Mxr - Noise Gate / Line Driver

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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.Mike
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Post by .Mike »

I have an 80s model block logo MXR Noise Gate / Line Driver.

I can take gutshots in about 1/2 hour if you want.

Mike
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analogguru
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Post by analogguru »

I have an 80s model block logo MXR Noise Gate / Line Driver.

I can take gutshots in about 1/2 hour if you want.
This would be very nice.

analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.

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.Mike
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Post by .Mike »

Sorry about the crummy lighting. It's dark out on the east coast, and my camera takes terrible flash photos.

http://www.americasdebate.org/MXR-NGLD/

I hope that helps!

Mike
My website: America's Debate | My effects site: Just one more build...

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analogguru
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Post by analogguru »

Very good pictures.....
One picture frontal from the back of the XLR-jack (from inside the case) would make it perfect.

It appears to me that the violet wire is connected to pin 3 (middle lug) and the other 2 pins are connected together - but I am not 100% sure.

analogguru
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Post by .Mike »

Will do after dinner... :)
My website: America's Debate | My effects site: Just one more build...

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.Mike
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Post by .Mike »

Added #9 - 13. Hopefully that covers what you need. If not, let me know. :)
My website: America's Debate | My effects site: Just one more build...

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borislavgajic
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Post by borislavgajic »

:applause: thanks .Mike :thumbsup

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analogguru
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Post by analogguru »

Perfect !!!
With this I can finish the schematic in the next couple of days.

BTW, your unit appears to be from summer 1980, but I couldn´t find any difference to the script-versions.

thanks again,
analogguru
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Post by andregarcia57 »

analogguru wrote:All schematics on the web concerning the MXR Noisegate are wrong including the one from tonepad. Referring to version 2 from 2003 (which I have on my HD):

- Input cap is in reality 10n input resistor 10k.
- The 10µ electrolytic between the 22k and the FET is drawn in the wrong direction - plus should be on the Fet-side.
- Output cap is 10µ instead of 1µ.
- the capacitor before Q2 in parallel to the 100k is a 10n instead of a 1µ.

The source of the FET is connected to U/2 and the drain to the 10µ electrolytic

analogguru
I put up this tonepad pedal mxr noise gate, and he is not working correctly, you could post schematic correct?
I thank you for your contribution.
André
Attachments
mxr noise gate schematic tonepad
mxr noise gate schematic tonepad

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HEAD
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Post by HEAD »

Yeah, that would be great! Even more, if someone could make an updated/corrected layout for it (although there much better solutions out there - but all of them as far as I know are much more complicated) - which could be based up e.g. on the Tonepad layout. Since such simple noisegate projects are pretty rare out there.

Regards
HeAd

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Post by Nikifena »

Here it is.


Thanks analogguru!
Attachments
MXR-pcb.jpg
mxr-noisegate.JPG

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Post by analogguru »

Input resistor is still the wrong value (1k) - should be 10k.
Input cap the same: the drawn 47nF is in the original unit only 10nF.
Output coupling cap the same: 1µF after the opamp should be 10µF to match the original unit.

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Post by Nikifena »

^ hm, sorry.
I don't think, that 10k - 10nf and 1k - 47nf have a big difference. Also 47nf is better for bass responce (when bass guitar is using). Output cap can be between 1 and 10uF.

I make this noice gate, but I have one problem. When I play on low strings - A and E string I have some bad sound - like hrrrr or small overdrive.
I check everything with a scope. I have a clean signal after Q1, but after 22k between Q1 and next to fixed 10uf cap I have a scratched signal. I put 33pf between 1meg resistor in the feetback at IC1a, but this doesnt fix it. Also I change a few fets.

Any ideas how to get a clean signal at the output ?

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Post by Güero 2.0 »

Hi, thanks to everyone that help me to build this unit.
I am use the actual layout and wiring for Line connector.

Image

Image

Image

Image
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Post by audioguy »

Güero 2.0 wrote:Hi, thanks to everyone that help me to build this unit.
I am use the actual layout and wiring for Line connector.
Beautiful build! What layout did you use?

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Post by Güero 2.0 »

audioguy wrote:
Güero 2.0 wrote:Hi, thanks to everyone that help me to build this unit.
I am use the actual layout and wiring for Line connector.
Beautiful build! What layout did you use?

I used my own layout and the Tonepad schematic.
"Come squeeze and suck the day.Come Carpe Diem baby!"

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Post by audioguy »

Güero 2.0 wrote:
audioguy wrote:
Güero 2.0 wrote: I used my own layout and the Tonepad schematic.
Care to share? :P

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Post by slash555 »

Güero 2.0 wrote:
audioguy wrote:
Güero 2.0 wrote:Hi, thanks to everyone that help me to build this unit.
I am use the actual layout and wiring for Line connector.
Beautiful build! What layout did you use?

I used my own layout and the Tonepad schematic.
layout please :D
a built one from tonepad layout bud it doesnt work. i really want noise gate :)

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Post by ebuprofen »

Hi guys
Can anyone tell me how to add GATE LED to this circuit?

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Post by Brainbender »

I've found this:

Image

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