TB60XG, enhanced Yamaha DB60XG based MIDI module

Discussion about old sound cards, MIDI devices and sound related accessories.

Re: TB60XG, enhanced Yamaha DB60XG based MIDI module

Postby PARUS » 2019-7-01 @ 00:06

Thank you so much!!! This daughterboard is magnificent!
The only thing that I couldn't get is LINE IN ADC. It doesn't work, I don't hear anything. Prompt please how to do it. One of the main things why I have bought this board is a sane healthy ADC with separate input.

Thank you again!
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Re: TB60XG, enhanced Yamaha DB60XG based MIDI module

Postby Tiido » 2019-7-01 @ 06:58

....Aaand this is all my fault, I have done mistake on the new revision and it has completely slipped my radar. The ADC is slave to the DB60XG and it is also 3.3V and needs its signals level translated before they can enter the ADC. LRCLK, BCLK and MCLK were done right but what wasn't is SDATA which was connected the same way as others, but that isn't gonna work at all...
A wire needs to be soldered from Pin1 of ADC enable/disable jumper to 74LVC08 pins 4 and 5 as seen here :
Image
Image

New board version is made now and I will order more boards sometime this month and I will do a board swap or this fix for anyone who has got these boards from me at no cost. New boards will take a while before I get them, I have some other things that I need to finish first so that I can order multiple things at the same time to save on shipping and import costs.

I'm really really sorry for the inconvenience this has caused...
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Re: TB60XG, enhanced Yamaha DB60XG based MIDI module

Postby PARUS » 2019-7-01 @ 08:03

OK, I think so: I will not resend far away for solder one wire of course, I'll try to decide this problem here. And there is no any sense to swap PCB because of one little mistake which can be fixed easy :-P (isn't it?).

BUT: if new PCB revision has separate LINE IN connector (or 5-pin OUTPUT+INPUT+AGND connector) I'll send my sample to swap it with the great pleasure! I very want normal elegant input/output connectors, not wires soldered to waveblaster header :)

Thanks for the quick meaningful answer!
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Re: TB60XG, enhanced Yamaha DB60XG based MIDI module

Postby Tiido » 2019-7-01 @ 12:34

It shouldn't take much effort to add that wire. Make sure not to use the jumper anymore, or it will short the signal and result is no sound once again.

There's no plans to have an additional line in connector (I don't have space for it) but there could be two extra holes next to line-out connector to allow 6 pin connector to be placed instead of it, the outer pins can then be line in. For most cases I'd use normal 4 pin connector for line out only, but for special case there can be 6 pin connector that does both in and out. I'll have to see if there's a clean way to route the line in signals to it without interfering with other signals...
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Re: TB60XG, enhanced Yamaha DB60XG based MIDI module

Postby keropi » 2019-7-01 @ 14:28

I will also just solder the patch wire, it's not a big deal and it won't look ugly
I see no point sending the card back and have the ICs endure a couple of extra heat cycles - patch makes it look better LOL
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Re: TB60XG, enhanced Yamaha DB60XG based MIDI module

Postby PARUS » 2019-7-01 @ 15:35

Tiido wrote:It shouldn't take much effort to add that wire. Make sure not to use the jumper anymore, or it will short the signal and result is no sound once again.

I do not understand. If I add this wire I get ADC working as constant and the ADC switcher will become invalid. Right? And if I want (when it is necessary) to disable analog noise on the output I can't do it. Right? This is unacceptable. If so prompt me please another mod which can save ADC switcher. Thank you.

PARUS wrote:or 5-pin OUTPUT+INPUT+AGND connector

Tiido wrote: there could be two extra holes next to line-out connector to allow 6 pin connector to be placed instead of it, the outer pins can then be line in

It doesn' matter 5 or 6, 1xAGND or 2xAGND. Will it be on new PCB or not?
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Re: TB60XG, enhanced Yamaha DB60XG based MIDI module

Postby Tiido » 2019-7-01 @ 17:22

ADC cannot be switched then. But it isn't necessary, output of ADC is not mixed into DAC by the 44 pin chip, but instead it is turned into special ROM sample that will only ever find its way to DAC output if right sysexes are sent. So the switching jumper is not necessary at all, and it isn't present on new version.

I won't be able to add 6 pin connector to the new version, there's no way I can route the line in signals without compromising couple other more important things.
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Re: TB60XG, enhanced Yamaha DB60XG based MIDI module

Postby PARUS » 2019-7-01 @ 20:40

OK, I understand now that ADC switching off makes no sense at all. And PCB swap makes no sense at all too.
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Re: TB60XG, enhanced Yamaha DB60XG based MIDI module

Postby PARUS » 2019-7-04 @ 08:00

If I knew all this earlier, I never would ask to do my current mod. But now I will change it as follow.

First, cut two ways to 1st and 2nd pins:
1.jpg

Second, place and solder wire between chips directly:
2.jpg


Third, remove "LINE IN" wires from 4-pin "LINE OUT" connector and solder them to 1st and 2nd pins:
3.jpg

Fourth, repair AGND on "LINE OUT" connector.

On new LINE IN connector it will be DGND but I think it won't be fatal. Am I right?
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Re: TB60XG, enhanced Yamaha DB60XG based MIDI module

Postby keropi » 2019-7-04 @ 08:40

^ ok I am officially confused... what the TB60XG is supposed to do that it doesn't so you regret it?
I also have one and it works fine and has more quality and features than the original XR385 daughterboard that is prone to just die... did a feature from XR385 did not make it or is now broken?!
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Re: TB60XG, enhanced Yamaha DB60XG based MIDI module

Postby PARUS » 2019-7-04 @ 08:56

keropi, I agree with you absolutely, I'm in love with TB60XG! I just want LINE IN and find out what it can. That is all.
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Re: TB60XG, enhanced Yamaha DB60XG based MIDI module

Postby Tiido » 2019-7-04 @ 09:28

You could repurpose the ADC jumper pins for line in connector but it uses DGND not AGND so there may be noise due to that.
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Re: TB60XG, enhanced Yamaha DB60XG based MIDI module

Postby keropi » 2019-7-04 @ 11:10

PARUS wrote:keropi, I agree with you absolutely, I'm in love with TB60XG! I just want LINE IN and find out what it can. That is all.


ah OK :cool:
I have no need for it so I had no idea , I just use it for gaming
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