MXR - Flanger/Doubler ( M-126 ) [schematic]
- Dirk_Hendrik
- Old Solderhand
Information
Mine suits the application. Thanks mr Tripps!
- sadrew
- Breadboard Brother
i have one of this great sounding delays and unfortunately it has developed a noise issue
i can hear the effect flanging but there is a loud motorboating noise too
the noise disappears in bypass or when the mix knob is in dry position
i already recapped the unit with fresh electrolytics but the noise is still there
i tried to probe the circuit and the noise is pretty much everywhere. i can hear it in the +12V rail as well
on U10 pin 1 there is noise when the regen pot up is turned up. with regen at minimum there is no noise in that point of the circuit
i am trying to narrow the area where the noise builds up but this is a complex circuit for my skills and at the moment i can't figure out a solution
if anyone can help me understanding the schematic and how to nail the problem i would really appreciate
i re attach the schematics for reference
thanks !
i can hear the effect flanging but there is a loud motorboating noise too
the noise disappears in bypass or when the mix knob is in dry position
i already recapped the unit with fresh electrolytics but the noise is still there
i tried to probe the circuit and the noise is pretty much everywhere. i can hear it in the +12V rail as well
on U10 pin 1 there is noise when the regen pot up is turned up. with regen at minimum there is no noise in that point of the circuit
i am trying to narrow the area where the noise builds up but this is a complex circuit for my skills and at the moment i can't figure out a solution
if anyone can help me understanding the schematic and how to nail the problem i would really appreciate
i re attach the schematics for reference
thanks !
- Attachments
-
- MXR M126 Service Schematics.pdf
- (296.78 KiB) Downloaded 243 times
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- Posts: 2
- Joined: 04 Jun 2018, 18:34
Hi everyone! I am new to this site and I apologize for kicking such an old topic. I have one of these units already, and I am absolutely loving it. The one problem with it is that it runs exclusively in Mono. I have two EVH 5150 III Stealth Amps with the same Mesa 4 x 12 Cab and the lead channel with some delay and the doubling effect from the MXR M-126cis simply beautiful. If I run this effect into my two amps, I don't really get true stereo, I just get dual mono. The reason for the long winded introduction is because I have read online the VC inputs are used as voltage control lines to connect two units in tandem. Does anyone have experience doing this? And if so how would I go about connecting these two units together so that they form 1 true stereo unit?
Thanks!
Kiegan
Thanks!
Kiegan
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- Posts: 2
- Joined: 04 Jun 2018, 18:34
I have one of these units and cannot figure out what the CV controls on the back are used for. I am not an electrical engineer and I have been learning slowly what CV is used for in general but I am not sure how it applies to this unit. Over on the Universal Audio website, where they have a plugin for this unit, they say "While the original MXR Flanger/Doubler hardware was mono, CV controls in the rear of the unit allowed two units to operate in tandem." I want to see if I can buy another one of these units and operate it in stereo for my two amp units. That way I can get the flanging sweep effect to be more dramatic and physical.
Anyone have any clue how to go about this? I can't simply connect the CV in of one to CV out of the other and vice versa right? I imagine I would need some sort of controller.
Kiegan
Anyone have any clue how to go about this? I can't simply connect the CV in of one to CV out of the other and vice versa right? I imagine I would need some sort of controller.
Kiegan
- Fender3D
- Cap Cooler
Welcome to FSB mate,kieganlenihan wrote:...If I run this effect into my two amps, I don't really get true stereo, I just get dual mono...
This effect IS mono, it has low and high sensitivity inputs and outputs but they carry the same signal (in different levels of course).
...hmm I think unit1's CV out into unit2's CV in would work....kieganlenihan wrote:...how would I go about connecting these two units together so that they form 1 true stereo unit?
You might connect it from amp1's SEND to amp2's return;
setting the MIX control fully or almost fully WET you get pseudo-stereo sound when effect is engaged and dual mono when disengaged,