Home Forums GuitarPCB Build Support Emexar 250 Build (solved)

This topic contains 11 replies, has 4 voices, and was last updated by  Clintird13 5 days, 21 hours ago.

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  • #5221

    Clintird13
    Participant

    Lights are on but nobody is home. Clean guitar tone when pedal is in bypass, but no audio when the effect is engaged. D3 has a jumper in it.

    Do I have the pots mounted wrong? Not sure how else I’d fit surface mount pots inside this enclosure. I appreciate the help. Cheers!!!

    #5223

    wilkie1
    Moderator

    Double check your wiring as shown in the guide here:

    https://guitarpcb.com/forums/topic/wiring-examples-standard-series-combo-buff-n-blend-easy-order-tone-tweq/

    I can’t see if you have the IN jack connected to the 3PDT board.

    #5224

    Clintird13
    Participant

    Switch in & out

    Board in & out

     

    #5225

    Clintird13
    Participant

    Just did a continuity test with my multimeter and when the effect is on both output leads (ring&tip) are grounded. That’s at the output jack, at the circuit board and at the switch circuit board.

    When in bypass mode the ring is grounded and the tip is not.

    Bad switch or switch PCB? Thoughts?

    #5227

    Cybercow
    Moderator

    From what I can see in the photos, it appears that the output wire is connected to ground of the 1/4″ jack. Look closely and with intent at the silk-screen on top of the PCB and notice the little “T” next to the input and output pads. The “T” indicates “TIP”. The “T” connection points are what need to go to the “BI” and “BO” connection pads on the stompswitch daughterboard. Able-check that and let us know please.

    #5229

    Clintird13
    Participant

    That was it!!! I had never noticed the little T before. Even went back and looked at previous builds with which I had gotten lucky to have the wires on the proper terminals. Thanks to you both for the guidance. Cheers!!!

    #5230

    Cybercow
    Moderator

    Clintird – Happy to help. It’s usually the little things that trip us up.

    #5231

    Barry
    Keymaster

    Here is an image taken from the Guides Page to print out.

    This will be a reminder since all builds work the same.

    #5232

    Clintird13
    Participant

    Barry…that’s the doc I followed…put the wires in the same order as that picture. Did not pick up on the “T” printed on the PCB. Never noticed them until last night and I use a magnifying glass helping hands to assist my tired eyes. Full on rookie mistake. Thanks for the guidance.

    #5237

    Barry
    Keymaster

    So the T Pad In/OUT graphics with Red arrows pointing to the T Pad in the Silkscreen does not grab enough attention? I know it is noticeable now after the fact but the point is to make it clear before there is a mistake.

    It is not always convenient to put the Pads in the exact same orientation (hence the Pads marked T) depending on the Layout so I was really hoping this would be more intuitive. Alternately I do not want a sheet too cluttered up likely having the opposite effect of what I am going for.

     

    If there is a better idea I am all ears but it must be a one design fits all diagram since the Emexar and other Build Documents already have the correct wiring by orientation for each specific build.

    The point is I was hoping to have an intuitive One Size Fits All Diagram for people to refer to without always having to printout the entire build document.

    #5238

    Barry
    Keymaster

    Here is an attempt at a new diagram:

    Does anyone think this new diagram will prevent T Pad mistakes?

    #5239

    Clintird13
    Participant

    I totally missed it, but I am a special kind of dumb. However, in my opinion the new layout clarifies and doesn’t add too much clutter. Know this though…I’ll never miss another printed “T” on a PCB. 🙂

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