Friday, 5 October 2012

ZVex Woolly Mammoth - Cut Down Version

Vince on here asked me if I could adapt my layout to make a 2 Knob Woolly Mammoth with just Pinch and Volume controls.  He wanted me to remove the Wool pot simulating it being set fully clockwise, and  remove the the EQ pot and simulate it being set dead centre.

The Wool pot was easy enough, it just takes the 100u cap from the emitter of Q3 to ground in the clockwise position, so I could connect that directly to ground.  The EQ pot was 10K and so I used two 4K99 resistors from where lugs 1 and 3 of the EQ pot would have connected, and taking the other side of both resistors to the same row simulated the centre setting.  If you want to alter this slightly just socket them and change the ratio between the two resistors, maybe try a 6K8 and 3K3 for instance if you want slightly more treble or swapped round for more bass.

I think it sounds great so I had to post it here just in case anyone else fancies making one too.  Vince's excellent demo:






Posted by at 17:47
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41 comments:

  1. Anonymous5 October 2012 at 18:20

    Cool ;o)...I also found that completely omitting the 220n on board gave a huge treble/fizz increase ... not bad, but not to my liking... something else to play with for someone maybe.

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  2. Anonymous6 October 2012 at 18:23

    just tried this out...there are only 14 columns, so I have an extra in the middle :) not something I will prob ever use, but it works :)

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    Replies
    1. IvIark6 October 2012 at 19:02

      Ha ha, I removed a column when I put the cap on the switch and forgot to change it! :o)

      Delete
  3. Nelson Oliveira9 October 2012 at 06:52

    Man...i tried the 4 pots version, two times...now this one. just cant make it work. im using stripboards, can it be the problem? i test the circuit with just the pots, jacks and battery, without the pots...nothing happens. what i get at best was just the clean guitar sound. any tips?

    thanks in advance!

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    Replies
    1. Nelson Oliveira9 October 2012 at 07:01

      The ground on board circuit goes to the sleeve on the output jack, right? output on board goes to the tip in the output jack, input goes to the tip in the input jack, and sleeves from both jacks are conected for grounding. is this correct?

      can i send you some pics of my circuit?

      Delete
    2. Nicholas9 October 2012 at 18:55

      you can't test the circuit without the pots. for all intents and purposes, because of the pots, the strips that have a pot lead coming from them are connected BECAUSE of the pot. it's probably why you're getting nothing.

      Delete
    3. Nicholas9 October 2012 at 18:56

      well, at least for the pinch knob anyway

      Delete
    4. IvIark9 October 2012 at 19:06

      Yes Nicholas is right. Without the Pinch pot the Q1 emitter is out of circuit so it won't work

      Delete
    5. Nelson Oliveira9 October 2012 at 19:49

      i already tried with the pots before. think its a really nice and easy project to begin with, right? damn.

      Some images could help?

      [IMG]http://i83.photobucket.com/albums/j294/ibreath/Board04.jpg[/IMG]
      [IMG]http://i83.photobucket.com/albums/j294/ibreath/Board03.jpg[/IMG]
      [IMG]http://i83.photobucket.com/albums/j294/ibreath/Board02.jpg[/IMG]
      [IMG]http://i83.photobucket.com/albums/j294/ibreath/Board01.jpg[/IMG]

      Thank you, mates.

      Delete
    6. IvIark9 October 2012 at 20:23

      Are you sure there are no bridges with that soldering? There are a few spots where the solder is certainly hanging over the next row and looks like it may be touching. That may want checking for unwanted continuity between tracks with a multimeter. Also some of the values look like they maybe wrong. The top right hand most resistor is supposed to be 10K, but on your board I see those colours as red-green-orange-gold which would be 25K?

      Delete
    7. Anonymous9 October 2012 at 20:32

      To be honest, It looks to me like you probably have quite a few bridges.. if you have a small hacksaw or similar to seperate the tracks and there looks like a break in the track to the far right..

      http://oi47.tinypic.com/w1fz0m.jpg

      Delete
    8. Nelson Oliveira9 October 2012 at 20:49

      shame on me. i switch the 20k and 10k resistors. sorry, yeah, i'll try again today and i post the results here. the begining is that hard i think. really really thanks for your kind attention.

      Delete
  4. Mark A. L.10 October 2012 at 17:26

    Hi, Guys, does the ground from the 10K pot go to sleeve of output, please?

    Mark.

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  5. Travis10 October 2012 at 18:39

    It goes to anything that's grounded. Whatever is neat/convenient for you. I usually just make sure my enclosure is grounded and solder the lug to the back of the pot.

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  6. Unknown11 October 2012 at 16:03

    what sort of switch?

    ReplyDelete
  7. Mark Tuazon19 October 2012 at 14:41

    Let's say this is the first pedal I'm going to take a stab at. My question is how is the stomp switch set up? if you could just tell me which legs go where, it'd be greatly appreciated

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    Replies
    1. IvIark19 October 2012 at 15:00

      http://tagboardeffects.blogspot.com/2012/02/offboard-wiring.html

      Delete
    2. Mark Tuazon19 October 2012 at 15:08

      Thanks a lot!

      Delete
  8. Anonymous22 October 2012 at 15:50

    BC108's sound killer in this...

