Korg Microstation Adapter

Palio · Post by **Palio** » Fri Jul 20, 2012 12:47 pm

Hi. I want to ask how seems Korg Microstation adapter (European, germany or Poland especially). It has 3-pin wall plug, or 2-pin WITHOUT grounding hole? My M50 adapter have 3-pin (2 pins and grounding hole) and when I power on synth I listen ground loop from speakers.
Thanx for reply and sorry for my english.

bradkorg · Post by **bradkorg** » Fri Jul 20, 2012 1:22 pm

It has original Korg KA-350 PSU, DC 9V, 1.7A=1700mA, just 2pin and non grounding.

this:
http://en.euroguitar.com/accessory/korg ... 44671.html
site is wrong with 9V/3000mA

bradkorg · Post by **bradkorg** » Fri Jul 20, 2012 1:28 pm

It is a switching powersupply, which can cause noise when polarity is wrong plugged in, just plug the reverse side L(ive) and N(eutral) to test which gives lesser noise.

And the grounding caused the hum loop?
Use the same/only 1 ground/powerline as your speakers.

Palio · Post by **Palio** » Fri Jul 20, 2012 2:23 pm

Thanks a lot. you helped me
I am now using the same powerline for my monitors and synths, but hum is still here.

bradkorg · Post by **bradkorg** » Fri Jul 20, 2012 2:41 pm

Then you got to find out step by step, what/which device cause the hum loop.
Powersupply line/ground, audio inputs/outputs.
Try the connect just 1 device to the speaker first and just one L/R audio output or test the headphone output, switch the powersupply sides etc.

Just google audio instrument groundloop hum etc. for further real solutions etc.

Palio · Post by **Palio** » Fri Jul 20, 2012 3:58 pm

Hours and hours I spend looking for a solution. Result? I probably have a ghost in my home

bradkorg · Post by **bradkorg** » Wed Oct 31, 2012 9:33 am

Palio wrote:Hi. I want to ask how seems Korg Microstation adapter (European, germany or Poland especially). It has 3-pin wall plug, or 2-pin WITHOUT grounding hole? My M50 adapter have 3-pin (2 pins and grounding hole) and when I power on synth I listen ground loop from speakers.
Thanx for reply and sorry for my english.

The solution about HUM/groundloop is to replace the orignal switching poweradapter with a regulated transformer poweradapter.

The switching powersupply is/can causing these hum/groundloop, by using a real regulated transformer powersupply that is few times bigger and heavier than the switching one, will solve the HUM noise!

Here are some sample's, one with 9v 1000mA will work perfectly with mS.
I have this one with EU plug and it solved the HUM noise with my PC 5.1 speakerset!

http://www.ebay.nl/itm/Regulated-Mains- ... 1e62b9e8fd

http://www.ebay.nl/itm/Y6F-NEW-9V-1-1AM ... 3cc575afa2

You solved the HUM problem?

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