• #23

So did you read the web page before or after starting the other thread?

 

audioguru

Well-Known Member

Most Helpful Member

• Nov 7, 2007

• #24

It is a very lousy amplifier. Read what I said about it in the other thread.

 

Hero999

Banned

• Nov 10, 2007

• #25

audioguru,
You little amplifier needs emitter resistors to prevent the transistors from going in to thermal runaway.

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Nov 10, 2007

• #26

Hero999 said:

audioguru,
You little amplifier needs emitter resistors to prevent the transistors from going in to thermal runaway.

Click to expand...

Probably not?, as it's under-biased - particularly if the bias diodes are thermally coupled to the output transistors. But really it's a just a piddling little amp, based on the minimum component count.