Monday, 28 April 2014

Bearfoot Emerald Green Distortion Machine

Today is Bearfoot day.  Info about the original

For the Vox lover in all of us, Bearfoot FX has created the Emerald Green Distortion Machine- a pedal which captures the chimey, crunchy essence of the AC series amps and provides a faithful simulation of the Vox tone through a variety of amps. Used through a Vox, this pedal acts as a booster driver to really push your amp into sonic heaven.  The EGDM Distortion and Voice controls are interactive and used together will take you from the low, clean tones of an AC all the way up to the screaming tone of a cranked Vox. The EGDM is extremely responsive to picking dynamics and your guitar’s volume knob.  

Bearfoot FX is the brainchild of Bjorn Juhl of BJF Design and Donner Rusk of Donnerbox. Every pedal is handpainted and no two are exactly alike. The pedals now ship with a plain, unpainted bottom plate to help ensure the most secure contact with adhesive Velcro for use on pedalboards. Bearfoot FX pedals are handmade in St. Louis, Missouri, USA. 









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46 comments:

  1. Cancel my plans... clear my calendar. Shit just got real.

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  2. I love that Petty demo! Perfect.

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  3. IvIark rules !! Thanks so much for the great stuff you do -

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  4. I'm assuming I could substitute another NPN germanium transistor with hfe > 80 for the 2n1308. Or is there something magical about the 2n1308, other than being what Bjorn used?

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  5. Hey, IvIark, there seems to be a disagreement between the two board views as to the cut placements.

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    1. I thought I'd re-copied over my last version, now done. It would have still worked though, I just repositioned some of the cuts

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    2. One thing about this, socket the 22uF at the germ source. That value isn't positive and has been inferred from something similar. But may need tweaking.

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  6. Hi Mark, Could you please specify which one of the elco's is the one that I should socket. I cannot locate the 'germ source'.?

    I have ordered the parts and seperately ordered the 2n1308 from the UK. I hope it'll be in the Netherlands soon so I can start building!

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    1. It's the 22u attached to the emitter of Q2, but having checked a gut shot I'm fairly confident that 22u is correct

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  7. Thanks. Really appreciate that you help everyone here and I'm enjoying your designs almost every time I'm playing!

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  8. My board is ready except for the 2n1308 that I have to wait for to arrive. Is it correct that treble pot lug 3 is not used?

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    1. Thank! Waiting sucks!

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    2. My 2n1308(and a spare) has arrived. Unfortunately I am not getting any working effect signal. I have checked all my cuts, wiring and knifed between my copper tracks and double checked my component placement. A also tried the spare 2n1308.

      When I put in the 2n1308 in a certain way when I turn on the effect there is a good guitar sound but it is the same as the true bypass signal. When I put it in in another way I am getting a loud hum and storm like sounds and a very weak CLEAN guitar sound in the background.

      Unfortunately I don't know what the exact pinout of my 2n1308 is so I just tried different ways of putting it in the socket.





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    3. I did notice that the middle pin of the 2n1308 appears to be directly connected to the metal can of the transistor while the two outer pins appear to be isolated from the metal can by some black substance. Maybe this helps determining the pinout? When I try the pin-out of the link below the above mentioned problem is not solved.

      http://ibm-1401.info/2N1308-.jpg

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    4. Not sure which make you have, but assuming the pin out is similar to the Texas Instruments 2N1304 I have (NPN), if you are looking at the underside of the transistor (i.e. with the pins upwards) there is a little tab to the bottom left, the pins form a triangle with the point at the top. The pins are (from the left) E B C with B being at the top of the triangle.

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  9. Thanks dbat69. That would be the same pin-out as in the picture I linked in my previous post. That one doesn't work for me and when I turn the transistor 80 degrees that also does not work.

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  10. I meant 180 degrees, sorry.

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  11. My 2n1308 are these:

    http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=160930847192&ssPageName=ADME:X:AAQ:GB:1123

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  12. I made a mistake after all. Checked again and 2 rows where mistakenly connected by excess solder that I somehow missed during knifing.

    It works fine now! To me it only sounds like a Vox with guitar volume rolled back, drive pot in the lower range and the volume on the effect turned up. But while not sounding like a Vox in other settings, it does sound good in those also.

    The Voice function is very subtle by the way.

    Guess this can be verified. Thanks!

