Wednesday, March 9, 2016
MXR Noise Gate
Got a request for this one. The schematics that come up with a Google search are all wrong apparently, but it looks like the good people on FSB have figured things out. Here's a link the the discussion and the latest schematic (which this layout is based on) is on page 5. I based this layout on the original layout from MXR, using 2, single op amps. Early versions used the 741 chip, but you can use TL061 or 71s if you want.
yes, my request. thank you so much.
ReplyDeleteawesome as usual!
have you tried it ?
DeleteNo, unfortunately. but i'm planning on doing it next week.
Deleteany update mate ?
DeleteI have built one, i use 2n5457 rotate 180 degree, and i love this, very nice pedal.
Delete2n5457 for 2n5452?
Delete2n5457
Deletei have build it,but it doesn't work, it is humming, can you tell me what's matter?
ReplyDeletei tried the one from Tonepad, seems like they are similar. doesn't work
Deletereport? mate?
Deletewhat components u are using?
any recent updates?
ReplyDeletehi guys, I want to build this project but .. can i replace the 741IC ( UA741CP ) to NE5534 IC ?? Thanks!!
ReplyDeletedatasheet
http://www.alldatasheet.com/datasheet-pdf/pdf/25580/STMICROELECTRONICS/UA741CP.html
http://www.taydaelectronics.com/datasheets/A-250.pdf
An NE5534 is a good replacement for the 741.
DeleteThe circuit works as intended, but why does it cut the sounds coming from the esturman so hard?
DeleteThis a Verified Layout ?
ReplyDeleteyes work very good !!!
DeleteI have tried it and found a mistake. Pins of Q2 are ordered in the wrong way. It should be SDG, not DGS. So change two pins of the transistor, it works great..
ReplyDeleteAnd you can use BF245C for 2N5952.
Deletei followed your suggestion, and didn't work
DeleteThe pinout indicated in the layout is correct. See the datasheet for the 5952.
Deletehttps://www.fairchildsemi.com/datasheets/2N/2N5952.pdf
no invert nothing !!! work very good like that !
DeleteCan i use j201 por 2n5457 instead of the 2n5952???? Thanks
ReplyDeleteI think those should work.
DeleteI have done the tonepad version more than 10 times and I have not had problems, some values are wrong I have videos on my youtube page of this pedal running at 100%, no transistors are needed
DeleteMatched, no special capacitors are needed, this pedal does not need anything special, just having the correct values
Look at the demos on my channel, excuse my English, I only speak Spanish https://www.youtube.com/watch?v=tq_GotkLN5k
Hi, have the PCB and layout be amended to reflect Göktürk's findings of SDG 'round the wrong way?
ReplyDeleteThat transistor is oriented correctly. See comment above.
DeleteAll, it seems this is a problematic circuit for the DIY community–on this blog and elsewhere. If you build it there's a good chance your troubleshooting skills will be tested. Here's the schematic the layout is based on for reference.
ReplyDeletehttp://s33.postimg.org/c3opxdipr/mxr_noise_gate.gif
hello The layout of tonepad noise gate 2 has certain errors which must be corrected in the following way:
Delete1) Input resistance is 10K (not 1k) Input cap is 10n (not 47n)
2) The famous unpolarized cap of 1uf is not such in the original is 10n
3) The cap of 10uf that is between the R of 1M going to vb and that of 22k that leaves the emitter of q1 is inverted goes with the (+) side towards the fet (as it is in the layout).
4) The output cap is 10uf (not 1uf).
5) use the FET 2n5485 (see the datasheet and place it correctly) and two 2n3094 (do not check the hfe, any one serves)
6) The potentiometer of the first noise of the video is logarithmic so it fits faster, the second one is not so the adjustment must be more precise, it does not take more than 5 seconds to leave it ready, both work the same
7) The noise gate pedal of this model (in others it varies the position like the dod fx30) must go after the distortions and before the effects, the noise gate works best in that position
9) IMPORTANT: USE A 6.2V ZENER IN4735 DIODE, WITH THE 5.1 DOES NOT WORK
9) The mods do not work, I have tried them and they are not recommended for a musical use, they reduce volume and cause the pedal to work strange and does not comply with the noise gate function, you are free to experiment but I save you the work
10) In my experience doing pedals many schemes have intentional errors maybe so that the brands can protect their products and make it difficult for someone to clone them, I have seen volt transistors, inverted operations, unspecified resistances etc, in schematics and layouts so it is not Surprise that tonepad has modified it a little to not interfere with the rights of MXR knowing that at some point people would realize that corrections to achieve amr the pedal
For me all is ok !!! works very good as the layout is !!!
