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HELP!! DIY PROJECT, needs help

Discussion in 'Effects [BG]' started by cathal, Aug 16, 2007.


  1. cathal

    cathal

    Mar 21, 2007
    London, England.
    I am building a DOD 250 pedal

    this is my first build

    i have soldered everything and hooked it all up

    but the LED is on all the time and there is only sound when it is bypassed

    here are some photos to help (sorry for the quality:meh:)

    DSC00367.

    DSC00368.




    please give me any help or suggestions you have

    thanks

    cb
     
  2. bongomania

    bongomania Gold Supporting Member Commercial User

    Oct 17, 2005
    PDX, OR
    owner, OVNIFX and OVNILabs
    Well, first thing I would do is re-check the connections to the footswitch, and make sure you're adjusting correctly if there is any difference between the switch you're using and the one shown in the plans/schematic you're using.

    Also, make sure none of those component legs is touching each other. :)
     
  3. cathal

    cathal

    Mar 21, 2007
    London, England.
    thanks

    ive just checked and there are no touching components

    ive checked the footswitch and still it is the same

    ive even disconnected the footswitch and there is no sound but an LED on
     
  4. 343 Salty Beans

    343 Salty Beans

    Jan 24, 2006
    Check your footswitch connections with a multimeter beep test to ensure the footswitch isn't faulty. If it's not that, then it could only be attributed to faulty wiring, methinks.
     
  5. cathal

    cathal

    Mar 21, 2007
    London, England.
    ive taken the footswitch out and tried it and it still dont work

    so it is the wiring...

    could it be something to do with grounding as i have not grounded anything properly
     
  6. bongomania

    bongomania Gold Supporting Member Commercial User

    Oct 17, 2005
    PDX, OR
    owner, OVNIFX and OVNILabs
    :rolleyes: Yes, that might have something to do with it. All voltage is relative to ground; no ground at some at some part of the circuit = no voltage there.
     
  7. sonicvi

    sonicvi

    Jun 10, 2005
    Houston, TX
    well, yeah, if you don't ground everything that needs to be grounded then there's a good chance it's not gonna work.
     
  8. cathal

    cathal

    Mar 21, 2007
    London, England.
    if i dont have a case where can i ground it too?

    (sorry for the noob questions :s)
     
  9. bongomania

    bongomania Gold Supporting Member Commercial User

    Oct 17, 2005
    PDX, OR
    owner, OVNIFX and OVNILabs
    Try connecting all of your ground points to a single wire; then connect that wire to the ground pin of your output jack. That way everything is grounded to your amp, and presumably thence to the earth of your house via the power line.
     
  10. sonicvi

    sonicvi

    Jun 10, 2005
    Houston, TX
    Don't forget to ground your input jack as well.
     
  11. aborgman

    aborgman Supporting Member

    Jun 12, 2007
    Ypsilanti, MI 48197
    ...and your ground side of your power supply.

    --
    aborgman
     
  12. cathal

    cathal

    Mar 21, 2007
    London, England.
    where do i ground the input jack to??
     
  13. I was going to suggest connecting all grounds to one wire to output jack. Except th battery ground put it to the input jacks (stereo jack?) ring or ground if a mono jack.

    Connect both jacks grounds together.

    MM
     
  14. cathal

    cathal

    Mar 21, 2007
    London, England.
    i have tried all that and still no sound

    all i can hear is the crackle sound of the pots when i twist them
     
  15. cathal

    cathal

    Mar 21, 2007
    London, England.
    i have tried all this but still there is no sound

    when i switch the effect on and off the led stays on but there is no sound at all
     
  16. Hearing scratchy pots means that you are getting a signal between the pot and the output. HOORAY for that. Your problem is somewhere in the first part of the circuit.

    I'm betting its in the switch wiring. You using a 9 pin 3pdt? Get that working first. If your LED is on all the time than it sounds like you've got a short somewhere. Are you measuring around the circuit with multimeter?

    The best thing to do in this situation is to log on to diystompboxes.com and start a thread there. Make sure you read this first. Its really difficult trying to help out when we dont know much about what you've done.
     
  17. Sir Edward V

    Sir Edward V Not Actually Knighted... Yet!

    Dec 11, 2006
    Massachusetts
    AHHHH is it a monster?? :meh: :D

    Step 1: double check your schematic with what you did
    Step 2: Repeat step 1
    Step 3: repeat steps 1-2
    Step 4: get back to us

    might sound arrogant, but that really is the best way to find what is wrong. You need to check that you put the right resistors in the right places, the right caps in the right places, make sure you didn't reverse the direction of any polarized caps or diodes, etc., etc.

    take your time when checking too, don't rush through it
     
  18. Come to think of it..... I'm going to have a blind stab in the dark and say that you've got your 9 pin 3PDT wired sideways.

    PINS:
    - - -
    - - -
    - - -

    the switches throw from top to bottom not side to side. Use a multimeter on the diode setting to check.
     
  19. Sir Edward V

    Sir Edward V Not Actually Knighted... Yet!

    Dec 11, 2006
    Massachusetts
    ::sigh:: he took the switch out. and wired it up without the switch. it didn't work. its not the switch.

     
  20. sonicvi

    sonicvi

    Jun 10, 2005
    Houston, TX
    Those pictures quite frankly are useless. With wiring on perfboard that's that sloppy it could be just about anything. You need to trace back through your connections. I would clip those component leads too. And why you make everything spaced so far apart? You could make it probably 1/5 the size you have it now if you wanted.
     

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