Interface 32 ohm, 0.25W speaker with AT89C52

[shigha]

I want to play music with AT89C52. I got the codes and simulated on proteus well. But i know that to get it in hardware, i must amplify it.
How can I do it?
Can I use LM386?

 

[jayanth.devarayanadurga]

Yes. You can use it.

 

[shigha]

I used it but iam not getting any output. What should I do?

 

[jayanth.devarayanadurga]

Post you opamp circuit.

 

[shigha]

I used this ones circuit

 

[jayanth.devarayanadurga]

Use these circuits. You need a filter between MCU o/p pin and op-amp input pin. You can't give digital o/p directly to op-amp input. You will get cracking noise.

 

[shigha]

But Iam not getting any sounds at all. Please note that Iam talking about 32 ohm speaker

 

[jayanth.devarayanadurga]

Whatever it is. I think you are using PWM for sound generation and you need a filter between pwm o/p and op-amp input.

See the project I did here. https://www.edaboard.com/threads/271596/

https://www.edaboard.com/threads/271425/