Audio amplifier circuit noise problem???

fredli

Audio amplifier circuit noise problem??? [Copy link]

The audio amplifier circuit I made has a lot of noise, a rustling sound, and it burned two transistors, so I connected a larger resistor in series to reduce the voltage division, but the noise is super loud.
Other problems are as follows:
1. When using mp3 as the audio input, there is no sound after power is turned on, and there is sound only a few seconds after the power is turned off; the noise is also very loud.
2. When using the computer's audio input, there is sound after power is turned on, and although the song can be heard, the noise is very loud; after power is turned off, the sound gradually disappears.
3. When the audio input is not connected, after power is turned on, there is no sound no matter how high the potentiometer is adjusted.
I want to know what's wrong with my circuit? And please tell me the solution! Thanks in advance! A big reward later!
The circuit diagram is as follows:

lykeeworld

Can't see the circuit diagram? How can I get someone to answer?

xiaoxif

It has been almost a month since the author posted the question. Mr. Lykeeworld on the sofa must be eagerly waiting for it! I have also been waiting for the author's response to the gentleman on the sofa and your opinions. The author must not "shoot and run" or even "shoot and run" and disappoint the enthusiasm of friends.

lopopo

Posted on 2006-12-16 23:13 I have waited for 3 years but still haven't seen the original poster post a picture. People born in the Year of the Ox