VG-99 - Can a VG99s RRC2 provide power to a TC GMinor?

Started by amagalma, May 05, 2016, 09:15:48 AM

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amagalma

Hello!  :)

I would like to power my TC G Minor from my VG99's RRC2 port. The G Minor needs 9V DC (negative inside) - 2W (which I think is about 222mA - correct me if I am wrong, please!)

My questions are:
1) Will the RRC2 port of the VG99 provide enough power?
2) How should I connect the plugs to the cable? The cable will have an RJ45 plug on one side and a standard 2.1mm barrel powerplug.

Thank you in advance for your help! :)


sixeight

The power supply of the VG99 is also 2 watts. 2 watts equals 2000 mW. So in theory you do not have enough power. I doubt the guitar minor really consumes that much power though.

EDIT: VG99 power supply is 2 amps = 18 watts. My bad.

I have used the RRC2 connector to power an FCB1010, which was not problem. Check out https://www.vguitarforums.com/smf/index.php?topic=783.10 for a pinout of the RRC2 connector and schematic of this solution.

Also I have done the same for my VController, which uses even more power. Also no problems here. Check out  https://www.vguitarforums.com/smf/index.php?topic=15154.msg125923#msg125923 for more information.

Elantric

FWIW -

http://cdn-downloads.tcelectronic.com/media/667690/tcelectronic-gminor-manual-english.pdf

Note the G-Minor power supply at 2Watts is designed to run multiple G-Minors


I suspect less than 500mA @9VDC is required for running one  G-Minor

sixeight

The manual does state 2 watts, but that is an awful lot for a simple midi controller. I think they use only one type of power supply that will suit many more products. It will make it cheaper because they can order more and keep less I need stock worldwide.

BTW You can even run MIDI through the RRC2 connector. I do the same with the VController.

amagalma

Thank you for your responses!  :)

2W=2000mW

2000mW/9V=222mA

The power supply of the G Minor is 9V, 300mA.

So the question is: can the RRC2 port provide at least 222mA?

Elantric

QuoteSo the question is: can the RRC2 port provide at least 222mA?
We know VG99s RJ-45 "RRC2" port can power the Roland FC-300  - that draws 94mA
http://cdn.roland.com/assets/media/pdf/FC-300_OM.pdf

I believe it should also be able to power the G Minor

Find details here
https://www.vguitarforums.com/smf/index.php?topic=783.0
https://www.vguitarforums.com/smf/index.php?topic=28.msg3604#msg3604
http://www.naslada.net/knowhow/fcb1010/FCB1010%20Phantom%20Power%20Adaptor.pdf
Download everything here:
https://www.vguitarforums.com/smf/index.php?topic=30.0
https://www.vguitarforums.com/smf/index.php?action=dlattach;topic=30.0;attach=236


The RRC2 Ethercon RJ-45 pinout is
========================
1 = RCV_1
2 = RCV_2
3 = +5VDC
4 = +VREF
5 = +VREF
6 = TXD
7 = GND
8 = GND
SHELL = GND

Internal VG-99 RRC2 connections


amagalma

Ok. I can make the cable and see if the current is enough or not..

How should I wire the cable? I understood that I must use pins 5 and 7 on the RJ45 side.. But where do I connect them on the 2.1mm barrel powerplug side? The negative must be inside and the positive outside...

Elantric


amagalma

In case I was not clear, I do not intend to make a MIDI cable that gives power to the G Minor, as was done in the example above with the FCB1010. I simply want to power the G Minor with a special made cable that will draw current from the RRC2 port. I want to do that in order to have one less power supply to carry.
That special cable will be a RJ45 plug on one side and a 2.1mm barrel plug on the other.

sixeight

Quote from: amagalma on May 05, 2016, 10:58:20 AMHow should I wire the cable? I understood that I must use pins 5 and 7 on the RJ45 side.. But where do I connect them on the 2.1mm barrel powerplug side? The negative must be inside and the positive outside...

Pin 4 and 5 are positive and pin 7 and 8 are negative. Make sure you test the polarity before connecting the G minor.

amagalma


amagalma

Just to let you know, I did it and it works fine!  ;D

Thank you very much for your help!  :)

Elantric