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audio output from midi module
Posted: 14 Aug 2021 20:19
by alienkidmj12
Would of been nice to see some place to feed the audio from the midi module :) unless im missing it, perhaps an idea for next rev ?
Re: audio output from midi module
Posted: 14 Aug 2021 20:23
by PhilC
Do you have a B or a C1 board? C1 needs a resistor fitted and then the audio is sent through with the YM2149 audio. The B needs the mixer board fitted.
Re: audio output from midi module
Posted: 14 Aug 2021 20:26
by alienkidmj12
ah so its fed back into the board via the header, nice !!!!
Re: audio output from midi module
Posted: 14 Aug 2021 20:31
by PhilC
alienkidmj12 wrote: 14 Aug 2021 20:26
ah so its fed back into the board via the header, nice !!!!
It is indeed. Check out the fix for the audio bias though which is the resistor I mentioned.
Re: audio output from midi module
Posted: 14 Aug 2021 21:44
by alienkidmj12
ok cool
Re: audio output from midi module
Posted: 14 Aug 2021 23:25
by exxos
If you're talking about rev C1 , like philc says, it just needs a small resistor fix. This is because I redesigned the audio amp to mix the audio properly. The previous board was fixed using a separate addon board. Its part of the ongoing development. I would suggest reading the past progress and fixes for previous boards to understand how development and fixes have been done.
Re: audio output from midi module
Posted: 15 Aug 2021 12:31
by alienkidmj12
what kinda resistor do i need, is there a guide on here somewhere.
Re: audio output from midi module
Posted: 15 Aug 2021 12:36
by DoG
alienkidmj12 wrote: 15 Aug 2021 12:31
what kinda resistor do i need, is there a guide on here somewhere.
100K resistor.
Here is the thread about it and
this is how I did it.
Re: audio output from midi module
Posted: 15 Aug 2021 13:47
by alienkidmj12
i just looked mate, that is very small area to solder. how much did you have to scratch and with what :) il need to dig out my mag glasses :) im guessing i solder onto the via first then scratch away at the other end, then solder last bit.
Re: audio output from midi module
Posted: 15 Aug 2021 14:10
by DoG
alienkidmj12 wrote: 15 Aug 2021 13:47
i just looked mate, that is very small area to solder. how much did you have to scratch and with what :) il need to dig out my mag glasses :) im guessing i solder onto the via first then scratch away at the other end, then solder last bit.
It's huge! You don't even need a microscope. :D
I don't know what they are called in English and I don't know where I got them from. But I took a photo of a couple of them. But you could scratch a bit with a scalpel. You just remove the thin layer of solder mask to expose the ground plane underneath. Just a small bit to get solder in.
Or use a normal through hole resistor like exxos did.
Tool.jpg