Pinout for DB25 I/O connectors?

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bolt
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Pinout for DB25 I/O connectors?

Post by bolt » Sat Aug 27, 2005 6:33 pm

I have an RME and would like to know the pinout for the CV expansion sockets on the back of the synth. Has anyone figured it out?

Alternately, could someone explain why I should need to buy a VX-351, rather than making a breakout cable myself? Are extra electronics required in order to get standard CV voltages out of the voyager, or something?

Does anyone know what the pass-through board that you install between the voyager and the DB25 socket (in conjunction with the VX-351) actually does?


Thanks.

sir_dss
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Post by sir_dss » Sun Aug 28, 2005 12:55 am

Yes at least with the Voyager/351 combo you also have to install another daughterboard in the Voyager as well.

You cheapskate...

Trying to pull a fast one on moogmusic at maybe the worse time ever...

bolt
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Post by bolt » Sun Aug 28, 2005 2:48 am

sir_dss wrote:Yes at least with the Voyager/351 combo you also have to install another daughterboard in the Voyager as well.

You cheapskate...

Trying to pull a fast one on moogmusic at maybe the worse time ever...


Wow, I didn't expect that kind of response..

I'm sorry if my question offended you, but I do think it is a legitimate question..

Since I have the RME, I don't have a use for several of the connections on the expander box. I also don't really want a breakout box that has multiples or an attentuator. I would rather just have minijack patch cords come out of the back.

Additionally, as far as I know, there is currently no expander available for the input connector on the RME; so making my own is the only option.

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Post by OysterRock » Sun Aug 28, 2005 3:11 am

sir_dss wrote:Yes at least with the Voyager/351 combo you also have to install another daughterboard in the Voyager as well.

You cheapskate...

Trying to pull a fast one on moogmusic at maybe the worse time ever...


Geez, a little harsh don't you think? I thought it was a rather innocent question...

sir_dss
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Post by sir_dss » Sun Aug 28, 2005 3:41 am

Yeay I'm sorry it was totally lame of me. I declare myself unfit...

Once again it was wrong of me to be that rude.

dss

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Post by Qwave » Sun Aug 28, 2005 9:26 am

If Moog Music is not publishing it, someone will try to find it by testing the sockets pins one by one. And he/she will publish it somewhere on the internet.
And the tiny little board that needed to be fitted inside the Voyager is populated only by a few decoupling condensators. At least, that is what the board looks like to me when I saw it once. But I am not a technician at all.
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Lengai
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Post by Lengai » Mon Aug 29, 2005 1:45 am

When is the VX-352 supposed to be released?

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Post by punkdisco » Mon Aug 29, 2005 6:01 am

"When is the VX-352 supposed to be released?"

Wow - just searched on the 352 as never heard of it. Did not realise the RME did not get the full quota of CV Inputs..
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music.maker
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Re: Pinout for DB25 I/O connectors?

Post by music.maker » Wed Dec 16, 2015 10:21 am

Was there ever anyone in the past 10 years who figured out the wiring ? Assuming inside it's all passive, probably (hopefully) even not any components, and the DB25 is straight. Since having really true lack of space and not needing 1/4" jacks, thinking about making a DIY 1U rack module with 3.5mm jacks and a few simple small pots for the wheels. Lots fo stuff uses the small jacks now. That will save another 2U and about 600$. A pin out definition of the I (XV-352) and O's (XV-351) would really help. Maybe someone like to open up their XV to see inside. :-)

c7sus
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Re: Pinout for DB25 I/O connectors?

Post by c7sus » Wed Dec 16, 2015 9:45 pm

IIRC this list came from a thread somewhere in the forum here. I have a handwritten copy. Also IIRC I tested these connections way back when. If anybody has corrections or additions by all means modify this list.

VX-351 pinout:

Top Row L>R pins 1-13

1: Common

2: Touchpad Y-axis

3: Touchpad Gate

4: Keyboard Velocity

5: Keyboard Gate

6: Pedal Mod 2

7: Mod Wheel

8: Busses- Pedal

9: Envelope Volume

10: LFO Output- Square Wave

11: S&H Smooth

12: unknown/ not used

13: unknown/ not used

Bottom Row L>R pins 14-25

14: Touchpad X-axis

15: Touchpad A-value

16: * Keyboard Pitch. Not recalling why I flagged this with an asteric

17: Keyboard Pressure

18: Pedal Mod 1

19: Pitch Wheel

20: Busses- Wheel

21: Envelope Filter

22: LFO Output Triangle 8) Wave

23: S&H Stepped Output

24: Noise Output

25: unknown/ not used
Last edited by c7sus on Fri Dec 18, 2015 12:11 am, edited 1 time in total.
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GregAE
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Re: Pinout for DB25 I/O connectors?

Post by GregAE » Thu Dec 17, 2015 7:49 am

I noticed a minor error:

#22 should be "LFO Output - Triangle Wave"
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Rufus the Dog
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Re: Pinout for DB25 I/O connectors?

Post by Rufus the Dog » Thu Dec 17, 2015 8:08 am

I have just added the little board inside my Voyager and the components look very much like SIL (Single In Line) resistor packs/networks. The PCB silkscreen labels them as 'RN' for Resistor Network. My guess they are there to protect the Voyager CV drives from any short circuits that may occur outside the Voyager by putting a smallish value resistor in series....


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MC
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Re: Pinout for DB25 I/O connectors?

Post by MC » Thu Dec 17, 2015 12:13 pm

Rufus the Dog wrote:My guess they are there to protect the Voyager CV drives from any short circuits that may occur outside the Voyager by putting a smallish value resistor in series....


Good guess... being an EE that would be a good protection scheme.

Back in the Trumansburg days, David Borden was a local musician who was invited to play with the modular in the studio at the RA Moog factory. He blew a few modules and was really embarrassed, but the staff told him not to worry. They wanted to know any and all failure modes, and wanted to modify the circuits to protect them. He didn't realize at the time that he was their beta tester.

I'm sure that experience did not escape Bob when he designed the VX-351.
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Re: Pinout for DB25 I/O connectors?

Post by EMwhite » Fri Dec 18, 2015 1:35 am

It's not passive, there is a driver circuit to boost the Pitch CV and a few other components, I never bothered to trace it.

Click on the Flickr! link in my signature for a decent pic of the internals of the VX-351 (and read the description beneath the photo). If you want a higher res photo or a pic of the back, PM me but I would suggest just buying it from Moog or buy a used VX-351. Doing anything else is a fools errand (more trouble than it's worth)
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music.maker
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Re: Pinout for DB25 I/O connectors?

Post by music.maker » Fri Dec 18, 2015 6:06 am

Fantastic to have the ones for the 351. Where is that IIRC ? Is there lot of stuff there? Maybe there is something for the 352 I/O 's (I have an RME BTW)

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