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    DuoPhase build troubles: squealing, high end roll off, signal degradation, unwanted parallel audio and LFO

    Here’s some pics of my crude decoration. I will eventually drill some spots where I want my LEDS to go but i haven’t decided what color yet. I have a good selection of colors so I’ll have my pick
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    DuoPhase build troubles: squealing, high end roll off, signal degradation, unwanted parallel audio and LFO

    Finally got it finished! It seems all roads lead to grounding issues when it comes to troubleshooting a build. I was so intent on trying to find the mistake in the PCB I dismissed how much a cold solder could fuck up the circuit in the jacks or switches. I reflowed everything making sure my iron...
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    DuoPhase build troubles: squealing, high end roll off, signal degradation, unwanted parallel audio and LFO

    Interesting read, that’s good to know because I am still very rusty as far as reading wiring diagrams goes.
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    DuoPhase build troubles: squealing, high end roll off, signal degradation, unwanted parallel audio and LFO

    Yup that’s definitely a cat hair, it gets everywhere lol. But yeah good shout I think my worst solders are on the switch and jack port so that’s likely the cause of my signal loss. Will re do and report back regarding that issue
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    DuoPhase build troubles: squealing, high end roll off, signal degradation, unwanted parallel audio and LFO

    Eureka! I added a wire from one of my jacks to the enclosure via copper tape. The signal loss is still present and one side is still overwhelmingly LFO dominated. But the other side is giving me some whooshes so progress! I’m going to double check my grounds for the fourth time (argh) and see...
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    DuoPhase build troubles: squealing, high end roll off, signal degradation, unwanted parallel audio and LFO

    yeah I’ve done some reading and people basically just say moving the cables away. I’ve tried some combinations but I’ll try a few more. And I never thought about the jack connection being a point of contact with enclosure but that’s a good point. I’ll maybe hardwire something to the enclosure...
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    DuoPhase build troubles: squealing, high end roll off, signal degradation, unwanted parallel audio and LFO

    I tried moving the cables in between the PCB and the enclosure on the pot side, but no difference as far as I can tell as when the cables were behind on the component side
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    DuoPhase build troubles: squealing, high end roll off, signal degradation, unwanted parallel audio and LFO

    Hm, don’t have any on hand unfortunately. Just checked the IC’s and still getting weird values on them. Pin 4 is -8.1V and pin 8 is full 8.7V. Any chance you have an idea of what values I should be expecting? 4.5V is my understanding?
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    DuoPhase build troubles: squealing, high end roll off, signal degradation, unwanted parallel audio and LFO

    Ah fook, yeah I’m using TL072 per the spec sheet. I saw on the reviews of the PCB that the bias control can get the ticking to go away though. But im guessing the LFO leaking into the audio signal isn’t from that either
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    DuoPhase build troubles: squealing, high end roll off, signal degradation, unwanted parallel audio and LFO

    Ok! So the tits were probably shorting. I added some thick paper between the pots and the PCB and now the LFO is not high pitched/squealing anymore. Unfortunately though the LFO phase clock sound is still dominating. Doing some more debugging to see if any of the IC voltages changed or if I can...
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    DuoPhase build troubles: squealing, high end roll off, signal degradation, unwanted parallel audio and LFO

    hm that’s a good point, will bend the pots out of the way and see if that changes anything. Also yeah totally agree on GPT, I’ve had mixed results on troubleshooting with it. On the quaverato I built it actually pinpointed the problem pretty quickly though, despite the manufacturer insisting it...
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    DuoPhase build troubles: squealing, high end roll off, signal degradation, unwanted parallel audio and LFO

    Hello, This is my first time making a post but I’ve been perusing for a few weeks so hello all. This is my first pedalPCB build but I’ve done a zepellin labs quaverato before and also I solder all my patch cables so I feel comfortable with an iron (although I did have trouble with the jacks...
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