Home › Forums › Vintage EHX › Wiring vintage Small Stone for True Bypass

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  • March 15, 2018 at 12:11 am #85250
    sgtbaker
    Member

    I’m brand new here, so I hope I’m in the right place!
    I’m trying to resurrect a 75/76 small stone. The enclosure suggests it’s a v2, but the board looks like a v1? I believe my parents were the original owners of it, and I “borrowed” it from them years ago, so I don’t think it’s been modded in any way. Anyway, this will be my first foray into pedal repair/mod, and im having a hard time figuring out which wires are which, specifically: effect input, effect output, PCB ground, and PCB power. I want to wire it for true bypass with an LED, but what I see on my pedal isn’t matching up with images and diagrams I’ve seen, and I’m just learning how to read schematics. Would anyone here know how I would identify the wires and input points on the PCB for this version?
    Any help would be so greatly appreciated!

    March 16, 2018 at 11:38 pm #123717
    sgtbaker
    Member

    Update, I was able to wire it up for true bypass last night and it works great. (Bonus: The volume drop doesn’t seem any more pronounced then it was before.) What had been throwing me off, and what I finally realized, is that the “effect input” wire that I needed to connect to is not coming from the board, but from the “color” switch. Once I figured that out, I was able to get it wired correctly on the first attempt.

    — BTW, I’m working from madbeanwiring’s “input grounded” true bypass tutorial (http://www.madbeanpedals.com/tutorials/downloads/MBP_FootswitchWiring.pdf)
    with the help of this picture (https://www.ehx.com/?ACT=25&fid=5&aid=331_gBOwbhcqUjMlM0S8Cezr&board_id=1),
    which I had to translate to a 3PDT switch and to madbean’s “input grounded” diagram. I can give details if anyone’s interested. —

    So I’ve got the bypass part done, but I still don’t know where “ground” is on the board, and I’m going to need that when I attach the LED and ground everything. Can anyone enlighten me as to where the “ground” is on the board?

    (I realize this is a ridiculously rookie question, but like I said, I’m brand new to all of this, and I’m learning as I go.)

    Thanks again!

    April 1, 2018 at 4:36 am #123764
    sgtbaker
    Member

    Update: Well i was able to wire in the LED and ground it (i think!). The LED works as it should, and I’m not getting any hum or noise.
    But as I mentioned before, the volume drop isn’t more noticeable than it was before, but it’s starting to bug me anyways. So I tried to replace a resistor as suggested by this guy
    (https://crawlsbackward.blogspot.com/search/label/Effects Pedals DIY?updated-max=2011-04-03T15:23:00-04:00&max-results=20&start=32&by-date=false&m=0)
    ( I believe it’s the fourth article on that page)
    but it didn’t seem to make any difference. I’m going to try again soon with fresh ears, because I have to open it up again anyway to reattach the 9v battery clip.

    Does anyone know of a fix for the volume drop on this particular PCB?

    BTW, if anyone needs or wants pictures of what I did to my pedal, just let me know.

    July 24, 2018 at 1:22 am #124130
    ddavis20341
    Participant

    I’m having a problem with a “pop” when I kick the pedal on or off which I assume is related to the grounding as well. Anyone had any luck with figuring that out? I also have a small pop when I take the power in and out, so I assume it’s related to the ground/power of the pedal.

    August 21, 2018 at 5:52 am #124214
    sgtbaker
    Member

    I noticed the pop a lot more before I converted mine to true bypass. It’s still there, but not as loud. The only workaround I employ is to switch the pedal on and off several times. The pop gradually diminishes until it’s not audible anymore. I’ve read that you can add a pull-down resistor to eliminate it, but I haven’t tried that.

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