Low power audio circuit design

[Newtopprojects]

We have designed a low power audio circuit with TS472 and PAM8304D. We took the reference from their datasheets, connected all components, powered it on, and verified all components had voltage. It did not work :-(


Can some senior members please take a look and shed some light? Thank you,

 

[Harald Kapp]

The application circuit looks different:

 

[Newtopprojects]

The application circuit looks different:
View attachment 51290

We need a mono audio circuit. We checked the PAM8303 first but their website said it's not recommended for new design. That's why we switched to PAM8304, which is stereo. We don't have many needed equipment yet. So we only checked the voltage at each pin. But not sound was produced at all. We will try to modify the circuit and test the voltage changes at each pin along the way while supply an audio input.
Thank you for your advice.

 

[WHONOES]

Hi. The PAM8304 is not stereo output. It uses a bridged output. You need to connect your speaker directly across the two output terminals.

 

[Audioguru]

The PAM8304 is mono and the PAM8403 is stereo.
Yeah, maybe he connected the speaker to one output of the mono PAM8303 or PAM8304 and wrongly to ground.

 

[Newtopprojects]

Hi. The PAM8304 is not stereo output. It uses a bridged output. You need to connect your speaker directly across the two output terminals.

You're right. PAM8304 is mono. We will modify and test it again next week. Thank you for your advice.

 

[Newtopprojects]

The PAM8304 is mono and the PAM8403 is stereo.
Yeah, maybe he connected the speaker to one output of the mono PAM8303 or PAM8304 and wrongly to ground.

You're right. PAM8304 is mono. We will try it again next week. Your advice is appreciated.

 

[Harald Kapp]

We checked the PAM8303 first

I reference not the output driver but the input amplifier TS472!

 

[WHONOES]

I was referring to detail of the original post.

 

[Technomaniac]

It has only a 1uF bypass on Vcc. Make sure it is not too far to the big power supply electro.

 

[Newtopprojects]

Teaming up with a friend to develop this circuit. Will update when successfully done. Thank you all for the great advices.