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Why the output signal of my amplifier is heavily distorted

Lots of noise in the microphone amplifier circuit when idleLM386 audio amplifier circuit does not workQuestion regarding simple preamp+audio amplifierconnect 2 speakers to act as a telephoneChaining output of amplifier (to speaker) to another amplifierTwo different circuits not working on same power supply.?Having trouble converting an audio signal to be usable by a mic inputclass AB amplifier distortionWhat microphone (sound sensor) that can work with Arduino to detect gunshot?Loudspeaker / Amplifier “POPP” sound

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1

$begingroup$

I checked the circuit 1 million times. I got it from a website. Everything is correctly connected. The sound is loud but it is very distorted.I use a 9V battery

Where is the problem ?? :(

amplifier speakers sound lm386

share|improve this question

edited 8 hours ago

user287001

10.2k1618

asked 8 hours ago

Στελιος ΛιακοπουλοςΣτελιος Λιακοπουλος

62

New contributor

Στελιος Λιακοπουλος is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  You haven't told us what signal you are feeding in and what voltage it is.
  $endgroup$
  – Transistor
  8 hours ago
  

  
  
  
  

add a comment | 

1

$begingroup$

I checked the circuit 1 million times. I got it from a website. Everything is correctly connected. The sound is loud but it is very distorted.I use a 9V battery

Where is the problem ?? :(

amplifier speakers sound lm386

share|improve this question

edited 8 hours ago

user287001

10.2k1618

asked 8 hours ago

Στελιος ΛιακοπουλοςΣτελιος Λιακοπουλος

62

New contributor

Στελιος Λιακοπουλος is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  You haven't told us what signal you are feeding in and what voltage it is.
  $endgroup$
  – Transistor
  8 hours ago
  

  
  
  
  

add a comment | 

$begingroup$

I checked the circuit 1 million times. I got it from a website. Everything is correctly connected. The sound is loud but it is very distorted.I use a 9V battery

Where is the problem ?? :(

amplifier speakers sound lm386

share|improve this question

edited 8 hours ago

user287001

10.2k1618

asked 8 hours ago

Στελιος ΛιακοπουλοςΣτελιος Λιακοπουλος

62

New contributor

Στελιος Λιακοπουλος is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

share|improve this question

edited 8 hours ago

user287001

10.2k1618

asked 8 hours ago

Στελιος ΛιακοπουλοςΣτελιος Λιακοπουλος

62

New contributor

Στελιος Λιακοπουλος is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 8 hours ago

user287001

10.2k1618

asked 8 hours ago

Στελιος ΛιακοπουλοςΣτελιος Λιακοπουλος

62

New contributor

Στελιος Λιακοπουλος is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited 8 hours ago

user287001

10.2k1618

edited 8 hours ago

user287001

10.2k1618

asked 8 hours ago

Στελιος ΛιακοπουλοςΣτελιος Λιακοπουλος

62

New contributor

Στελιος Λιακοπουλος is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 8 hours ago

Στελιος ΛιακοπουλοςΣτελιος Λιακοπουλος

62

2 Answers
2

active

oldest

votes

6

$begingroup$

LM386 needs an AC coupling capacitor on its input.

If your input circuit is DC coupled, you disrupt the input biasing arrangements built into the amplifier. Instead of being centred, the output voltage is probably close to one of the supply rails, clipping the positive or negative half of the AC waveform, resulting in severe distortion.

Insert 1 uF (or 10 uF) in the path labelled "Mono_Audio" on the schematic.

share|improve this answer

answered 7 hours ago

Brian DrummondBrian Drummond

48.2k139110

$endgroup$

add a comment | 

3

$begingroup$

Probably because the input signal level is too high. To test this, add a 100 ohm resistor from pin 3 to GND. The output volume will be reduced, but, if high input level is the problem, it also will be less distorted. Consider adding a volume control at the input. It is shown on the datasheet applications.

Also, pay very careful attention to the power supply decoupling. Add a 100 nF ceramic capacitor in parallel with the 100 uF electrolytic, and make sure the leads are as short as possible and as close as possible to the device pins 4 and 6

Also, there should be a coupling capacitor between the junction of the two input resistors and pin 3. This is to remove any residual DC on the incoming signals, which can affect the output voltage range.

