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Author Topic: KORG MR-1 External Power Source  (Read 11436 times)

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Offline H₂O

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KORG MR-1 External Power Source
« on: July 06, 2007, 06:08:20 PM »
I am going to hook up my new MR-1 to an external battery.  Does anyone know the connector size?

Also does any one know how many mA's or Amp's it will pull on the 5volt power jack?  In the manual it says it draws 2.15 Watts (which I calc to 0.430 Amps at 5 Volts) but does this value take into count any additional current draw from charging the onboard battery?


I want to understand the battery life I can expect and to see what my total current draw against my battery will be.

Also the AC  PS included with the KORG is rated up to 2.4 Amps and I want to make sure the KORG doesn't pull this kind of current when connected to my battery.

I will be using a custom battery setup I have been using for years with a pair of adjustable linear volatge regulators (outputs two seperate regulated voltages from one high voltage battery).   The manufacturer of the battery I have suggests to keep the total current draw under 2 Amps.  I will  also be running a PSP2, which I am pretty sure only pulls between 300 - 500 mA's.

« Last Edit: July 06, 2007, 06:22:45 PM by campbrs »
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Offline H₂O

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Re: KORG MR-1 External Power Source
« Reply #1 on: July 07, 2007, 04:24:23 PM »
The MR-1 Power connector looks like a EIAJ-02 (or Philmore 240 plug/TC240 cord/207 PC jack).  This is the same connector as used on the Sony TCD-D7/8, M1, and D100 - BUT NOT THE SAME VOLTAGE - SO DON'T TRY AND RUN YOUR MR-1 ON A D8 or M1 external battery.


An interesting article on the EIAJ connectors can be found here:
http://en.wikipedia.org/wiki/EIAJ_connector

Also I noticed the PS output is 5.2 V but the unit will run off 5.0 V.  Is there a set voltage where the battery charges (i.e. 5.2 V)?   So if youwhere to run at 5.0 V would it not charge the battery?

« Last Edit: July 07, 2007, 04:28:23 PM by campbrs »
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Offline H₂O

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Re: KORG MR-1 External Power Source
« Reply #2 on: July 07, 2007, 09:46:24 PM »
Well all looks good for me. I was able to run the MR-1 at 5.08 Volts for 5 hours recording DSD on my battery setup and the battery only dropped about 25%. 

Based on my observations I would guess the current draw of under 0.5 Amps is pretty accurate.

Note the onboard battery was fully charged so it did not need to be recharged.
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Offline H₂O

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Re: KORG MR-1 External Power Source
« Reply #3 on: July 08, 2007, 10:07:11 PM »
Well now it doesn't look so good as the MR-1 died on me today on my setup.  I think the culpret is the power connector I am using as it is not an exact match to the Korg's (even though it is spec'd the same).

So off to Radio Shack tommorrow.
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Offline mwz

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Re: KORG MR-1 External Power Source
« Reply #4 on: July 08, 2007, 11:17:20 PM »
my power runner pr2300 has a plug that seems to fit just about right - pulled a nice 4061 > mma600 > mr1 last week.

Offline H₂O

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Re: KORG MR-1 External Power Source
« Reply #5 on: July 09, 2007, 09:23:31 PM »
Thanks for the input mwz. +T

I was able to get this working with my battery finally and with the original connector cable I made many moons ago for my D8.  It appears my battery connector (the connector to the battery) was loose (idiot :) ).   My battery is now working and actually charging the unit.

One issue I did find through all this that when running the MR-1 and PSP-2 off the same power source a grounding issue may occur.  When I run both on the same battery and connect a from the mini of the PSP-2 to the 2 mini's of the MR-1 the PSP-2 will power on with out being turned on.   This will not happen if I run both off seperate external power sources.

So now I am resorting to using internal batteries in the PSP-2.  I have run it this way many times in the past but my PSP-2 battery slide is about as reliable as an AD1000 with a failing clock.  If the contacts aren't exactly positioned the PSP won't power on.
« Last Edit: July 09, 2007, 09:27:01 PM by campbrs »
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Re: KORG MR-1 External Power Source
« Reply #6 on: July 10, 2007, 01:53:49 PM »
Ill admit I know next to nothing about the power stuff, so I follow these threads to a T to make sure I dont fry anything.

Any other suggestions other than the power runner pr2300 set to 5v?