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  13. A collection of my builds that I would like to share. Down on the upper right is the Emerald Green Distortion Machine:

    http://i61.tinypic.com/ncxdac.jpg

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  14. I meant 'down on the far right'..

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    1. What an awesome collection, thanks for sharing the pic. Don't Hammond sell their products in Holland? :o)

      And I didn't notice your verification, that's excellent. Top job buddy!

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  15. Thanks mate! I also use Hammonds haha. But I like to keep 'em cheap and I got most of the housings in the picture for under 3 Euro in second hand shops. Some are more but I got those to have something different.

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  16. I built this one today and it sounds great. the only error is that lug 1 & 3 on the voice control should be swapped, since it should have more low end when rolled CCW, plus the taper is much more even that way.

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  17. Great pedal! I popped in an AC127 and it sounds awesome :)!

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  18. I love this one, and it sounds great with a bass too (and with no mods!).
    i'm using the specified 2N1308 (NOS TI with gold leads) and I couldn't be happier with it.
    pics below:

    http://johnkvintageguitars.homestead.com/Effects/Fuzz-ODs/BJFE/EGDM-01.jpg

    http://johnkvintageguitars.homestead.com/Effects/Fuzz-ODs/BJFE/EGDM-02.jpg

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  19. Some 2N1308 are on their way, so i´ll give them a shot. I really like the BJF/MP stuff, and i built almost all of them..... :)

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  20. I built this pedal to the original specs and LOVE IT!! It is a pretty straight forward build and It sounds great.

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  21. I have a question, the original Emerald Green can take 9v to 18v. Can I plug a 18v into it without frying it? Is it buit on the exact same schematics?

    Thanks

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    1. No problem there. Please report back about the sound at 18V... :)

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  22. Just thought I'd add that yes it's no problem but only if your caps are all rated above 18v

    If you used 16v or lower caps then they will probably burn up

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    1. To be totally right, the only cap that shoulb be 25v rated is the 100uf one, all the rest can be 16 or even 10v with no problem.

      The 100uf cap is the only one that wilh have to manage 18volts, the other ones will deal with a way lower voltage.

      J.

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  23. I own both the BJFe and BearFoot versions of the EGDM. There's a marked difference between them. Donner told me the BF uses a quieter germ tranny. There may be other differences, but I wouldn't know. Anyway, the BF version is indeed quieter. Both produce a high pitch hiss, but the BJFe also produces a considerable "rushing" noise in the mids that's not there in the BF. Also, the Voice control is much more effective on the BJFe. The BJFe sounds a bit more scooped in the mids with a bit more low end, while the BF is peakier in the mids. Through my AC15HW1X, and highly prefer the BJFe. It's my main dirt. NOTHING sounds like it, not even the BearFoot version.

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  24. I just finished this build and it is incredible! There isn't a bad setting on it and it just sounds great.

    JFETs + germanium transistor + BJFE = greatness

    http://i825.photobucket.com/albums/zz176/Dub-T-123/58DC3C33-74A2-4C6F-9491-2741F0ACE400_zpsft9m87hn.jpg
    http://i825.photobucket.com/albums/zz176/Dub-T-123/89C5A16B-1E59-455F-B01C-2F277086EAB8_zpsuvf6fpop.jpg

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    1. Great looking build Mr T, thanks for the pics

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  25. Thanks for the layout Mark. With only one link this is a joy to build

    I've come to the same conclusion as Zick. With my guitar's volume rolled back a bit, the sound is pretty spot on to my ac30. Otherwise it sounds like a distortion pedal, but a really really fun distortion pedal!

    Overall it's a super fantastic build. Highly recommended

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  26. And here's a little clip I recorded of this pedal

    http://youtu.be/m2dJG7ZDARY

    I had it turned up all the way so it's kindof making my iPhone mic go all squishy, but hey I just wanted to show you guys that it works :P Maybe I can trade this pedal in for some guitar lessons :0

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  27. Can anyone link me to a schematic? (thought i'd asked before but I can't find my comment...)

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    1. I've been searching, but my google-fu must be weak

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  28. I have used one 2N2222A because I could not have thought 2N1308 and all the rest that I have tried had profit too much small, not if it sounds just as the original one but I like and sound very well, thank you lvlark!!

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  29. Hi there,
    Can someone post his voltages together with the transistors used?
    Thanks in advance.

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