Also, there should be a 10 ohm resistor in series with the 100 nF capacitor on the output to ground. This is called a Zobel network and works to reduce high frequency oscillations, which can sound like distortion.

Note: it is much easier to discuss the components of a circuit if the schematic has a unique reference designator for each one.

share|improve this answer

edited 8 hours ago

user287001

10.2k1618

answered 8 hours ago

AnalogKidAnalogKid

3,19437

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  the input signal level isn't high. It is from a mp3 player
  $endgroup$
  – Στελιος Λιακοπουλος
  7 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  i burned both of my LM386 chips. The first because i did wrong connections and the second because i thought the problem was the 9 volts of the battery and i used a 24volt adaptor to power the circuit(i am stupid). When i buy new ones and build the circuit again i will try your solutions
  $endgroup$
  – Στελιος Λιακοπουλος
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  The output level from an mp3 player can be too high for this amplifier. You have the gain set to 20, the maximum output it can provide is probably about 5-6V pk-pk, the maximum input will, therefore be about 1/4 V.Turn down the volume on the player.
  $endgroup$
  – Kevin White
  6 hours ago
  
  

  
  
  
  

add a comment | 

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6

$begingroup$

LM386 needs an AC coupling capacitor on its input.

If your input circuit is DC coupled, you disrupt the input biasing arrangements built into the amplifier. Instead of being centred, the output voltage is probably close to one of the supply rails, clipping the positive or negative half of the AC waveform, resulting in severe distortion.

Insert 1 uF (or 10 uF) in the path labelled "Mono_Audio" on the schematic.

share|improve this answer

answered 7 hours ago

Brian DrummondBrian Drummond

48.2k139110

$endgroup$

add a comment | 

6

$begingroup$

LM386 needs an AC coupling capacitor on its input.

If your input circuit is DC coupled, you disrupt the input biasing arrangements built into the amplifier. Instead of being centred, the output voltage is probably close to one of the supply rails, clipping the positive or negative half of the AC waveform, resulting in severe distortion.

Insert 1 uF (or 10 uF) in the path labelled "Mono_Audio" on the schematic.

share|improve this answer

answered 7 hours ago

Brian DrummondBrian Drummond

48.2k139110

$endgroup$

add a comment | 

$begingroup$

LM386 needs an AC coupling capacitor on its input.

If your input circuit is DC coupled, you disrupt the input biasing arrangements built into the amplifier. Instead of being centred, the output voltage is probably close to one of the supply rails, clipping the positive or negative half of the AC waveform, resulting in severe distortion.

Insert 1 uF (or 10 uF) in the path labelled "Mono_Audio" on the schematic.

share|improve this answer

answered 7 hours ago

Brian DrummondBrian Drummond

48.2k139110

$endgroup$

share|improve this answer

answered 7 hours ago

Brian DrummondBrian Drummond

48.2k139110

answered 7 hours ago

Brian DrummondBrian Drummond

48.2k139110

answered 7 hours ago

Brian DrummondBrian Drummond

48.2k139110

3

$begingroup$

Probably because the input signal level is too high. To test this, add a 100 ohm resistor from pin 3 to GND. The output volume will be reduced, but, if high input level is the problem, it also will be less distorted. Consider adding a volume control at the input. It is shown on the datasheet applications.

Also, pay very careful attention to the power supply decoupling. Add a 100 nF ceramic capacitor in parallel with the 100 uF electrolytic, and make sure the leads are as short as possible and as close as possible to the device pins 4 and 6

Also, there should be a coupling capacitor between the junction of the two input resistors and pin 3. This is to remove any residual DC on the incoming signals, which can affect the output voltage range.

Also, there should be a 10 ohm resistor in series with the 100 nF capacitor on the output to ground. This is called a Zobel network and works to reduce high frequency oscillations, which can sound like distortion.

