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Hello. I hope you can help me debugg my build. The tremolo works ok but there is a strange noice following the LFO as soon as I turn it on. If I use the killswitch the noice is still there. I did reflow the PCB, same result. Any ideas whats wrong? Short somewhere, bad component? The only thing I’m not sure about in the building documents is the speedpot, The layout of the Green PCB I’m using differs from the red in the wireing instructions, 1 is on the other side of the speedpot connections and the wires are crossed. Is it supposed to be wired “backwards”?Hope for some ideas. B
What kind of noise is it
With you turning the LFO off via the killswitch that may indicate it’s not the LFO causing the noise
I would try to separate your power and audio wires If they have to cross over each other make sure they cross like this + and don’t run in parallel like this =
Hello Billy. It’s like a distant siren following the speed of the LFO when I change the speed. At the moment the powercords don’t kross any other cords because everything is “outside the box”. C5?
He is referring to the power wiring running in parallel with the audio wiring which I can see in the picture above.
Yes I mean your circuit power and ground wires and audio carrying wires at the bottom right of the pcb you have your blue out tip wire and 9v and ground wires twisted
It can lead to parasitic oscillation so ideally you want your wires as short as possible and audio and power wires as far away from each other as possible
You could try wiggling the wires with something non conductive like a pencil to see if it affects the noise and helps you identify the cause
<p style=”text-align: left;”>Sorry, the wiring is just that way to get a clear photo of the pcb. When I test it all cabels are stretch out away from each other.</p>
Hello. Is there any possibility to send a 43 sec video of the problem? Can’t load it here so…..
Best wishes, Bosse
https://drive.google.com/file/d/1Pv7bB80YQeLl0ecpqYOo4YsYlkw4eGo7/view?usp=drivesdk (hope this works, never tried it before). I reflow the soldering of switches and wires, cut many of them shorter, and it got worse?. Even the voltages readings got worse (just Q3) .
Q1 g 4,33 s 4,58 d 9,09
Q2 e 1,05 b 1,66 c 5,5
Q3 g (-1) – 1 s 0 d 0
Q4 e 0 b 0,61 c 2,2 – 5,2
<p style=”text-align: left;”>I’m a “newbi” so I’m not sure what the yellow an Green dots on the red pcb means, what to check for. The blue lines I checked for continuity and they are ok. I Will try to build a audio probe but that may take a while. I live in the mountains on the Greek Island of Crete and buying components takes at least two weeks. ?</p>
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