PokeyMax v2B installation issue

[mmoec]

Hi 👋 
I just finished pimping out this 130XE with the following:
VBXE
UAV
SAVO XE
U1MB
PokeyMax v2B (Stereo + Quad Covox) 

Triple checked all my wiring, fired it up and (yeah! 😃) it booted to SDX. The only issue is there is this loud buzzing noise coming from the TV speakers. I double checked all the wiring again and everything looks sound. I put the Pokey chip back in and the buzzing stops. The L and R audio from the PokeyMax are connected to the L and R audio on the SAVO, and the jumper is removed. I wired the PokeyMax according to this diagram I found on the RetroLemon site. My question is, am I supposed to add those two 10uf resistors to the L and R audio 🤔? Initially it looked to me like they were only to be added if the audio was being connected to an external device.

[foft]

I was replying on facebook, but for the benefit of the thread...

• Pokeymax 2B has the external decoupling caps built-in, its just Pokeymax 2 that doesn't.
• There are 4 outputs and the 4th goes direct to pin 37, its not on the header
• To play bad audio like that I'd say most likely it has the wrong core and has gtia audio input on one of those address inputs.
• Run pokeycfg to check the version is correct.

[+scorpio_ny]

I had the buzzing sound when I used my Pokeymax was due to using the ground from the Pokeymax pin itself. I solved it by picking up ground somewhere else on my XE remake (I think I picked it up from the pins on the cart/eci port).

 

How are you grounding your external  audio from the SAVO? Also, it seems you have a wire from the ground pin going to the ground plane of the PCB. In my setup, I left it unconnected since I picked up ground somewhere else.

 

@foft: Is it necessary to connect up the ground from the Pokeymax if it is not used?

 

 

[mmoec]

Issue Resolved!

I have been in contact with the person who sold me the PokeyMax and I found out exactly what version I have (Quad version with Auto control) and wired it according to one of the diagrams I found on the RetroLemon site, and the device is now working properly. Thanks to all who took the time to share their input, and apologies for not responding sooner, as I was unable to make the time.

 

👍