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When is my Q-Tron on?

Discussion in 'Effects [BG]' started by NicJimBass, Apr 18, 2005.


  1. NicJimBass

    NicJimBass Is this thing on!? Supporting Member

    Nov 22, 2004
    Lancaster, OH
    Endorsing Artist: DR Strings, Source Audio, Hipshot
    I know, I know- when I hit the switch. But seriously... I'd LOVE to have an LED let me know when the effect is active, not just powered up. Has anyone had this same desire? I want to mod this so the power LED only comes on when the effect is on. I took a look inside the other day, and it's not too complicated, but I don't want to cross a wire and fry it... so, does anyone have a wiring diagram for this? Thanks!
     
  2. msquared

    msquared

    Sep 19, 2004
    Kansas City
    I'd like to know this too, that'd be a great mod to do. Obviously you can tell by listening if it's on or not, but coming back from a break or something, it'd be nice to have a visual reference.
     
  3. jammadave

    jammadave Rudderless ship Supporting Member

    Oct 15, 2003
    Wash DC metro area
    I just posted one like this for sale in the FS forum - long and short of it is, AnalogMan modded mine that way and it rules. Wish I didn't have to let it go.

    =0)
     
  4. msquared

    msquared

    Sep 19, 2004
    Kansas City
    If you have trouble selling yours because of the mod, I'll trade you for my stock one. :)
     
  5. tplyons

    tplyons

    Apr 6, 2003
    Madison, NJ
  6. NicJimBass

    NicJimBass Is this thing on!? Supporting Member

    Nov 22, 2004
    Lancaster, OH
    Endorsing Artist: DR Strings, Source Audio, Hipshot
    Thanks! I just sent them an email... just have to wait patiently for a response now!
     
  7. msquared

    msquared

    Sep 19, 2004
    Kansas City
    I like that Big Muff mod he does.. but damn, that's pricy.
     
  8. NicJimBass

    NicJimBass Is this thing on!? Supporting Member

    Nov 22, 2004
    Lancaster, OH
    Endorsing Artist: DR Strings, Source Audio, Hipshot
    About how much would this mod run? I left my 'tron on at a show on Saturday, so a light would definitely be nice.
     
  9. NicJimBass

    NicJimBass Is this thing on!? Supporting Member

    Nov 22, 2004
    Lancaster, OH
    Endorsing Artist: DR Strings, Source Audio, Hipshot
    Aright guys, I finally sat down, opened up the ol' 'tron and figured this out myself. I'll try to explain it the best I can.

    The underside of the footswitch looks like this:

    1 2 3
    4 5 6
    7 8 9

    (Each # represents a lug; looking at the switch sideways)

    #7 is wired to the circuit board, #8 is the input (I believe)
    #9 & #3 are wired together
    #1 goes to the circuit board and #2 is the output

    To get the LED to only come on when the effect is on, splice into the LED's ground (black) wire, solder the wire coming from the circuit board to #4, and the wire going to the LED to #5. It's that easy! Have fun!!
     
  10. NicJimBass

    NicJimBass Is this thing on!? Supporting Member

    Nov 22, 2004
    Lancaster, OH
    Endorsing Artist: DR Strings, Source Audio, Hipshot
    bump-

    for those that might need this info
     
  11. junglejim

    junglejim

    Nov 17, 2003
    Norfolk, UK
    Trying to do this mod on my q-tron....
    however my switch only has 6 lugs!!?

    from under with switch top left
    12
    34
    56

    1 and 2 wired together and with blue and purple wires
    3 has a resistor/red wire
    5 has grey wire
    4 and 6 empty

    any ideas?????

    Jim.
     
  12. Smallmouth_Bass

    Smallmouth_Bass

    Dec 29, 2005
    Canada
    I modded mine to have an LED too as well as having a level control.
     
  13. junglejim

    junglejim

    Nov 17, 2003
    Norfolk, UK
    so how is yours wired?
    how did you do it?

    J.
     
  14. Smallmouth_Bass

    Smallmouth_Bass

    Dec 29, 2005
    Canada
    I had someone do it for me, so I don't really know. It was always too loud compared to the dry signal, so the level was really a must. The LED is a little bit dim, but at least I can tell when it's on now!

    The Q-Tron sounds good, but now I prefer my DiscomBOBulator.
     
  15. 343 Salty Beans

    343 Salty Beans

    Jan 24, 2006
    junglejim, if yours is an older model, it may not have shipped 3PDT truebypassed. Your switch is a DPDT...that means that there's 2 columns of lugs, 3 to each column. The middle lug is always connected so when you stomp on the switch, the outer lugs are the ones that are switched. It's basically like 2 independent switches with one button.

    So yours is DPDT bypass - you can view how it works here:

    http://www.diystompboxes.com/pedals/articles/elbypass.html

    3PDT bypass is how the LED is added.

    [​IMG]

    Basically, a 3pdt switch switches 3 independent sets (columns) of poles at the same time. It's how the LED is added. If you want to make your LED switch on and off with the effect, you'll have to buy a 3PDT switch (found at smallbearelec.com) and wire it as shown in this thread:

    here


    There's differences, but essentially its correct.
     
  16. Sir Edward V

    Sir Edward V Not Actually Knighted... Yet!

    Dec 11, 2006
    Massachusetts
    yeah, agreed

    I'm planing on doing this mod myself when I go home for spring break for alas, I have nothing here in college...

    But I can wait.
     
  17. junglejim

    junglejim

    Nov 17, 2003
    Norfolk, UK
    Cheers Salty thats great info...
    my switch looks like this...
    [​IMG]
    this a DPDT???

    will hunt down a 3PDT

    i thought the pedal was true bypass!
    so whats that resistor doing on the output?

    cheers
    J.
     
  18. Herculesdavid

    Herculesdavid

    Feb 28, 2007
    Can anyone clarify how to do the LED mod? I'm really new at this, and did get the 3pdt to work fine,( I had to replace it because my old switch was failing) now I'm trying to do the led mod, but the link above http://www.diystompboxes.com/smfforum/index.php?topic=970.0
    shows a somewhat different circuit. I've tried a couple of different ways, but haven't gotten the LED to work. Do I need to wire the power positive to the terminal of the switch as shown? Right now both terminals of the power input go to the board. Should I just wire a jumper off of the red to the middle top terminal of my switch?

    Also, anybody have any thoughts on the resistor on the output? Mine has one as well..
    thanks in advance for the help. This thread has already been invaluable.

    David
     
  19. junglejim

    junglejim

    Nov 17, 2003
    Norfolk, UK
    this works great for mine....

    [​IMG]
     
  20. Herculesdavid

    Herculesdavid

    Feb 28, 2007
    As the pedal is now, both poles of the power go to the board. the schematic shows the neg going to the input ring, and the other to the board. Did you do exactly this, or just jumper the positive off of the board to your new switch?

    thanks!
    David