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  #1  
Old 03-22-2011, 07:58 PM
Brent Tisdale Brent Tisdale is offline
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Default Help with MPA-100k

I bought an MPA-100k to build a box to convert MIDI CCs to control my wah, and at some point in the future, my Rotovibe, when I get it. However, after hooking everything up, all according to the instructions, and double checked by my dad, a seasoned electrician, when I plug my newly created box in to my moded wah, with a stereo cable my guitar signal sounds grounded out. I can say that on the bright side, The MPAs MIDI works fine, as I can hear it sweep when I waggle the pedal. I've tried unplugging the MIDI cable, and checking for loose connections, but no dice. I'm wondering if I need to run a wire from the jacks to a ground, or something, but I don't know, and my dad can't figure it out either. So HELP! Please.

Also, I'm posting from my phone, so forgive me for any weirdly phrased sentences, my dyslexia can get the better of me if I can't see the whole sentence.
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  #2  
Old 03-22-2011, 09:02 PM
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Hi Brent,

Can you post a sketch of your wiring scheme? This may help to make the source of the problem apparent.
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  #3  
Old 03-22-2011, 10:20 PM
Brent Tisdale Brent Tisdale is offline
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Ok, but there's nothing special, it's wire for wire from the manual. I'll post it ASAP!
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Old 03-22-2011, 11:57 PM
Brent Tisdale Brent Tisdale is offline
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I have a drawing, but I have to scan it. I will post as soon as I have access to my scanner.
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  #5  
Old 03-23-2011, 12:20 AM
Brent Tisdale Brent Tisdale is offline
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Here ya go!
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  #6  
Old 03-24-2011, 04:52 AM
Brent Tisdale Brent Tisdale is offline
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I realized today I had wired the wiper, and the "B" in reverse from the way I had the wah wired, (there's that dyslexia again) so I fixed that, but I still get a real bad hum, so I'm going to buy a daisy chain, and try running both the wah and the MPA on the same power supply to see if that fixes it. If not then I don't know! Fingers crossed!
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Old 03-28-2011, 03:44 AM
Brent Tisdale Brent Tisdale is offline
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Local guitar store was out of daisy chains, so I had to order one! Should be here by Friday! I'll let ya know when I get it!
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Old 04-01-2011, 09:20 PM
Brent Tisdale Brent Tisdale is offline
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Just so you know, I got my daisy chain today, and it worked! No more buzz, or hum, or anything!
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  #9  
Old 04-04-2011, 06:37 PM
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Brent--very glad to hear it!
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  #10  
Old 04-04-2011, 07:20 PM
Brent Tisdale Brent Tisdale is offline
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Thanks! Now it's just a matter of making sure everything I control with it, is on the same power supply! I may get a pedalpower from voodoolabs or at least something like it!
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