DeleteFor me it is verified !!!!!!!!!! No change nothing ! ALL COMPONENTS ARE OK !!!!
and about the zener work good with 5,1 V !
Deletethank you! Seems like this one will be a challenge. One thing is that the 2N3904s should be matched.
ReplyDeletedon't need matched 2N3904s !
Delete"Thresh"? what is it?
ReplyDeletethreshold
Deleteupdate?
ReplyDeletestill cant make mine work
Hello ! What should be the size of board Thanks !
ReplyDeleteHello ! What should be the size of board Thanks !
ReplyDeleteThis scheme is checked? And it is working?
ReplyDeleteI think the hfe on the trannies should be matched, doesn´t matter the value, just matched. I had problems with the tonepad one and that was the issue. Try it!
ReplyDelete
DeleteI have done the tonepad version more than 10 times and I have not had problems, some values are wrong I have videos on my youtube page of this pedal running at 100%, no transistors are needed
Matched, no special capacitors are needed, this pedal does not need anything special, just having the correct values
Look at the demos on my channel, excuse my English, I only speak Spanish https://www.youtube.com/watch?v=tq_GotkLN5k
There is a Polish version with 1 IC that seems to work properly. I tried this page's layout twice without success... , so I think I'll try this Polish fixed one and let you know. The layout is not as glamourous as this, but with a couple fixes I think I'll mount it. I'll let you all know!! Cheers
ReplyDeleteVerified the perfboard layout. https://youtu.be/ZOm0D_rBFno
ReplyDeleteReally? All of us were failed before. Any mod?
DeleteNone. The FET I used was a 2n5485 I think.
DeleteFunny, if that number on the 741 chip with the square notch in my video is a date code, its older than I am. It hasn't seen life in decades!
Apparently is working fine the perfboard layout, the only change i made was the recommendation on the Zener, i used a 6.2V zener instead of the 5.1v. An also i check all the recommendations from Dan are applied on this version but the zener one.
ReplyDeleteForgot to say i also use 2n5485, just inverse the transistor.
DeleteIf we wanted to add an LED where could we put it into this circuit so it goes off when not gating and on when gating? Thanks for all the layouts they are awesome!!
ReplyDeleteYou're going to have to give that one a Google, cuz honestly, I have no idea. haha
DeleteInstead of using a SPDT switch, you should use a DPDT switch. make the same connections.
DeleteYou could even use a 3PDT switch to use a bypass as well
DeleteFor me all is ok !!! works very good as the layout is !!!
ReplyDeleteFor me it is verified !!!!!!!!!! No change nothing ! ALL COMPONENTS ARE OK !!!!
I have to build it.
ReplyDeletebuilt mine as per the diagram and no success. Swapped the 2n5952 for a j201 and it works beautifully
ReplyDeleteIt's verified. Really work's! The best simple gate.
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ReplyDeletehello, this schematic is corret ?
ReplyDeletehttps://uploaddeimagens.com.br/imagens/noise_gate_correct-jpg
Why is mine that sounds loud in its 3pdt plug. How to get rid of it. PLEASE HELP ONCE
ReplyDeleteCek link general layout notes utk wiring
DeleteMine works fine. For those having problems with the fet try J118.keep on rockin'.
ReplyDeleteJun from Philippines
Could somebody please write the (ICs/jfet/Transist) voltages, I have some problems here. I am using 2N5457 (I put sockets for the jfet and the 5.1V zener).
ReplyDeleteThis comment has been removed by the author.
DeleteNevermind after debuging now is working perfect.
DeleteWhat I used:
Pot A250K (better control than A500K)
Jfet 2N5457 / 2N5457 (both worked)
Zener 5.1V (1/2 Watt - important)
2N3904 hfe 328 (both)
What if it’s 1W instead of 1/2W?
DeleteTe felicito
ReplyDeleteGracias, igual sigo haciendo pruebas. Siempre hay algo que mejorar, hasta el momento bastante bien.
DeleteMine worked perfectly. I used the jfet MPF102 (rotated) and for the dido 5.1V I used the 1N4735.
ReplyDeleteThat diode is 6.2V
DeleteNow let’s get ISP
ReplyDeleteDecimator G string
Can someone tell me, if this layout is correct and working as it is or not? Also, on which schematics is this based on? Page 5 on FSB is not available.
ReplyDeleteAlmost got this one built But cant find that damn transisitor! The 2N5952 .. reading back up people are saying the J201 works instead.. is this verified to do so.. coz i got this thing built to what the diagram shows looks great , my soldering is getting much better haha.. just i bought a 100 piece transistor kit and doesnt have that one but i got J201s.. im about 95% done just I that one trannie!
ReplyDelete