PDF= http://www.4shared.com/office/aymvM3WZba/DOD_230.html
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Mxr - Noise Gate / Line Driver
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andregarcia57
- Cap Cooler
The scheme has found with some changes of errors in other schematic
someone gives him? is right?
thanks
someone gives him? is right?
thanks
- Attachments
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kdude34567
- Breadboard Brother
Information
- Posts: 57
- Joined: 03 Oct 2014, 08:11
- my favorite amplifier: VHT 2/50/2
ADA MP1
Marshall 1960B cabs - Completed builds: Custom Made Rack Amp & Effects Switcher & Foot Controller
MXR Phase 90: 70s Script mod, '70s Block mod
Restore/Rebuilds: MXR Distortion+, Flanger, Phase 100, Phase 90 MicroChorus, MicroAmp, NoiseGate, Blue EQ10, Mutron Phasor II, ElectroHarmonix PloyFlange, Commande Delay, DOD 250OD, Zeus 8444 Preamp, Thomas Organ CryBaby, Westbury W20 Tube Preamp, Maestro EchoPlex SE1 Sireko - Location: Orange County, California, USA
- Has thanked: 5 times
I know this post was some time ago, but I have an original 1978-1980 grey MXR NoiseGate that hasnt worked for years. I finally got around to repairing it & had some issues. Then I found this thread.
Long story short, is I got it working & it is gating. But I'm having the exact same problem as you guys had that discussed on pages 3 & 4 of this thread. It's where when the gate is engaged it's filtering down or squishing the incoming guitar signal & it's at 1/2 volume & distorted. When the gate is off, the guitar input signal is full level & proper.
It should be noted that I changed a few components on my stock pedal to those discussed in this thread. It wasn't working right before I changed the components & it started gating after I did. Does that mean the original MXR design has some flaws in it? Because the pedal never did work 100% correctly since the day I bought it back in the late '70s as a teenage rock guitarist. Anyways, here the components I changed:
1M --> 1.8K (between JFet gate & 150K)
22K --> 680 (between 5.1V Zener diode & Vcc)
680 --> 4.7K (between -IN of U1 or U1a going to gnd)
1uf --> 2.2uf (same as the 4.7K)
What did you guys finally come up with that fixed the issue?
Long story short, is I got it working & it is gating. But I'm having the exact same problem as you guys had that discussed on pages 3 & 4 of this thread. It's where when the gate is engaged it's filtering down or squishing the incoming guitar signal & it's at 1/2 volume & distorted. When the gate is off, the guitar input signal is full level & proper.
It should be noted that I changed a few components on my stock pedal to those discussed in this thread. It wasn't working right before I changed the components & it started gating after I did. Does that mean the original MXR design has some flaws in it? Because the pedal never did work 100% correctly since the day I bought it back in the late '70s as a teenage rock guitarist. Anyways, here the components I changed:
1M --> 1.8K (between JFet gate & 150K)
22K --> 680 (between 5.1V Zener diode & Vcc)
680 --> 4.7K (between -IN of U1 or U1a going to gnd)
1uf --> 2.2uf (same as the 4.7K)
What did you guys finally come up with that fixed the issue?
Kdude
Lead Guitarist White Lie & Guitar Gods
Musical Instrument/Gear Aficionado, Collector,Trader, Restorer, Repairs
Product Manager/Application Engineer Electronic Security Industry
Techno Geek, Half-Baked Inventor, Wannabe Scientist
Lead Guitarist White Lie & Guitar Gods
Musical Instrument/Gear Aficionado, Collector,Trader, Restorer, Repairs
Product Manager/Application Engineer Electronic Security Industry
Techno Geek, Half-Baked Inventor, Wannabe Scientist
I am figthing with this too, but I think that this resistor shouldn't be replaced. Try to leave it at 22k.kdude34567 wrote: 22K --> 680 (between 5.1V Zener diode & Vcc)
What did you guys finally come up with that fixed the issue?