I guess the USB port is just for data transfer and can not be used as a power source?

TIA

Offline bdasilva

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Re: KORG MR-1 External Power Source
« Reply #7 on: July 10, 2007, 03:00:59 PM »
Yes.. the USB is only for data. When you're out of battery it will turn off, plugged in to the usb or not.

Power talk now... I'm going to put together a LM7805 regulator circuit. This will take my 9v battery and regulate it down to the 5vdc we need at an amp max.  I have measured the current draw and this should be enough. The JB3  did draw slightly more current and did have current "spikes" and the 7805 (with caps on the output and a good heatsink) worked fine.  I'll let you know.
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Re: KORG MR-1 External Power Source
« Reply #8 on: July 10, 2007, 03:38:08 PM »
I have a home made (from a friend, not by my hand) converter that takes the Wally World DVD battery down for a MicroTracker voltage (which I am told is the same as the JB3)... could this work with the MR1 if I change the connector on the end out from a USB (or better yet, add an additional output cable)?


Offline H₂O

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Re: KORG MR-1 External Power Source
« Reply #9 on: July 10, 2007, 03:56:17 PM »
I use a LM431ACZ-ND VR which handles upto 3A and can be built to be adjustable.  I have a box with 2 (and very large heat sinks) so this allows me to hook up any voltage (a few volts higher then the voltage I am trying to match) and output 2 seperate voltages at any lower voltage using 2 pots (1 per VR).

http://www.alldatasheet.com/datasheet-pdf/pdf/112285/NSC/LM431ACZ.html

I have CAPs and protection diodes soldered in as well.

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Offline Nick's Picks

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Re: KORG MR-1 External Power Source
« Reply #10 on: July 10, 2007, 04:43:58 PM »
its draw is too heavy to use a 5v VR, that much I know. 
I also use a pr battery to great affect.

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Re: KORG MR-1 External Power Source
« Reply #11 on: July 11, 2007, 02:48:49 PM »
its draw is too heavy to use a 5v VR, that much I know. 

What regulator did you try and use?
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Re: KORG MR-1 External Power Source
« Reply #12 on: July 11, 2007, 04:46:33 PM »
uuuhhh...., the wrong one?  I guess.
I can't recall the part, but its the common RS one I always use for other 5v devices.
1705?

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Re: KORG MR-1 External Power Source
« Reply #13 on: July 11, 2007, 06:37:44 PM »
I believe it's OK to hook up a couple of 7805's in parallel... so then you have twice the capacity.  In theory anyway.  I'm quite sure I read that somewhere... never tried it myself.
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Offline bdasilva

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Re: KORG MR-1 External Power Source
« Reply #14 on: July 11, 2007, 07:11:02 PM »
"I believe it's OK to hook up a couple of 7805's in parallel... so then you have twice the capacity.  In theory anyway.  I'm quite sure I read that somewhere... never tried it myself."

Google that and they all say "Bozo NoNo" 

Doing a test with a 7850 (to220 package) and IF the unit is charged when you start and IF you have a heatsink big enough it works fine. stays warm though.  Power in to the circuit draws 500ma (sitting on the table) and 700ma when it is recording This is all still within the 7805 specs.       I may build a LM2675-5 circuit and try that.

The test continues..
« Last Edit: July 11, 2007, 07:17:15 PM by bdasilva »
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Re: KORG MR-1 External Power Source
« Reply #15 on: July 12, 2007, 05:41:20 AM »
"I believe it's OK to hook up a couple of 7805's in parallel... so then you have twice the capacity.  In theory anyway.  I'm quite sure I read that somewhere... never tried it myself."

Google that and they all say "Bozo NoNo" 

Doing a test with a 7850 (to220 package) and IF the unit is charged when you start and IF you have a heatsink big enough it works fine. stays warm though.  Power in to the circuit draws 500ma (sitting on the table) and 700ma when it is recording This is all still within the 7805 specs.       I may build a LM2675-5 circuit and try that.

The test continues..

Yes, you can parallel linear regulators, but need to add ~1 ohm power resister in-series with EACH output so load sharing occurs correctly.

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Offline dmccabe

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Re: KORG MR-1 External Power Source
« Reply #16 on: July 12, 2007, 11:10:17 AM »
The MOTB Project now has Korg as a "benefactor" :) ... we are getting a MR-1000 and the MR-1.

