TDA1541A and CS8412 how to connect

[dj_holmes]

Hi,

I have an Arcam black box with the TDA1541A chip. After doing a lot of reading I managed to removed the filter chip and works even better. Then a lot more reading and discovered a lot of people connecting a I2s board to the TDA. I purchased one and struggling to get it to work.

There is a post about removing the muting transistor to enable this which I did but no sound is coming out!

I connected WSBD - LRCK, CLBD to BCLK and DABD to DATA. Connected a 5v power source also to the board but nothing after feeding it with a 16 bit 44.1 signal.

Any help greatly appreciated!

 

[rfbrw]

There is a post about removing the muting transistor to enable this which I did but no sound is coming out!

Would that be the transistor (Q209?) that drives the relay that mutes the output at switch on ?

 

[dj_holmes]

Hi, no I removed Q305 which mutes the DABD signal!

 

[rfbrw]

What is the voltage at pin 3 of the TDA1541 with a signal present at the input ?

 

[dj_holmes]

6V

when I measure from dac of ground to pin 3 I get 6v but from the ground of the coax card to pin 3 I get 1.8v

 

[dj_holmes]

anyone have any advice please?

 

[rfbrw]

Have you got an oscilloscope ? Failing that, have you got something else to which you can connect the CS8412 board to confirm it works ?

 

[sthcoaster]

Where do you connect the ground from the new CS8412 board? I can't remember where I put it when I used similar in with an old arcam alpha board but I do remember it did matter that there was a ground connection between my 2 boards

Just dragged it out of the cupboard. Looks like I have linked GND from the CS chip to a GND at the TDA - don't think it matters AGND or DGND. However, this might have been necessary for me because I used tube output? It's all too long ago.

 

[dj_holmes]

Have you got an oscilloscope ? Failing that, have you got something else to which you can connect the CS8412 board to confirm it works ?

My scope is very cheap and limited to Khz not Mhz. My multi meter actually does Mhz!

What am i measuring?

 

[dj_holmes]

Where do you connect the ground from the new CS8412 board? I can't remember where I put it when I used similar in with an old arcam alpha board but I do remember it did matter that there was a ground connection between my 2 boards

Just dragged it out of the cupboard. Looks like I have linked GND from the CS chip to a GND at the TDA - don't think it matters AGND or DGND. However, this might have been necessary for me because I used tube output? It's all too long ago.

You are the man! Its done!!!! It wouldn't work with the chassis ground but another ground did!

Thank you good sir! Thanks for all that helped!

 

[rfbrw]

Must be getting old. Should have spotted that with this - "from the ground of the coax card to pin 3 I get 1.8v"

 

[dj_holmes]

So happy either way! Thanks!

 

[sthcoaster]

Brilliant!!

I have been a member and beneficiary of this forum for 4 years - this is the first time I have been able to be the helper rather than the helpee!! This means I must have learnt something in that time.

 

[dj_holmes]

Hopefully I will be on your level soon after 10-15 years on this forum LOL