Trace wire patch points for vr3

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gujo
 
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Joined: Sun Dec 11, 2022 4:45 pm

Trace wire patch points for vr3

Post by gujo »

While playing around with different values on q8, q9 and q10 I also replaced vr3. This has been replaced many times over the years on my old beaten x0x and I believe that this time the soldering points at the pcb was damaged.
I managed to find a patch point for the right pin on vr3 but turning the knob does not affect cutoff freq at all, could anyone recommend patch points for the 2 other pins?
IMG_3272 Large.jpeg

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gujo
 
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Re: Trace wire patch points for vr3

Post by gujo »

I managed to solve this with a multimeter and some help from looking at pictures of unfinished x0x pcb:s.

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oer23
 
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Re: Trace wire patch points for vr3

Post by oer23 »

If you look the schematic you can see that VR3 pin1 is connected to +12V (emitter pin of Q27), VR3 center pin to pin3 of TM3 and VR3 pin 3 to R47.
Cheers.

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