Low power audio circuit design

Thread Starter

Newtopprojects

Joined Mar 19, 2021
8
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,

audio circuit - TS472 - 20210302.jpg
 

ericgibbs

Joined Jan 29, 2010
12,260
hi Ntp,
Welcome to AAC.
Using a scope did you verify exactly where on the circuit the test signal was interrupted.?
Try injecting a low level test signal into the C12/13 and or C14/16. [ you may have to lift off one end of C12/16]
That will check the amp stage, lets know your results.

I have used the PAM8303 Audio amp without any problem

E
 

Thread Starter

Newtopprojects

Joined Mar 19, 2021
8
hi Ntp,
Welcome to AAC.
Using a scope did you verify exactly where on the circuit the test signal was interrupted.?
Try injecting a low level test signal into the C12/13 and or C14/16. [ you may have to lift off one end of C12/16]
That will check the amp stage, lets know your results.

I have used the PAM8303 Audio amp without any problem

E
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 test the voltage changes at each pin along the way while supply an audio input.
Thank you for your advice.
 

Audioguru again

Joined Oct 21, 2019
2,875
On the other website forum it was asked if the mono PAM8304 has one of its bridged outputs connected to the speaker and wrongly had the other speaker wire connected to ground (thinking wrongly it is a stereo amplifier).
 

Thread Starter

Newtopprojects

Joined Mar 19, 2021
8
On the other website forum it was asked if the mono PAM8304 has one of its bridged outputs connected to the speaker and wrongly had the other speaker wire connected to ground (thinking wrongly it is a stereo amplifier).
A PAM8403 was an old mono amplifier. It is obsolete and not available.
A PAM8304 is a stereo amplifier that is also obsolete but is still available.
Your circuit has many parts that are not needed:
Thank you so much for your advice again. Diodes website does not say PAM8304 is discontinued. That's why we use it. If its product life is ending, can you please recommend another mono alternative? Thank you,
 

Audioguru again

Joined Oct 21, 2019
2,875
I also got my numbers mixed up.
The PAM8304A is a mono amplifier. Digikey has 1530 of them in an 8msop package.
The PAM8403 is a stereo amplifier. Digikey has 25,000 of them in a 16msop package. 3 other packages are obsolete.

Do you understand that the PAM8304A mono output is bridged with the speaker directly connected to its two bridged output pins?
 

Thread Starter

Newtopprojects

Joined Mar 19, 2021
8
I also got my numbers mixed up.
The PAM8304A is a mono amplifier. Digikey has 1530 of them in an 8msop package.
The PAM8403 is a stereo amplifier. Digikey has 25,000 of them in a 16msop package. 3 other packages are obsolete.

Do you understand that the PAM8304A mono output is bridged with the speaker directly connected to its two bridged output pins?
I also got my numbers mixed up.
The PAM8304A is a mono amplifier. Digikey has 1530 of them in an 8msop package.
The PAM8403 is a stereo amplifier. Digikey has 25,000 of them in a 16msop package. 3 other packages are obsolete.

Do you understand that the PAM8304A mono output is bridged with the speaker directly connected to its two bridged output pins?
Not really. What we have is PAM8304. Does PAM8304A mean different packaging like ASR? Can you please advise if the attached PAM8304 circuit might work? Thank you!
 

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Audioguru again

Joined Oct 21, 2019
2,875
Your PAM8304 has no speaker connected so it will not work.
We want to see if you wrongly connected one speaker wire to ground like you would with a normal stereo amplifier.
 

Thread Starter

Newtopprojects

Joined Mar 19, 2021
8
Your PAM8304 has no speaker connected so it will not work.
We want to see if you wrongly connected one speaker wire to ground like you would with a normal stereo amplifier.
I thought the circuit in the attached screenshot included PAM8304 connection to speaker? Can you please double check?
Thank you,
 
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