Join Strat-Talk Today

Is this attentuator build simple and effective???

Discussion in 'Amp Input - Normal or Bright' started by bob_66, Jan 2, 2019.

  1. fezz parka

    fezz parka The Return of the Red Helmet Strat-Talk Supporter

    Age:
    60
    Messages:
    18,599
    Joined:
    Apr 21, 2011
    Location:
    Where the road and the sky collide.
    Black to ground. Red to a leg of the switch.
     
    Bodean likes this.
  2. bob_66

    bob_66 Strat-Talker

    Age:
    53
    Messages:
    117
    Joined:
    Sep 22, 2018
    Location:
    England
    doesnt seem to matter if i put the probe between the ground on the input jack and the switch or whatever i`m still getting this 00.4
     
  3. fezz parka

    fezz parka The Return of the Red Helmet Strat-Talk Supporter

    Age:
    60
    Messages:
    18,599
    Joined:
    Apr 21, 2011
    Location:
    Where the road and the sky collide.
    How is the meter set? You want it on the lowest ohms setting. In this case below it's 200 ohms.

    [​IMG]
     
  4. bob_66

    bob_66 Strat-Talker

    Age:
    53
    Messages:
    117
    Joined:
    Sep 22, 2018
    Location:
    England
    Like in the photos 3-4 posts back,200 ohms.
    I did make an error wiring the output jack initially when trying to fault find.Just had the two wires on the jack the wrong way around but it doesnt make any difference to the switch readings.
     
    Last edited: Jan 7, 2019
  5. bob_66

    bob_66 Strat-Talker

    Age:
    53
    Messages:
    117
    Joined:
    Sep 22, 2018
    Location:
    England
    So is no-one able to figure this out ?? This is supposed to be the complete circuit diagram.
     

    Attached Files:

  6. sadmoodyfrazier

    sadmoodyfrazier Strat-Talker

    Age:
    33
    Messages:
    470
    Joined:
    Sep 23, 2018
    Location:
    Italy
    I've made one and it was very disappointing. It was sucking a lot of tone.
     
  7. bob_66

    bob_66 Strat-Talker

    Age:
    53
    Messages:
    117
    Joined:
    Sep 22, 2018
    Location:
    England
    Thanks for your view on it, i only really need it to take the edge of the volume at home , amp isnt super loud to begin with .
     
  8. bob_66

    bob_66 Strat-Talker

    Age:
    53
    Messages:
    117
    Joined:
    Sep 22, 2018
    Location:
    England
    Ok try this drawn to exactly how ive wired it. Does it look right and if so how do i determine which way the impedance switch works???:)

    when i turn the l-pad knob right around one way i get 16 ohms between the right leg of the impedance switch and ground but only when the switch is to the left. When switch is to the right i get this 00.4. I dont know how to understand these readings?
     

    Attached Files:

    Last edited: Jan 8, 2019
  9. fezz parka

    fezz parka The Return of the Red Helmet Strat-Talk Supporter

    Age:
    60
    Messages:
    18,599
    Joined:
    Apr 21, 2011
    Location:
    Where the road and the sky collide.
    Set your meter for continuity. Place one lead on one of the center lugs, then the other on a corresponding (next to) on one of the outside lugs. Flip the switch. When you get continuity, that's the side that's connected.
     
  10. bob_66

    bob_66 Strat-Talker

    Age:
    53
    Messages:
    117
    Joined:
    Sep 22, 2018
    Location:
    England
    The impedance switch only has two lugs as in the drawing above post #28

    If i set it to continuity . For the two lug impedance switch ,with the one probe on each the lug and the switch to the left it beeps and reads 15 . With the switch to the right it beeps and reads 000?? What does that mean?
     
    Last edited: Jan 8, 2019
  11. fezz parka

    fezz parka The Return of the Red Helmet Strat-Talk Supporter

    Age:
    60
    Messages:
    18,599
    Joined:
    Apr 21, 2011
    Location:
    Where the road and the sky collide.
    Something is messed up. You should not get continuity in both positions.
     
  12. bob_66

    bob_66 Strat-Talker

    Age:
    53
    Messages:
    117
    Joined:
    Sep 22, 2018
    Location:
    England
    i cant figure what, i must have checked everything a dozen times
     
  13. Robins

    Robins Dr. von Loudster Strat-Talk Supporter

    Messages:
    11,710
    Joined:
    Dec 22, 2010
    Location:
    Germany
    @bob_66
    1. put in a fresh battery into your multimeter
    Use simple readings first. L-Pad fully cranked (full output and not dialed back like when attenuating the volume)
    2. Measure the input ohm readings on the input jack.
    3. Measure the output readings on the output jack.
    Switch the impedance switch and make measurings 2. and 3. again.
    Thanks in advance.

    All the best,
    Robin
     
    Tone Guru likes this.
  14. bob_66

    bob_66 Strat-Talker

    Age:
    53
    Messages:
    117
    Joined:
    Sep 22, 2018
    Location:
    England
    Robin, i will try again tomorrow morning if i understand what you`ve wrote that is , as this is the first time ive done any electronic build .
    Thanks
     
  15. johnnymg

    johnnymg Most Honored Senior Member Strat-Talk Supporter

    Messages:
    5,657
    Joined:
    Sep 5, 2015
    Location:
    Central Coast Cali.
    It's very difficult to trouble shoot this remotely.

    I would recommend going back to square one and just using the L-pad ONLY. That's all you need. All the other stuff in that box is just a confused mess.
     
  16. fezz parka

    fezz parka The Return of the Red Helmet Strat-Talk Supporter

    Age:
    60
    Messages:
    18,599
    Joined:
    Apr 21, 2011
    Location:
    Where the road and the sky collide.
    Which is why I posted the simple schematic. :D
     
  17. johnnymg

    johnnymg Most Honored Senior Member Strat-Talk Supporter

    Messages:
    5,657
    Joined:
    Sep 5, 2015
    Location:
    Central Coast Cali.
    YES, I apologize for not referencing your original post. :thumb:
     
    fezz parka likes this.
  18. fezz parka

    fezz parka The Return of the Red Helmet Strat-Talk Supporter

    Age:
    60
    Messages:
    18,599
    Joined:
    Apr 21, 2011
    Location:
    Where the road and the sky collide.
    I'm just glad to see someone else recognizing that other crap isn't needed. LOL
     
  19. Tone Guru

    Tone Guru Senior Stratmaster

    Messages:
    3,440
    Joined:
    Dec 13, 2011
    Location:
    Music City TN
    This is the most important function of the attenuator.
    It must consistently present the expected load to the amp at all settings.

    If the box doesn't present a reasonably correct load, nothing else really matters.
     
    Robins likes this.
  20. Tone Guru

    Tone Guru Senior Stratmaster

    Messages:
    3,440
    Joined:
    Dec 13, 2011
    Location:
    Music City TN
    I wouldn't worry about adding the fizz caps until the basic function was working.
     
    Last edited: Jan 8, 2019
    fezz parka likes this.
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.