Home Forums GuitarPCB Build Support Ancestral App and pots

This topic contains 11 replies, has 3 voices, and was last updated by  pgodfrin 4 weeks ago.

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  • #6657

    pgodfrin
    Participant

    Hiya folks,

    Successfully built an Ancenstral Apparition. The 125B is a little too small, so I ordered a larger enclosure. I am curious about the pots though – see if y’all can give me some advice.

    It seems the effect of the knobs is extreme – I can’t push them past a tiny amount from full counter clock wise. Is there a way to adjust the amount of “action” in the dial?

    pg

     

    #6658

    Barry
    Keymaster

    Especially if this observation is as extreme as you say you should consider it is quite possible there could be a build issue. Visually recheck and verify all values by color band and part number. For example R11 is 470 ohm sometimes mistaken for 470k ohm. Since I have not previously heard anyone suggest an issue like this and it was not my experience this makes it worth a serious re-check.

    If we have pictures we can take a look as well.

    #6665

    pgodfrin
    Participant

    Great thanks I will. Besides confusing 470R and 470k, what should I be on the lookout for?

    One things I goofed up is I used a 1/2 W resistor in one case – would that matter?

    I’ll work on getting a photo

    #6668

    Barry
    Keymaster

    1/2 watt is fine other than fit. With that in mind besure to re-flow any suspect solder joints. Especially dull grey instead of shiny. Check that every capacitor matches the BOM and that they match the exact location on the board.

    Finally visually inspect and verify every resistor with an online calculator.

    #6669

    pgodfrin
    Participant

    roger that, thanks Barry!

    #6673

    pgodfrin
    Participant

    My, my. Didn’t even bother checking components, saw these two macked up solder points on the pots. Oddly enough the (top) one has continuity to ground. Checked the bottom one and the resistance sweeps across the pot. However, the last photo shows the ground solder point has NO continuity to ground…

    ugh.

    #6683

    pgodfrin
    Participant

    Ya think this PCB is gorked?

    #6691

    Billy
    Moderator

    The decay pot lug 1 does connect directly to ground

    The depth and attack pots don’t, attack is connected to ground via R19 If you look at the schematic you’ll see how they’re wired and where you should expect continuity

    If I understand correctly you are saying that all pots don’t have much range across thier rotation and they go from min to max very quickly?

    Double check you have the correct value pots in the correct positions there’s not a huge difference in pot values but if you put a B2K were a B10K should go then the range would be affected

    As Barry says check all component values and orientation it’s very easy to use an incorrect value in a fairly high parts count build

    This is what I use to check resistor values

    https://samstechlib.com/610938/en/read/Sam_s_Tech_Library

    #6700

    pgodfrin
    Participant

    OK, cool. I will. Thanks!

    #6721

    pgodfrin
    Participant

    pots look good.

    #6727

    pgodfrin
    Participant

    Hiya Folks,

    Well, the components seem to check out. I’ll put it all back together and test it. Outside of the enclosure, it seemed to work fine, although a tad bit of a lower signal. I think the build is prolly ok, I wonder if I had shorted out or compromised something when I had it jammed in the smaller enclosure…

    #6729

    pgodfrin
    Participant

    Well folks, Good news. I checked out all the components, did a re-flow on the pots a couple of joints, and plopped it into a larger enclosure, and it works much better. Erm, the wires are a bit long on the pots, oh well…

    Prolly dinged something jamming it in the smaller box, or the re-flows improved something or other.

    Anyway, thanks!! On to the next project!

    pg

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