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Posted
any idea when I might be able to get my hands on some of these boards?

I hope soon. In my view there is a little issue with the A, B and C Pad size.

But when the board is available I will post it here of course.

Posted

My AY-3-8912 says to say "bleep bleep bloop"  ;D

edit: Actually, why doesn't he just say "hi" himself... ;-) Admittedly you can only get so far with random values in the registers but hey - it's a sign of life. Oh yeah, and ignore the -30db noisefloor it's not from the AY which is amazingly quiet but from my soundcard...

ay.mp3

Posted

that's great! ;D  i just need to find a PSU for this and my MBFM... :'(  i have the boards and such done i am just having a serious problem figuring out the PSU situation.  the same PSU would work for both wouldn't they?

Posted

You can easily leave out the opamp buffer board for testing. Just connect all three outputs via 10k resistors and add a pulldown of 1k-5k from that signal to ground.

Posted
You can easily leave out the opamp buffer board for testing. Just connect all three outputs via 10k resistors and add a pulldown of 1k-5k from that signal to ground.


        10k
(A) ---[===]-----+
                 |
        10k      |     1k-5k
(B) ---[===]-----+-----[===]---+
                 |             |
        10k      |           -----
(C) ---[===]-----+             -

This way?

Posted

        10k
(A) ---[===]-----+--------------->> OUTPUT
                 |
        10k      |         
(B) ---[===]-----+
                 |               
        10k      |     1k-5k         
(C) ---[===]-----+-----[===]---.
                              |
                              ---
                              -
[/code]

Like this, yeah :-)

  • 2 weeks later...

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