Post your questions, opinions and reviews of the MPC1000. This forum is for discussion of the OFFICIAL Akai OS (2.1). If you wish to discuss the JJ OS, please use the dedicated JJ OS forum
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By Sense-A Sun Jan 24, 2021 1:37 pm
allendjp wrote:
I would advise against using that specific battery bank because it doesn't address the required negative voltage rail. DO NOT combine both +/-12V and connect them to to only +12V... people will not be happy.

This is what I meant:
Image

Also, you could regulate voltage with an add on circuit such as this:

Image

Your prototype is impressive. I'm just brainstorming and bouncing ideas off you guys. I am not likely to attempt any of this myself. Too busy restoring another MPC 4000 (LCD and contrast knob and cracked circuit board) plus I have a few keyboards I need to fix (dead keys, bad tact switches, etc.).
By allendjp Sun Jan 24, 2021 11:16 pm
Sense-A wrote:
allendjp wrote:
I would advise against using that specific battery bank because it doesn't address the required negative voltage rail. DO NOT combine both +/-12V and connect them to to only +12V... people will not be happy.

This is what I meant:
Image

Also, you could regulate voltage with an add on circuit such as this:

Image

Your prototype is impressive. I'm just brainstorming and bouncing ideas off you guys. I am not likely to attempt any of this myself. Too busy restoring another MPC 4000 (LCD and contrast knob and cracked circuit board) plus I have a few keyboards I need to fix (dead keys, bad tact switches, etc.).


Thanks! Okay! Whew! I just wanted to clear that up... that's a super important detail. hahah. And yes... with the right circuitry anyone can do a similar mod.

I will advise anyone and everyone that if they were to take on the task, to read up and gain knowledge on power circuits. there's a lot of risk involved especially for a such valuable piece of equipment. the last thing I ever want for anyone is to fry their MPC.
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By inflict3 Wed Feb 24, 2021 12:50 am
Can’t wait to see this for sale!!!
By princessdan Sun Mar 14, 2021 11:46 pm
Hey op if you need a beta tester, I'm comfortable altering my MPC, it came to me as a parts/repair unit, and I've been inside it a bunch of times. If I screw up and it breaks I've got a second 1000, so no tears. I've been doing a bunch of research on how to do this myself, although I was leaning towards an external pack to make it easier. I am probably mere days away from sourcing parts, so I've got some $ to throw at it. Holler back!
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By inflict3 Sat Mar 27, 2021 4:30 am
^^^^^^ naw dude, don’t try and con this guy outta his hard work, just buy the kit. He has been testing it.. ****, ima buy it and will test it for him... I don’t usually call people out like this, but how you gonna come up in here with your first post, like you gonna test some sheet?? Come on b...