Note: it is much easier to discuss the components of a circuit if the schematic has a unique reference designator for each one.

share|improve this answer

edited 8 hours ago

user287001

10.2k1618

answered 8 hours ago

AnalogKidAnalogKid

3,19437

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  the input signal level isn't high. It is from a mp3 player
  $endgroup$
  – Στελιος Λιακοπουλος
  7 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  i burned both of my LM386 chips. The first because i did wrong connections and the second because i thought the problem was the 9 volts of the battery and i used a 24volt adaptor to power the circuit(i am stupid). When i buy new ones and build the circuit again i will try your solutions
  $endgroup$
  – Στελιος Λιακοπουλος
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  The output level from an mp3 player can be too high for this amplifier. You have the gain set to 20, the maximum output it can provide is probably about 5-6V pk-pk, the maximum input will, therefore be about 1/4 V.Turn down the volume on the player.
  $endgroup$
  – Kevin White
  6 hours ago
  
  

  
  
  
  

add a comment | 

3

$begingroup$

Probably because the input signal level is too high. To test this, add a 100 ohm resistor from pin 3 to GND. The output volume will be reduced, but, if high input level is the problem, it also will be less distorted. Consider adding a volume control at the input. It is shown on the datasheet applications.

Also, pay very careful attention to the power supply decoupling. Add a 100 nF ceramic capacitor in parallel with the 100 uF electrolytic, and make sure the leads are as short as possible and as close as possible to the device pins 4 and 6

Also, there should be a coupling capacitor between the junction of the two input resistors and pin 3. This is to remove any residual DC on the incoming signals, which can affect the output voltage range.

Also, there should be a 10 ohm resistor in series with the 100 nF capacitor on the output to ground. This is called a Zobel network and works to reduce high frequency oscillations, which can sound like distortion.

Note: it is much easier to discuss the components of a circuit if the schematic has a unique reference designator for each one.

share|improve this answer

edited 8 hours ago

user287001

10.2k1618

answered 8 hours ago

AnalogKidAnalogKid

3,19437

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  the input signal level isn't high. It is from a mp3 player
  $endgroup$
  – Στελιος Λιακοπουλος
  7 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  i burned both of my LM386 chips. The first because i did wrong connections and the second because i thought the problem was the 9 volts of the battery and i used a 24volt adaptor to power the circuit(i am stupid). When i buy new ones and build the circuit again i will try your solutions
  $endgroup$
  – Στελιος Λιακοπουλος
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  The output level from an mp3 player can be too high for this amplifier. You have the gain set to 20, the maximum output it can provide is probably about 5-6V pk-pk, the maximum input will, therefore be about 1/4 V.Turn down the volume on the player.
  $endgroup$
  – Kevin White
  6 hours ago
  
  

  
  
  
  

add a comment | 

$begingroup$

Probably because the input signal level is too high. To test this, add a 100 ohm resistor from pin 3 to GND. The output volume will be reduced, but, if high input level is the problem, it also will be less distorted. Consider adding a volume control at the input. It is shown on the datasheet applications.

Also, pay very careful attention to the power supply decoupling. Add a 100 nF ceramic capacitor in parallel with the 100 uF electrolytic, and make sure the leads are as short as possible and as close as possible to the device pins 4 and 6

Also, there should be a coupling capacitor between the junction of the two input resistors and pin 3. This is to remove any residual DC on the incoming signals, which can affect the output voltage range.

Also, there should be a 10 ohm resistor in series with the 100 nF capacitor on the output to ground. This is called a Zobel network and works to reduce high frequency oscillations, which can sound like distortion.

Note: it is much easier to discuss the components of a circuit if the schematic has a unique reference designator for each one.

share|improve this answer

edited 8 hours ago

user287001

10.2k1618

answered 8 hours ago

AnalogKidAnalogKid

3,19437

$endgroup$

share|improve this answer

edited 8 hours ago

user287001

10.2k1618

answered 8 hours ago

AnalogKidAnalogKid

3,19437

edited 8 hours ago

user287001

10.2k1618

edited 8 hours ago

user287001

10.2k1618

answered 8 hours ago

AnalogKidAnalogKid

3,19437

answered 8 hours ago

AnalogKidAnalogKid

3,19437