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  9. Unknown2 November 2012 at 15:39

    I really cannot make this work, i've built it twice and no fuzzy mammoths for me. Only sounds like the input signal passing straight to the volume pot and then out. The strangest thing is that whenever i connect in/out sleeves to battery ground, no signal will pass through the unit. Also then no controls are working. I want this to work so badly :(

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    Replies
    1. Unknown10 November 2012 at 09:10

      Got it working after a fair bit of debugging, really smooth and loud!

      Delete
    2. sapedals15 February 2018 at 01:57

      Hey what was the fault?I have the same problem!

      Delete
  10. Thom__stone19 November 2012 at 11:24

    stupid question considering the name of the pedal, but anyway to easily achieve a little less wool?

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  11. Unknown12 December 2012 at 20:16

    What switch should be used for this project?

    Anyone have any pictures of this thing wired to the stomp switch and toggle for a visual aid when building?

    Thanks!

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    Replies
    1. mirosol12 December 2012 at 20:59

      Two pole two position On-On. Like this one here:
      http://www.musikding.de/Switches/Toggle-Switches/Toggleswitch-DPDT::163.html

      This guide should help you a bit:
      http://tagboardeffects.blogspot.fi/2012/02/offboard-wiring.html
      Just pretend that the input of that pseudo-board in the guide is the lug 2 of the switch and output is the lug 2 of the output pot.

      +m

      Delete
    2. Unknown13 December 2012 at 15:01

      Thanks for the reply! Found this offboard wiring too from the forums...
      http://gaussmarkov.net/wordpress/thoughts/wiring-up-a-1590b/

      Delete
  12. Unknown3 June 2013 at 16:57

    Ok guys, I need a little help. I don't have any 220nf caps, I do have 100nf caps.
    Di I put these in parallel? When I look this up online it says caps in parallel add rather than divide like resistors. Is this correct?

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    Replies
    1. Lee16 June 2013 at 04:07

      Yes I think you are right. Putting caps in parallel will add while in series divide.

      Delete
  13. Unknown24 July 2013 at 01:41

    If I only want the less bassy input capacitor, should I go with the 220n or 22n one? Thanks.

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    Replies
    1. Dave24 July 2013 at 09:10

      Go with 22n, smaller caps filter out low frequencies, bigger ones let them through. It's always a good idea to socket input and output caps so you can experiment easily.
      Thanks
      Dave

      Delete
  14. Chimbolo891 September 2013 at 07:40

    Just want to say thank you.
    THis was the frist pedal I have put together and it sounds great!

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    Replies
    1. Chimbolo892 September 2013 at 00:32

      http://i.imgur.com/KhED2QS.jpg
      All I had for an enclosure was an ipod case looks kind of cool.

      Delete
  15. msj2726 February 2014 at 17:16

    Thank you so much for this site. I have assembled many pedal kits, but this is my first foray into stripboard. I built two- one for me and one for a bandmate. Both builds took a bit of troubleshooting, but with the clear instructions and detailed comments I was able to de-bug them myself. Thanks again- time to try some more!

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  16. Unknown26 July 2014 at 07:49

    Is this essentially the Fuzzolo? It has only volume and pulse width.

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  17. Anonymous7 September 2014 at 22:28

    I'm confused about the top right corner of the diagram… Is that a little daughter board of some kind or a dpdt switch (or neither)? I've got the board all ready to go but I'm stuck on that. This is only my 2nd vero build, so please excuse my newbie question. Any help is greatly appreciated, thanks!

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  18. Wjr78127 July 2016 at 11:47

    ok ive been trying to figure this out for a while, and i know it depends on the cirguit, but in this situation how would i modify it so that i could use a 50k linear pot instead of a 10k? I have a radioshack 10k linear pot but its so huge it wont fit in enclosure , i have already drilled it a while back for a different circuit, but luckly its 2 pots and a switch, any replies would be a huge help, I have a bunch of pots but it seems like the circuit i wanna build im always missing something.

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  19. Wjr78127 July 2016 at 21:36

    ok ive been trying to figure this out for a while, and i know it depends on the cirguit, but in this situation how would i modify it so that i could use a 50k linear pot instead of a 10k? I have a radioshack 10k linear pot but its so huge it wont fit in enclosure , i have already drilled it a while back for a different circuit, but luckly its 2 pots and a switch, any replies would be a huge help, I have a bunch of pots but it seems like the circuit i wanna build im always missing something.

    ReplyDelete
  20. Andy MM12 January 2017 at 07:14

    What is the 4k99 resistor about? Do I use a 5K resistor thats not quite 5k?? I've built a ton of pedals over the years, don't quite understand what thats about.

    ReplyDelete
  21. Sandra Shaw23 April 2017 at 12:37

    Yes, it is only an approximation so 5kish. As to the posts about the DPDT depicted in the top right, I will just extend the board by one column and put the 220n in as per the full size version. If you can't get it going, I encourage you to build a test box which has the stomp switch input/output jacks and DC in incorporated, with 4 alligator-clipped-leads (9V, gnd, input, output)attached to test it before you put it in an enclosure. I had never had any success with pedal building until I built such a box this weekend and hooked up a vero circuit I built a couple of years ago. Success! Then I had to work out what it was. Turns out it was a clone of a Colorsound Tonebender Jumbo

    ReplyDelete
  22. jon q16 October 2019 at 18:59

    Sup' ya'll. I made one of these, it sounds fantastic in my bedroom but I find that I absolutely vanish if I play it at band practice... is there a way to mod it to boost the mids?

    ReplyDelete

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