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Cheers @comeradehoser I hadn't thought to remove the washer and try the other positions I'm getting no filter sweeps in any position on the rotary One thing I noticed is there is a popping sound when the rotary goes between positions 5 and 6, so something is connected somewhere

Proper IC arrived @Cybercow and that's fixed it :) Got a silly decal designed, will post a picture when I'm done

I was careful with those dual gangs but yeah definitely worth looking at. No change unfortunately. And I've lost my appetite I measured these ones, they're okay. You can get them in different tolerances

For 250pF I soldered 220pF on the front and 30pF on the back

My ICs

Wonder if anyone can help My Acrobat is passing signal and the distortion works, but I have no action on the filter section Turning the 'height' control to the right attenuates the output The 'bandwidth' control is seemingly inactive The 'freq' control might be doing a little something but...

Looks like I've got a CD40174BE instead of a CD4017BE. That would explain it. My eyes go squiffy at times with these part numbers I've ordered a 4017 from a UK supplier and will report back My ICs are from Mouser so they should be good Cheers

Thanks for the schematic @Sturgad that's really helpful. Just tracing it through I'm getting signal from TL072 to pin 14 (SIGIN) of CD4046BE, but VCOOUT on pin 4 is that constant squeal sound I removed the CD4017BE and CD4024BE from the sockets and listened again, the same squeal is present on...

Either of you guys get it sorted? I have the same exact issue

@finebyfine @szukalski thanks both, much appreciated. I've jigged it around and applied your suggestions. I haven't done much over on the left hand side so I might give that another pass tomorrow It needs straightening up now, and I can probably tuck it in to reduce the overall dimensions

I've learnt that by unpouring the ground plane I can see both layers at once so I've rejigged some of the traces to keep them apart Fully aware that I may be rearranging the deck chairs on the Titanic at this point

Hello forum, this is my first go at Diptrace/PCB design. I'd appreciate a sanity check My objective is to use a pile of low gain (30-50 hfe) Russian PNP germanium transistors I picked up The EQD Dream Crusher circuit is designed around low gain NPNs, so I started there and added a voltage...

@SYLV9ST9R okay thanks, sounds simple when you put it like that :)

That's really cool @SYLV9ST9R I think I'm gonna order this PCB How did you get the frequency notches lined up on the labelling? It looks very neat

Last question, if I feed this 12v to get -12v will the IC explode?

This might be for another thread but would a trimmer in place of the mini switch give a continual sweep between 9v and 18v?

I'm guessing some of the parts can be omitted if only inverting or only doubling? Edit: this question was answered here

Background I love the Parentheses Mini (aka Life), but bringing the octave in makes it too harsh and trebly for me, so I've been experimenting with different ways to compensate I tried a few Reutz type mods with some success, but after coming across @Chuck D. Bones ' excellent bass mod for the...

I went with 12k for R4 in the end and perceive a slight boost when engaged My use case is probably a little different to the norm, I like the trashy Belton brick sound into a dirty amp, complex reverbs can turn to mush used this way The pre-delay keeps the reverb away your playing which keeps...

@jdduffield cool thanks I'm going in now