jjonas Posted July 23, 2013 Report Share Posted July 23, 2013 (edited) Hi, I have an MB6582 with 4x8580 and 4x6581, and I got myself a stereo noise gate by building two MXR guitar pedal noise gate clones following the schematics on tagboardeffects (I built the stock version with the three changes mentioned in the very beginning) and boxing them up with a dual pot. (UPDATE: If you build this, I advise to use 2N5485 instead of 2N5952 as transistor Q3, as it gives clearly better results. I built a second stereo unit of these today (24.7.2014), and went with the "stock version" schematic (see link above), using a 2N5952 as specified there and believing that that was what I had built before. However my earlier unit was gating the noise much more effectively, and after a while I noticed I had built it with a 2N5485, although it was otherwise like the "unmodded stock version" [bTW at some point I built the modded mono version as well and tried it on guitar, IMO the extra controls didn't really do that much]. Changing to 2N5485 fixed the problem. I don't know why this is though. Here are the datasheets, in case someone feels like researching.. 2N5952 and 2N5485.) (UPDATE 2. March 5th, 2018. I had one more PCB for this lying around it, so I built it today and it worked without any problems. One thing I noticed was that in my screenshot below capacitors C5 and C13 are 100nF, but in the original tagboardeffects layout they're 10nF. However, I've built all mine, including the one today, with 100nF caps and haven't noticed any problems.) The two switches can be used 1) to switch between battery and adapter power (= off for battery power), and 2) to switch off the stereo input jacks' rings to use it in mono (for guitar etc). I'm not sure, but is the second switch actually redundant, as connecting a mono plug into the stereo jacks just connects the rings to ground? I put it there as a precautionary measure to avoid buzz and other problems, but then thought maybe it isn't necessary. Anyway, here's a YouTube video on how it works on a pair of 6581s: http://youtu.be/BKBQBRA9Obw Edited March 8, 2018 by jjonas update info 1 Quote Link to comment Share on other sites More sharing options...
TK. Posted July 23, 2013 Report Share Posted July 23, 2013 Very cool! I will make this topic sticky, because many people asked for a solution in the past, and your approach looks so simple! Also thanks for the video which perfectly demonstrates the advantage. :) Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
tupinamba Posted September 4, 2013 Report Share Posted September 4, 2013 (edited) That's funny 'cause I did exactly the same a few months ago, also using the MXR schematics. I have a single stereo input on one side, and on the other side 2 mono outputs (convenient to plug it to a mixing console) and a stereo pot to control the amount of noise gate reduction. It works really great and it is very simple to achieve, as jjonas said! Of course, it is a bit tricky when dealing with sounds that have important gaps in volume... Edited September 4, 2013 by tupinamba Quote Link to comment Share on other sites More sharing options...
Janis1279 Posted December 18, 2013 Report Share Posted December 18, 2013 Hi, Another simple noise gate schematic - LPM-23 1 channel I been made on a breadboard and tested with the MB6582 with 4x 6581, too. http://hammer.ampage.org/files/LPM-23-NoiseGate.PDF More detailed info about components you can find in Mark Hammer posts in this forum http://www.diystompboxes.com/smfforum/index.php?topic=81918.0 - In the schematic an OP amp pins 3 and 12 are need to be connected to a +5V chain. It's according to a pcb layout. Regards, Janis LPM-23-NoiseGate.PDF Quote Link to comment Share on other sites More sharing options...
mrdave45 Posted February 18, 2016 Report Share Posted February 18, 2016 Hi Jjonas (and everyone else to) Have just ordered some of the pcbs for your noise gate from osh park. I was wondering if there was a component list anywhere to save me having to trace the pcb and match it to the tag board and/or online schematic, which may or may not be the right one! Thanks Dave Quote Link to comment Share on other sites More sharing options...
