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Author Topic: 13-pin to 24-pin converter...  (Read 301 times)

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susbemol

13-pin to 24-pin converter...
« on: March 11, 2017, 05:10:26 AM »

Hey guys,

I've been looking for a converter that would allow me to use my existing 13-pin guitar with old 24-pin systems. Is anyone aware of anyone making them?

It seems that Wayne Jones is no longer making his box and another one I've come across seems to be excessively expensive for what it is. I think I'd only need the basic string signal (no need for the additional controllers signal) to be converted but I was hoping to avoid having to build one myself.

Any comments or suggestions will be much appreciated.
« Last Edit: March 11, 2017, 08:17:05 AM by susbemol »
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Brak(E)man

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Re: 13-pin to 24-pin converter...
« Reply #1 on: March 11, 2017, 07:18:44 AM »

I want an 24 to  13 , so any suggestions are welcome
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chrish

Re: 13-pin to 24-pin converter...
« Reply #2 on: March 11, 2017, 11:29:50 AM »

There's a roland bc-13 currently for sale on reverb.com, but the seller wants around $700 with shipping.
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Elantric

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Re: 13-pin to 24-pin converter...
« Reply #3 on: March 11, 2017, 01:22:33 PM »

Quote
There's a roland bc-13 currently for sale on reverb.com, but the seller wants around $700 with shipping.

And it would not work anyway

the BC-13 converts 24 pin to 13 pin  - its a one direction interface

same with Waynes versions
http://www.joness.com/gr300/bc13_S.htm
http://www.joness.com/gr300/BX13.htm


the OP wants to convert 13 pin to 24 pin, a clever hacker could review our schematic library and design one
http://www.marksmart.net/gearhack/gr300/analogmods/cablecut/cablecut.html

Wayne Joness used to offer one  ( and TSC / Proix in Japan did too - 20 years ago ) -  - but its essentially a supply vs demand  problem -VERY  few folks are seeking this type interface. after 9 years and nearly 20,000 members  - this is the first time ever heard of a 13 pin to 24 pin interface being requested
« Last Edit: March 12, 2017, 04:24:12 AM by Elantric »
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sec6

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Re: 13-pin to 24-pin converter...
« Reply #5 on: March 11, 2017, 01:40:36 PM »

France comes to the recue!

https://reverb.com/item/4342529-roland-gr-13-to-24-pins-converter-for-gr-300-gr-700-gr-100-gm-70-korg-z3


HOMEMADE GUITAR CONVERTER 13 TO 24 PINS
YOU CAN CONTROL GR-300 GR-700 ......
WITH
YOUR GK-2 GK-2A GK-3....

susbemol

Re: 13-pin to 24-pin converter...
« Reply #6 on: March 11, 2017, 01:48:28 PM »

Thanks, guys. I've seen the one from the gent in France before but at £300+, I was hoping I could find another alternative. His offering is quite a bit more expensive than Wayne Jones' box which was much more fully featured.

Still, I will continue to look for another option and if not, maybe I'll try putting something together myself. Mark's original schematic and plans for this don't look so complicated.
« Last Edit: March 11, 2017, 06:11:57 PM by susbemol »
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Yohanes

Re: 13-pin to 24-pin converter...
« Reply #7 on: March 12, 2017, 04:04:39 AM »

I have successfully convert my G-707 24-pin into 13-pin guitar previously, so you quest more or less the same journey that I have done.

What unit do you want to control, (a GR-300 or GR-700)?

At www.joness.com/gr300/24pin.htm you can see each pin function. It is relative easy to achieve what you want only if you have the 24 pin connector. The cost of the unit you want is mostly because the connector, if you willing to replace the 24-pin connector into 25-pin printer type connector, it may reduce the unit cost significantly, but then you have to mod your unit 24-pin connector.

If you have decided to built one, and want to discuss, I am more than happy to help.
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Re: 13-pin to 24-pin converter...
« Reply #8 on: March 12, 2017, 04:41:30 AM »

I have a gk1 external laying around somewhere , controller , cable , connector and all
I haven't used it ages
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susbemol

Re: 13-pin to 24-pin converter...
« Reply #9 on: March 12, 2017, 02:23:21 PM »

I've already got most of the KORG ZD3 (only without the divided pickup bit) which is the equivalent of a GK1 so I'm hoping that perhaps I'll be able to build an interface box for it.

I plan on using it with a GR-300 if I can eventually find an affordable one (if ever?)!

susbemol

Re: 13-pin to 24-pin converter...
« Reply #10 on: March 16, 2017, 06:38:19 AM »

I am planning to build this little box soon. Could I pick your brains about a couple of details, please?

I am planning to use a GKPX-14 (similar to a US-20 in functionality) made by @CodeSmart which a GP-10 (connected to its GKA input) will provide power for and then use one of the outputs to connect to the 13-pin to 24-pin converter box. It sounds as though the converter will need power to amplify the 13-pin signal so I assume I should still include the -/+15V in the converter box to power the active circuit in here. And also, am I right in that I should not include the +/-15V to +/-7V power conversion or connections back to the 13-pin side?

Mark Smart's original schematic, for reference:

susbemol

Re: 13-pin to 24-pin converter...
« Reply #11 on: March 16, 2017, 07:14:00 AM »

Having thought about it a bit more, I should probably do the voltage conversion as per schematic as you never know if I might want to connect the guitar directly to box, instead of going through the GKPX-14. I think it shouldn't cause any problems since the GKPX-14 will just send those pins to ground.

Sorry for talking to myself for a bit there! :)

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Re: 13-pin to 24-pin converter...
« Reply #12 on: March 16, 2017, 04:17:08 PM »

I think it shouldn't cause any problems since the GKPX-14 will just send those pins to ground.
Sorry for talking to myself for a bit there! :)

"...send those pins to ground through a 1K resistor", is the correct phrase.
It would be ok.
Hex signals (in & out), +/-7V and ground is also available on a 20 pin header inside the box.
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susbemol

Re: 13-pin to 24-pin converter...
« Reply #13 on: March 31, 2017, 10:25:14 AM »

So I thought I had almost finished building this box and everything seemed to be going ok. That is, until I plugged things in and realised that there is no signal (apart from a tiny bit from only the B string which can just about be heard and seen on the GR-300's string LED plus the regular guitar signal) so I must have made a mistake somewhere.

Here is a summary of what I have done:

1) Adjusted Mark's original schematic to reflect the numbers for my cables (in red)
2) Colour coded my 13-pin cables: green for strings 1 to 6, yellow for regular guitar signal and red for +/-7V
3) Checked for continuity of my 24-pin cables using a multimeter to ensure they were working and their numbers are correct
4) Wired everything as per his schematic (and this is where I feel I probably made a mistake)

I think there is also a problem with the way I wired the voltage regulators as I don't seem to be able to adjust the +/-15V to +/-7V using the trimmers. This isn't the most important thing at this stage though since there is +/-15V coming into the box from the GR-300 (checked with my multimeter) and the 13-pin signal is already being powered by the GKPX-14 which also splits the original signal to multiple 13-pin outputs.

I know it is a very big ask to see if anybody could help remotely only from these pictures but can anyone spot anything obviously wrong anywhere? Any help would be much appreciated.

PS: I haven't finished repeating the circuit for the third dual op amp (strings 5 and 6) because I'm waiting for more 10k trimmers to arrive in the post. That's the reason those 2x green and 2x white cables are not connected yet.
« Last Edit: March 31, 2017, 10:27:53 AM by susbemol »
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