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Topics - artstomp

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1
General Questions / MXR EVH flanger...help !
« on: May 09, 2019, 04:24:20 AM »
I’m trying to repair an MXR EVH flanger for my son’s friend...when powered on, you can hear the LFO sweeping loudly...in bypass mode the sweeping bleeds also. The BBD chip, MN3204 works fine ( i guess ) because as i turn the clock trimmer clockwise all the way, then turn counter clockwise, it is now flanging 100% as it should...no audible changes heard when the bias trimmer is turned in any position.
    But as I reset the power...the flanging was gone, LFO again is heard sweeping loudly again....and when i repeat turning the clock trimmer as describe earlier...flanging now occurs normally.
   As the EVH boards is SMT, there’s not much i can replace. I swapped out an MN3207 as it has the same pin config but has a higher delay stages...just to test somehow if the MN3204 is defective in some way. But same scenario happens with the MN3207. ( tho it “flange” in a different way ).
   Any suggestions where should i look. Tnx in advance.

2
General Questions / Need +12v, -12v on Road Rage
« on: January 30, 2019, 10:34:34 PM »
..Hi y'all....i understand that a 9v input on the road rage will render an 18v and -9v outputs. A 12v input will scale to 24v output, but will i get a -12v on pin 5 of the charge pump?

thanks i advance

3
General Questions / Presence gain on BDI21
« on: January 07, 2019, 08:51:25 PM »
Hi you all folks...my bass player friend has Behringer BDI2 and asking me he needed more on the presence knob and more lower end on over all tone...please advice which resistors/capacitors should be replaced...i know Behringer BDI21 is a copy of the SANSAMP Bass Driver..so here is the schematic of the latter...thank upu guys in advance...

http://guitar-gear.ru/wp-content/uploads/2016/06/Sans_amp_scheme.jpg

4
Open Discussion / Julia Lag control
« on: July 13, 2018, 03:25:33 AM »
..hi everyone..how did Walrus Audio Julia do the LAG control on this chorus pedal...is this based on a MN3007 bbd chip?...tnx

5
General Questions / pignose PGG-200 travel guitar schematic / gut shots
« on: January 24, 2018, 08:53:25 AM »
..hi guys anybody own a pignose PGG-200 travel guitar ?..gutshots and schematic ?
..i have a friend trying to redo the connections..his guitar seem to always in the on mode regardless of the push/pull position.
thank you !

6
General Questions / EHX Holy Grail Gritty Clean Channel
« on: November 04, 2017, 05:33:54 AM »
Hi there!..i'm modding a friend's EHX Holy Grail, the clean mode seems easily get distorted, what resistor(s) should i
replace on the "clean circuit"..tnx

"Clean" circuit


8
Open Discussion / JHS BOSS collab
« on: September 08, 2017, 04:51:26 PM »
..what are your thoughts about this...
https://youtu.be/txuOROqif7Q

10
Open Discussion / Lag control on chorus
« on: January 21, 2017, 08:30:25 PM »
..what does the lag control on the Walrus Audio Julia chirus/vibe does...can i add a similar control on a CE2 chorus?

https://www.walrusaudio.com/products/julia-analog-chorus-vibrato

Tnx

11
General Questions / De Luxe Big Muff
« on: January 11, 2017, 05:00:25 AM »
..is there a De Luxe Big Muff project floating around somewhere ?

12
Tech Help - Etcher's Paradise / SD9 docs link not working.!!!
« on: November 24, 2016, 10:05:28 PM »
SD9 docs link not working..tnx

13
Open Discussion / Tail mod on Boss DM3
« on: September 17, 2016, 07:50:02 AM »
..how would you go about a BOSS DM3 to have a tail mod?..by looking at the schematic my guess is to remove the jfet tansistor connected on pins 10 and 11 of 1571 IC..jumper it then transfer the jfet sw to the input of 1571 IC pin 8...any suggestions from the experts 'round here..tnx in advance..

14
Open Discussion / Mn3006
« on: July 05, 2016, 08:57:08 PM »
..just wondering what will happen if i retrofit an MN3006 ic to MN3007 on a flanger circuit...knowing the MN3006 has a shorter delay time..guyatone ps004 utilizes this ic...tnx for your reply..

15
Open Discussion / a real breadboard..
« on: March 27, 2016, 08:09:10 AM »
..is that a fuzzface?....on a bread board?...lol


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