Looking forward to seeing what people come up with for battery solutions... so we can also post new shows.
We will be doing some extensive testing comparing PCM and DSD.


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Re: KORG MR-1 External Power Source
« Reply #17 on: July 12, 2007, 03:45:03 PM »
yah!!

Offline waltmon

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Re: KORG MR-1 External Power Source
« Reply #18 on: July 12, 2007, 03:53:11 PM »
6 volt external, too much???
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Re: KORG MR-1 External Power Source
« Reply #19 on: July 12, 2007, 04:38:54 PM »
i've been wondering that.
IMO, it would probably work just fine and within the tolerance of the chips.  but...I ain't tryin' it.
:(

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Re: KORG MR-1 External Power Source
« Reply #20 on: July 12, 2007, 05:04:46 PM »
I always got improved performance running my P-1 at 8.0 and it was rated at 7.2.   That was one of the biggest problems with that unit, was people powering it with a 6 volt. You always heard people dissing the P-1...never had the first stop or power issue running the phatter battery.

     I used 2 - 4.5 volt 4 amp hour emergency light batteries to make my 9 volts for the P-1.......That thing would go a whole show , plus into the late night at the hotel for playback.

I don't know how beefy the power system is on the MR-1 though. The internal battery doesn't seem to go very far.
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Re: KORG MR-1 External Power Source
« Reply #21 on: July 12, 2007, 09:41:44 PM »
fyi..  I found a small external Li-Ion battery pack that works with the MR-1 at Frys Electronics.  It's called the Powerbank and costs $60 at Frys.  It has a capacity of 4400mAh (@3.7V).  There's a switch on the Powerbank to select 5V, 6V or 8.4V.  The PowerBank is pretty small (3.3"H x 2.3"L x 0.84"W) and weighs 4.4oz, perfect for stealthing.  It has a charging indicator light and a series of indicator lights showing how much charge is left.  It comes with all types of connectors for cellphones, ipod and other electronic devices.  And a leather pouch to carry everything. The barrel connector labeled 04-D is the closest fit for the MR-1.  I found it to be a bit too tight a fit, so I filed down the yellow tip a bit around the outside of the barrel.  Fits perfectly now.
I recorded a show last night using the MR-1 and PowerBank.  I ran the MR-1 powered off the PowerBank from 7:30pm when the opening bands started til the concert ended at around midnight.  The PowerBank supplied the power for the entire evening.  The internal battery on the MR-1 still showed a full charge.  And there was still enough juice left in the PowerBank to play back the concert on the MR-1 listening through my earphones.   So I'm very satisfied with it so far.  This is more power than I'll probably ever need recording a gig.

Here's a URL link if you'd like more info on the Powerbank.   You can download the manual from the site, too.

http://www.premiumpowerproducts.com/Products/PowerBank.htm

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Re: KORG MR-1 External Power Source
« Reply #23 on: July 13, 2007, 03:03:41 PM »
Yup, that'd be the one.  Not surprised the Powerbank can be found for cheaper online than Frys is selling it for.  It was an impulse buy when I was passing by the aisle of ipod accessories at Frys last week.  I wasn't sure if it would even work with the MR-1, so it would have been easier to return it to Frys which is a couple minutes from me, rather than ship it back. 
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Re: KORG MR-1 External Power Source
« Reply #24 on: July 13, 2007, 03:15:26 PM »
Frys Sucks but it a nessesary evil in Phoenix. Good fingd though... +T
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Re: KORG MR-1 External Power Source
« Reply #25 on: July 15, 2007, 12:18:22 AM »
Is the MR-1 tip positive?   Thanks in advance!

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Re: KORG MR-1 External Power Source
« Reply #26 on: July 15, 2007, 01:08:07 AM »
Is the MR-1 tip positive?   Thanks in advance!

See attached for the back of the power supply included with the deck for all specs


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Re: KORG MR-1 External Power Source
« Reply #27 on: July 18, 2007, 01:26:49 AM »
Ok - I ran the MR-1 tonight at WSP for the first time and it sounds amazing!  I ran into two issues though:

1. The Power indicator only shows the "plug" or "lightning bolt" for about a minute and then it goes back to battery bars, but the battery does not seem to drain.  Is this normal when running off an external power source? 
Ran it using my VR box set to 5.30 V off an Electrovaya PP160.  The Electrovaya went down 20% after about the 3 hours of record time.