jjonas Posted February 18, 2016 Author Report Share Posted February 18, 2016 (edited) Hi, first of all, here's a link to the shared OSH park project that mrdave45 mentioned: https://oshpark.com/shared_projects/5LTNNY5l I'm sorry to say I don't have the component list anymore. When I was making the gates, I printed the tagboard layout, counted each component and marked them out with a pencil on the schematic so that I knew which ones were already counted... and I threw away the paper when I was finished. Anyway, here's a screenshot of the Eagle pcb layout which will help you put the components in the right places. The component names don't really refer to anything, I have no list of which component name equals to which value ("R17 = 1M" etc.), so you have to go by the values. Now that I think of it, I'll include a screenshot with just the component values as well, it's probably easier to read. I'm also attaching the Eagle brd file so that you can open it in Eagle to check which value belongs to which component in case the screenshot is too vague. The layout was made in Eagle 6.5.0., in case that can make a difference. A couple of things that come to mind: The pcb has space for trimmers/pots for the modified version of the noise gate (for attack and release), but in the end I didn't find they make much of a difference, so I just bridged them. The noise gate takes regulated 9VDC, so for the regulator at the top I've used a 7809. The input voltage goes into "DC_IN" (upper left corner). The DC pin at the lower right corner ("9VDC") is there for feeding the regulated 9VDC on to a second stereo noise gate that I have. I soldered the resistors R17 and R37 on the "underside". The dual potentiometer goes to SENS1 and SENS2. UPDATE 5.3.18: Capacitors C3 and C15 are 100nF in the screenshot, but they're 10nF in the original tabgoardeffects layout. However, 100nF seems to work without problems (I've built all three I have with 100nF) UPDATE 5.3.18: T1 & T2 and T4 & T5 are matched pairs of 2N3904's, and T3 and T6 are 2N5485's. The ICs are RC4558's. The dual pot is 500k log. I want to remind people that before someone verifies this, I cannot guarantee that this is a good product, worth people's effort etc. I'm not a seasoned pcb designer! That said, everything's worked for me, and I've been using this without problems ever since I first put it together 1–2 years ago or something like that. (UPDATE 5.3.18: I've built one more today, so let's call it verified.) noisegate_tonepad_4_stereo.brd Edited March 8, 2018 by jjonas update info Quote Link to comment Share on other sites More sharing options...
latigid on Posted February 18, 2016 Report Share Posted February 18, 2016 It's possible to export the part list like so: Partlist Exported from noisegate_tonepad_4_stereo.brd at 18/02/2016 21:53 EAGLE Version 7.5.0 Copyright (c) 1988-2015 CadSoft Assembly variant: Part Value Package Library Position (mm) Orientation 1 78XXS v-reg (13.97 50.165) R0 9VDC 1X02 pinhead (46.355 11.1125) R90 ATTACK1 PT-10S pot (6.35 2.54) R0 ATTACK2 PT-10S pot (42.2275 47.3075) R180 C1 47nF C025-024X044 ref-packages (38.735 18.0975) R0 C2 10nF C025-024X044 ref-packages (33.02 13.6525) R270 C3 100nF C025-024X044 ref-packages (28.8925 8.5725) R270 C4 47nF C025-024X044 ref-packages (18.415 14.9225) R180 C5 47nF C025-024X044 ref-packages (13.0175 14.9225) R180 C6 10uF E2,5-5 rcl (41.91 11.43) R90 C7 10uF E2,5-5 rcl (37.7825 7.62) R90 C8 10uF E2,5-5 rcl (25.0825 6.0325) R180 C9 1uF E2,5-5 rcl (20.32 2.8575) R180 C10 1uF E2,5-5 rcl (17.78 19.685) R270 