Nearly all JAMMA boards have a built in sound amp, it's part of the JAMMA spec so the only games that don't have them are odd-balls. additional amplification would likely make it worse.
Yes there is a AMP on the PGM motherboard. is it 8W + 8W from memory.. its the chip on the heat sink. it was made for Car Stereo amps anyway...
Thanks for the kind words.. it will be at least 2 months i have to survie.. maybe longer depending on what the Corona Virus does....ouff! sorry to hear man. Hope its sorted out soon!
Already done it
Straight out of the DAC is WAY better quality . Thats were my "Sterio" mod takes it from.
Do you just want a list of caps silk screen numbers, and what to put in there place??tell us more, which caps and what with. I would like better sound from my PGM please
I would be very interested and appreciative of this also! My soldering iron is warming up. ;P Thanks Tim!Do you just want a list of caps silk screen numbers, and what to put in there place??tell us more, which caps and what with. I would like better sound from my PGM please
Tim.
OK i did this list based of a REV12 PGM Motherboard.. other revs may need a different list..... PLUS i recommend 105 Deg C caps.. i also use 125 Deg C caps. Now all caps have different heights.. the PGM needs as short as possible to fit under the PLASTIC!! IF you have modded the plastics.. you may have more height....I would be very interested and appreciative of this also! My soldering iron is warming up. ;P Thanks Tim!Do you just want a list of caps silk screen numbers, and what to put in there place??Tim.tell us more, which caps and what with. I would like better sound from my PGM please
Yeah, arcade boards have an amp. Do you have a supergun or anything else to test the board with? It may need a recap.
Really appreciate it Tim, will be fun to experiment, ordered up some various caps, we'll see how it goes. I love tinkering on the PGM because it's not the end of the world if something breaks! =)OK i did this list based of a REV12 PGM Motherboard.. other revs may need a different list..... PLUS i recommend 105 Deg C caps.. i also use 125 Deg C caps. Now all caps have different heights.. the PGM needs as short as possible to fit under the PLASTIC!! IF you have modded the plastics.. you may have more height....I would be very interested and appreciative of this also! My soldering iron is warming up. ;P Thanks Tim!Do you just want a list of caps silk screen numbers, and what to put in there place??Tim.tell us more, which caps and what with. I would like better sound from my PGM please
Check you PSU / Arcade supply for ripple and noise. AS this WILL effect the sound.. and for that matter any other JAMMA pcb....
-5V is NOT need for the PGM.
OK... few notes. the DSP voltage supply comes from a seprite 7805 TO92 regulator. The caps on incoming and outgoing supply are WAY to small. This reduces ripple and makes the DSP more "stable".
C9 and C10 SHOULD be AT LEAST 100UF 35V LOW ESR caps. You can put a larger cap in IF it fits.....
C8 is 12V supply filter cap for the Amp module. 680UF 25V/35V as long as it fits
C2 is Ripple rejection. Spec says 100UF. BUT higher voltage is lower ESR so i would use a cap larger than 100uf 35v. I DID notice quite a lot of different results across different motherboard / modding this cap. SO your board may behave different to mine. Its a cap to "fiddle" with
C3 C4 C5 AGAIN LOW ESR Caps. ALL 680UF 25v/35V as long as they fit.
Thats it guys,
Tim.
No supergun yet but someday I'll get a HAS. I have a Sega Astro =). Thanks Neo.
If you have a pimped out Rev14 MB and a KOV Vs Street Fighter cart, would love to buy them, let me know where to send you $$
Yeah i hate it when people do that mod!!! I do have 20mm volume pots. BUT you really need 16mm pots. For the 20mm post the case had to be modded to fit it... But i bet they have butchered the case anyway.. so the 20mm would be fine.
If i had some Demon Front.. i would sell it