2. My right channel cut out 2x - don't know what's going on here as all the cables where tight - i wiggled the 1/8" stereo on my PSP-2 on the first occasion and it came back - on the second occasion I reseated the 1/8" TRS connector on the MR-1 and it came back

FWIW - Ran 13th row ROC (as close to Center as possible) about 7.5" high MK41 > KC5 > CMC6xt > EAA PSP-2 > MR-1

What DSD filter setting should I run?  I ran filter 1

Very sticky sounding!!!  ;D


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Offline Nick's Picks

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Re: KORG MR-1 External Power Source
« Reply #28 on: July 18, 2007, 07:00:41 AM »
psp2>mr1 eh?  I might have to hear that!

problem #1.  no problem.  thats the unit being powered / charged etc .. by the external.  Mine does the same thing.  runs for a long time though, and that is whats key.

#2.  sounds like cable issues to me.
I guess you need to order one from that hydra guy.
::)

here's to another DSDeliceous recording!!!
« Last Edit: July 18, 2007, 07:02:43 AM by Nick's Picks »

Offline Nick's Picks

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Re: KORG MR-1 External Power Source
« Reply #29 on: July 18, 2007, 02:17:26 PM »
sometimes its a matter of current though, and its hard to get that (which is what the MR1 is finicky about) w/o getting a beefier supply.

Personally, when I know a VR will work and 5v is my output....I like to use 7.2v RCs for a source.  if I'm building a 9v > 5v setup, I use a heatsink.

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Re: KORG MR-1 External Power Source
« Reply #30 on: July 18, 2007, 02:35:17 PM »
or your cooking some dogs in your gear bag (and sizzlin' the onions on the apogee).
:)

I have not tested the output of my AC/DC adapter, but i'm pretty sure it outputs 5v.
I would bet that 6v would power it fine...but i'm not going to do that unless I bust it open again, find the chip that handles the incoming power and see what its tolerance is.

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Re: KORG MR-1 External Power Source
« Reply #31 on: July 20, 2007, 12:37:57 AM »
psp2>mr1 eh?  I might have to hear that!

problem #1.  no problem.  thats the unit being powered / charged etc .. by the external.  Mine does the same thing.  runs for a long time though, and that is whats key.

#2.  sounds like cable issues to me.
I guess you need to order one from that hydra guy.
::)

here's to another DSDeliceous recording!!!

On #1 thanks for the input - good to know that I wasn't going crazy :)
On #2 I think the cable between the MR-1 and the PSP is fine - took it apart and looks very solid.  Thinking back when I broke down one of my actives was not screwed in exactly right so I think the issue is here.   I will try again this Sunday at Bethel - I'll keep a set on the HDD and let you listen prior to the show if you would like (since you will be there - I know Carl).

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Re: KORG MR-1 External Power Source
« Reply #32 on: July 20, 2007, 07:09:54 AM »
yea...that'd be great.
:-)
see you there

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Re: KORG MR-1 External Power Source
« Reply #33 on: July 20, 2007, 03:19:42 PM »
I believe it's OK to hook up a couple of 7805's in parallel... so then you have twice the capacity.  In theory anyway.  I'm quite sure I read that somewhere... never tried it myself.

On the whitepapers I have seen for a few linear regulators, they show a way to run high current sources using one regulator.   They accomplish this by using a high current transistor in addition to the regulator.

Check the white papers of the regulator that you choose to use and may be this is a supported option instead of running 2 regulators in parallel.
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Re: KORG MR-1 External Power Source
« Reply #34 on: July 20, 2007, 04:48:24 PM »
or...
just buy a PR battery and be done.
:0

Offline BlackCrowe

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Re: KORG MR-1 External Power Source
« Reply #35 on: November 23, 2007, 05:22:50 AM »
This looks like a good, cheap, neat, small and comfortable option as well...may even have the correct rectangular power plug, maybe someone with both a Korg MR-1 and Sony PSP can check if it fits...

http://cgi.ebay.de/externer-Li-Ionen-Power-Akku-Accu-Batterie-Sony-PSP-NEU_W0QQitemZ120184357068QQihZ002QQcategoryZ100828QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
« Last Edit: November 23, 2007, 05:50:06 AM by BlackCrowe »

Offline swordfish

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Re: KORG MR-1 External Power Source
« Reply #36 on: June 22, 2021, 09:22:13 AM »
Hello,

I hope it is OK that I'm using this old thread!