C11 1uF E2,5-5 rcl (11.1125 10.16) R180 C12 1uF/NP C025_050-035X075 rcl (13.0175 22.5425) R180 C13 47nF C025-024X044 ref-packages (9.8425 31.75) R180 C14 10nF C025-024X044 ref-packages (15.5575 36.195) R90 C15 100nF C025-024X044 ref-packages (19.685 41.275) R90 C16 47nF C025-024X044 ref-packages (30.1625 34.925) R0 C17 47nF C025-024X044 ref-packages (35.56 34.925) R0 C18 10uF E2,5-5 rcl (6.6675 38.4175) R270 C19 10uF E2,5-5 rcl (10.795 42.2275) R270 C20 10uF E2,5-5 rcl (23.495 43.815) R0 C21 1uF E2,5-5 rcl (28.2575 46.99) R0 C22 1uF E2,5-5 rcl (30.7975 30.1625) R90 C23 1uF E2,5-5 rcl (37.465 39.6875) R0 C24 1uF/NP C025_050-035X075 rcl (35.56 27.305) R0 DC_IN 1X02 pinhead (2.2225 39.0525) R90 IC1 DIL8 microchip (26.035 16.1925) R90 IC2 DIL8 microchip (22.5425 33.655) R270 IN1 1X02 pinhead (46.355 18.7325) R90 IN2 1X02 pinhead (2.2225 31.75) R90 OUT1 1X02 pinhead (14.9225 2.2225) R0 OUT2 1X02 pinhead (33.655 47.625) R180 R1 22k 0204V resistor (44.7675 4.445) R180 R2 1M 0204V resistor (44.7675 1.905) R180 R3 1M 0204V resistor (41.5925 3.175) R270 R4 1M 0204V resistor (18.415 12.3825) R180 R5 100k 0204V resistor (15.5575 11.1125) R90 R6 10k 0204V resistor (25.0825 2.54) R180 R7 100R 0204V resistor (14.9225 5.08) R180 R8 22k 0204V resistor (33.02 8.5725) R270 R9 1M 0204V resistor (30.7975 5.3975) R180 R10 1,8k 0204V resistor (15.24 7.3025) R0 R11 1k 0204V resistor (39.6875 21.59) R270 R12 2M2 0204V resistor (42.2275 22.225) R90 R13 470k 0204V resistor (42.2275 17.4625) R90 R14 22k 0204V resistor (35.2425 17.78) R270 R15 1k 0204V resistor (26.67 22.86) R180 R16 4.7K 0204V resistor (21.9075 22.86) R180 R17 1M 0204/7 rcl (26.035 16.1925) R270 R18 22k 0204V resistor (13.0175 17.145) R180 R19 100k 0204V resistor (13.0175 19.05) R0 R20 1M 0204V resistor (8.5725 13.6525) R180 R21 150k 0204V resistor (10.4775 6.6675) R0 R22 22k 0204V resistor (3.81 45.4025) R0 R23 1M 0204V resistor (3.81 47.9425) R0 R24 1M 0204V resistor (6.985 46.6725) R90 R25 1M 0204V resistor (30.1625 37.465) R0 R26 100k 0204V resistor (33.02 38.735) R270 R27 10k 0204V resistor (23.495 47.3075) R0 R28 100R 0204V resistor (33.655 44.7675) R0 R29 22k 0204V resistor (15.5575 41.275) R90 R30 1M 0204V resistor (17.78 44.45) R0 R31 1k 0204V resistor (8.89 28.2575) R90 R32 2M2 0204V resistor (6.35 28.2575) R270 R33 470k 0204V resistor (6.0325 33.3375) R90 R34 22k 0204V resistor (13.335 32.0675) R90 R35 1k 0204V resistor (21.9075 26.9875) R0 R36 4.7K 0204V resistor (26.67 26.9875) R0 R37 1M 0204/7 rcl (22.5425 33.655) R90 R38 22k 0204V resistor (35.56 32.7025) R0 R39 1M 0204V resistor (40.005 36.195) R0 R40 150k 0204V resistor (38.1 43.18) R180 R41 1,8k 0204V resistor (33.3375 42.545) R180 R42 100k 0204V resistor (35.56 30.7975) R180 REL1 PT-10S pot (2.54 11.43) R270 REL2 PT-10S pot (46.0375 38.4175) R90 SENS1 1X03 pinhead (33.655 22.5425) R0 SENS2 1X03 pinhead (14.9225 27.305) R180 T1 TO92 national-semiconductor (37.465 13.6525) R0 T2 TO92 national-semiconductor (7.9375 17.4625) R270 T3 TO92 national-semiconductor (20.0025 7.9375) R0 T4 TO92 national-semiconductor (11.1125 36.195) R180 T5 TO92 national-semiconductor (40.64 32.385) R90 T6 TO92 national-semiconductor (28.575 41.91) R180 Z1 5,1V ZDIO-2.5 diode (42.2275 7.9375) R180 Z2 5,1V ZDIO-2.5 diode (6.35 41.91) R0 Quote Link to comment Share on other sites More sharing options...
mrdave45 Posted February 19, 2016 Report Share Posted February 19, 2016 Hey guys. Thanks that's perfect. Quote Link to comment Share on other sites More sharing options...
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