Troubleshooting Audio Amplifiers: Dealing with a Faulty Capacitor (C2)

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Discussion Overview

The discussion revolves around troubleshooting an audio amplifier circuit, specifically focusing on issues related to a capacitor (C2) and its interaction with a potentiometer. Participants explore potential causes of audio quality problems and circuit behavior.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant reports that the 1uF capacitor (C2) does not function properly when connected to the potentiometer, but audio can be heard when C2 is removed, albeit with poor quality.
  • Another participant suggests that if C2 is actually 10nF instead of 1uF, it could explain the issues, as the circuit may require a 10uF capacitor.
  • A participant expresses confusion about the capacitor's value and indicates that C2 works when connected differently, but still results in low audio quality.
  • One participant notes the difficulty in diagnosing the problem without knowing the internal details of the integrated circuit (IC) and mentions the lack of external feedback in the circuit.
  • Another participant questions the part number of the IC and suggests checking the potentiometer's setting, as it may not be centered, which could affect performance.
  • There is a request for more information about the source connected to the circuit to aid in troubleshooting.

Areas of Agreement / Disagreement

Participants express differing views on the capacitor's value and its impact on the circuit's performance. The discussion remains unresolved, with multiple competing hypotheses about the cause of the audio quality issues.

Contextual Notes

Limitations include unclear specifications of the IC and the capacitor values, as well as the absence of detailed circuit diagrams or feedback mechanisms that could influence the amplifier's behavior.

luigihs
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Hello people I am doing an audio amplifier, but I am really stuck in the circuit because the 1uF capacitor (C2 )doesnt work properly next the the potentiometer , but if I took off the Capacitor C2 I can hear music through my speakers, but with really bad quality. I don't know what you can recommend me guys thank you!

This is my circuit
565961_292214867544864_321470685_n.jpg
 
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If you have C2 = 10nF that might explain it. Correct value shown on the circuit is 10uF.
 
SOrry I got confused but I still doing right, the value of C2 that is 1 uF it doesn't work when is connected with the potentiometer only if I take off the C2 and connect the C2 next to pin 3 would be working , but with bad quality audio. I do this circuit so it should be errors nobody provide me an example.
 
It's really hard to say what is going on without knowing what is inside that IC.

I don't see any external feedback so I don't know how you are selecting gain, unless that IC is a power amplifier at fixed gain. Without seeing any feedback, the input bias current on pin3 may be causing the output to saturate.
 
I can't make out the part number on the IC either. LM0??

I assume you have tried the obvious and set the potentiometer to the middle of it's range? They are frequently supplied set to one end.

In addition to the IC number it might help to know what the source is?
 

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