After years I got my Korg MR1 back, but the internal and an external battery won't charge anymore. 

Unfortunatley the link(http://www.premiumpowerproducts.com/Products/PowerBank.html) won't work anymore, any suggestions which small powerbank I shall buy.

Thanks in advance,

SF

fyi..  I found a small external Li-Ion battery pack that works with the MR-1 at Frys Electronics.  It's called the Powerbank and costs $60 at Frys.  It has a capacity of 4400mAh (@3.7V).  There's a switch on the Powerbank to select 5V, 6V or 8.4V.  The PowerBank is pretty small (3.3"H x 2.3"L x 0.84"W) and weighs 4.4oz, perfect for stealthing.  It has a charging indicator light and a series of indicator lights showing how much charge is left.  It comes with all types of connectors for cellphones, ipod and other electronic devices.  And a leather pouch to carry everything. The barrel connector labeled 04-D is the closest fit for the MR-1.  I found it to be a bit too tight a fit, so I filed down the yellow tip a bit around the outside of the barrel.  Fits perfectly now.
I recorded a show last night using the MR-1 and PowerBank.  I ran the MR-1 powered off the PowerBank from 7:30pm when the opening bands started til the concert ended at around midnight.  The PowerBank supplied the power for the entire evening.  The internal battery on the MR-1 still showed a full charge.  And there was still enough juice left in the PowerBank to play back the concert on the MR-1 listening through my earphones.   So I'm very satisfied with it so far.  This is more power than I'll probably ever need recording a gig.

Here's a URL link if you'd like more info on the Powerbank.   You can download the manual from the site, too.

http://www.premiumpowerproducts.com/Products/PowerBank.htm

Offline jb63

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Re: KORG MR-1 External Power Source
« Reply #37 on: June 22, 2021, 10:45:59 PM »
Hit me up on Friday and I will solve your mr1 needs.

So it doesn’t power up at all right now?
this is definitely not normal

Offline swordfish

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Re: KORG MR-1 External Power Source
« Reply #38 on: June 23, 2021, 01:04:21 AM »
Hit me up on Friday and I will solve your mr1 needs.

So it doesn’t power up at all right now?

It doesp power up with the wall outlet and the transformer. But the internal battery works only for a minute or so, if I pull the transformer plug .  Might need an old battery pack if someone has one collecting dust.

Or a small power bank the size of the MR 1 and a "good" cable to connect the two.


Offline jb63

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Re: KORG MR-1 External Power Source
« Reply #39 on: June 26, 2021, 09:17:22 PM »
That one minute is tough. You can use it to hot swap the battery box that holds 4 AA cells. So you can buy 2 of them and you are adding the weight of 8 AAs to your bag.

https://www.adorama.com/kobatpmr1.html

They are discontinued but it can’t be hard to build one or 2. You can borrow one from me to check it out.

Here’s what you need to find for a usb battery.

https://www.amazon.com/gp/customer-reviews/R2CCS1DKUWF5WT?ref=va_cr_lb

Here it is in Canada. Which is all I could find right now.

https://www.amazon.ca/Tera-Grand-7800mAh-Digital-Display/dp/B00F02UKYE
this is definitely not normal

Offline swordfish

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Re: KORG MR-1 External Power Source
« Reply #40 on: June 27, 2021, 04:20:07 AM »
That one minute is tough. You can use it to hot swap the battery box that holds 4 AA cells. So you can buy 2 of them and you are adding the weight of 8 AAs to your bag.

https://www.adorama.com/kobatpmr1.html

They are discontinued but it can’t be hard to build one or 2. You can borrow one from me to check it out.

Here’s what you need to find for a usb battery.

https://www.amazon.com/gp/customer-reviews/R2CCS1DKUWF5WT?ref=va_cr_lb

Here it is in Canada. Which is all I could find right now.

https://www.amazon.ca/Tera-Grand-7800mAh-Digital-Display/dp/B00F02UKYE

thanks for the info....I will look into the options...I am also looking to buy a used or new sled....contacted Korg and the don't have replacement batteries of sleds in stock anymore.

 

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