Well that makes two of us. Essentially is a 3.3V Square wave that goes through the circuit shown below. "Other Input" is a PSG just like an ST. So this should be pretty familiar. Its just going to be a case of getting the right values for the bias i guess.exxos wrote: 02 Jan 2023 22:25 I don't know anything about the MSX unfortunately. Is there not any schematics for such a FPGA system ? maybe just needs a stupid pull-up on the pin or something ? I have no idea what the FPGA is trying to output. I know pretty much diddly squat about FPGA stuff as well.
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TFMSX Sound Circuit
Moderators: terriblefire, Terriblefire Moderator
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terriblefire
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Re: TFMSX Sound Circuit
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———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
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exxos
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Re: TFMSX Sound Circuit
The values on the H4 audio amp were not that far off from the original ST circuit. It is only really a buffer / mixer. But that 100nF could be upsetting your results.terriblefire wrote: 02 Jan 2023 22:32 Well that makes two of us. Essentially is a 3.3V Square wave that goes through the circuit shown below. "Other Input" is a PSG just like an ST. So this should be pretty familiar. Its just going to be a case of getting the right values for the bias i guess.
But that screenshot you posted earlier I really would just use that as it should work and be all set up fine anyway.
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Gooeyblob
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Re: TFMSX Sound Circuit
No sound at all? Have you tried SCC games like Nemesis 2 or 3?
Also try using the Megaflash /P1 parameter to clone psg to the cart.
Also try using the Megaflash /P1 parameter to clone psg to the cart.
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exxos
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Re: TFMSX Sound Circuit
@terriblefire So that's simulation is the circuit you have actually built ? Because those series 100nf will not be large enough I think.. Probably need 1uF - 10uF really. Ceramic is best.
This is my original simulation circuit..
Ignore R5 & C3 on that.
For your circuit, this would / should be a "get you running" type of design.
Also your "other input" should really be floating are not connected to GND.
This is my original simulation circuit..
Ignore R5 & C3 on that.
For your circuit, this would / should be a "get you running" type of design.
Also your "other input" should really be floating are not connected to GND.
You do not have the required permissions to view the files attached to this post.
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terriblefire
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Re: TFMSX Sound Circuit
The 100nF cap that you've changed to 10uF is part of the carts delta sigma DAC setup. Sorry i realize that wasnt very clear before.
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
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terriblefire
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Re: TFMSX Sound Circuit
So i think i've sorted it ... created a new mixer circuit and tested it today
and
I think i'll drop the Yamaha gain by 20% as its just clipping. Thats the TFMSX problems that i know of all solved.
and
I think i'll drop the Yamaha gain by 20% as its just clipping. Thats the TFMSX problems that i know of all solved.
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
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PhilC
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Re: TFMSX Sound Circuit
Great to hear more progress has been made.
If it ain't broke, test it to Destruction.
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stephen_usher
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Re: TFMSX Sound Circuit
Hoopy!
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
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ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
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