Arrington 4-voice sound module

[Abzman]

I have a version of this I designed with some upgrades:

• headphone jack

• switch for enabling certain one-bit game sounds

• full 8-bit audio resolution for supported software

• smaller size

• modern components

https://abzman2k.wordpress.com/2024/02/ ... ound-card/

I had a handful of boards made so I have some spares if anyone wants one.

[johnhalk]

Hi Abzman,

Welcome to the Exidy Sorcerer Forums.

Could we get some Gerber PCB files and a parts list together ? I would be keen to make one !

Regards,
John Halk

[Abzman]

They're linked on my github and the pcbway project from the blog post, but I have 3 spare boards and parts, I can just make you one and mail it to you

[johnhalk]

Hi Abzman,

If you can put one together for me - I will reimburse you for the costs including air mail postage to Australia via PayPal family and friends direct payment.

Thanks,
John Halk

They're linked on my github and the pcbway project from the blog post, but I have 3 spare boards and parts, I can just make you one and mail it to you

[jltursan]

Yep, I'm also interested in a PCB!.

In fact, it comes in the right time as I'm finishing a port of the MPAGD engine for the Sorcerer and for now, there's no sound implemented. With this sound module, I can at least program some 1-bit routines or maybe some with more resolution if I can find the device's programming info.

[Abzman]

Well, in 'music' mode the voltage on the audio pin is proportional to the 8-bit binary value on the parallel output port. That's it, count up linearly and once you hit 255 you count down until 0 and repeat and that's a triangle wave. The 1 bit mode just uses bit 0, but you can get the same effect by leaving it in music mode and playing with bit 7 (if I recall correctly). I'll build up the rest and get with folks on shipping stuff once they're done and tested.

[Abzman]

While assembling the last of the boards I originally designed I wanted some revisions to aid machine assembly and subtle-ly add features. Version 2 has:

• Wider footprint for fitting two sizes of SOIC part

• All parts on one side to aid machine assembly

• using the switched function in the headphone jack to disconnect the RCA when headphones are plugged in

• a bypass jumper for the above feature

• properly labeled bit0 and bit1 resistors

You may notice that almost all the functionality is exactly the same, so I can't really think of much reason to want v2, I just did it because if I was going to do a second run maybe I'd fix some things.

I have updated the git repo, but nothing else yet because I haven't built and validated it yet, but here's a render of v2

kicad_8Tymh5Gt8Y.png (73.02 KiB) Viewed 70234 times

kicad_IIXPFC5nXZ.png (65.82 KiB) Viewed 70234 times