ShortScale.org

Nice layout. The only thing I'd add is a switch to take the diodes out of the circuit or substitute silicon diodes - you get a bit more volume that way.

DuoSonicBoy wrote:Nice layout. The only thing I'd add is a switch to take the diodes out of the circuit or substitute silicon diodes - you get a bit more volume that way.

Yes, definately. Was thinking a switch to cut out the diodes, and I think a switch to enable a pre-boost circuit. I've enough NOS transistors to make four of these, so I'm sure it'll grow.

Mike wrote:I sent it standard Royal Mail overseas (which I've NEVER had a problem with before after sending approx 20 pedals abroad). Bizarre.

Like I said, one more week and then I'll build him a replacement.

Due to my line of business I mail anything from 3 to 20 packages a week, mainly to the US. Sometimes it takes 4 days to get there and sometimes it takes over 4 weeks, no reason for it, just random postal nonsense.

I have had packages I've sent to Canada take months. I track them to customs and then it just sits there for weeks and weeks then POP delevered.

Dinosauria wrote:

Mike wrote:I sent it standard Royal Mail overseas (which I've NEVER had a problem with before after sending approx 20 pedals abroad). Bizarre.

Like I said, one more week and then I'll build him a replacement.

Due to my line of business I mail anything from 3 to 20 packages a week, mainly to the US. Sometimes it takes 4 days to get there and sometimes it takes over 4 weeks, no reason for it, just random postal nonsense.

I have had packages I've sent to Canada take months. I track them to customs and then it just sits there for weeks and weeks then POP delevered.

I've had shit held at the canadian boarder for months, so i can definitely vouch for the suckiness timewise of our postal inspectors.

Here we are. Finished in finest blue/brown gingham with a laquer coat for longevity. The switch disengages the diodes for loud/openness. I also noticed, whilst playing it properly for the first time last night, that there's a really nice kinda compressed clean sound when you roll the gain off. Also that there's probably not too much need for an extra boost circuit after the main one.

Very nice work, Tim. Is that glued on paper + Lacquer? Your pedals are always very clean looking.

And you use those faggy LED bezels, you hipster.

I just built Zaphod's board last night with your layout (thanks again)


The section on the right is a saltbooster. If it's unnecessary I'll snap the board off before it.

Does the AC128 sond good? I've still not got round to trying one. Also just thought, how does the tone control work in your build?

re bezels- I'm not happy with this batch I bought from pedal parts plus. They let the LED stick up way too much, and the plastic bit that's supposed to hold the LED in place doesn't so it'll need a wodge of epoxy behind it (I'll take a gutshot when I open it to do this). Odd cos the LED bezels from Musikding are great. It seems a bit of fuss and the take up alot of space inside the case, so I think I'll get out of the bezel business altogether.

This baby is actually fabric covered. Stacey has loads of offcuts left over from her sewing/general clothes-making and I figured I'd give it a try. The case was sanded, primed, then PVA'd and it seems to hold the fabric well. It'll look teh cool when it starts to get distressed.

timhulio wrote:Does the AC128 sond good? I've still not got round to trying one. Also just thought, how does the tone control work in your build?

re bezels- I'm not happy with this batch I bought from pedal parts plus. They let the LED stick up way too much, and the plastic bit that's supposed to hold the LED in place doesn't so it'll need a wodge of epoxy behind it (I'll take a gutshot when I open it to do this). Odd cos the LED bezels from Musikding are great. It seems a bit of fuss and the take up alot of space inside the case, so I think I'll get out of the bezel business altogether.

This baby is actually fabric covered. Stacey has loads of offcuts left over from her sewing/general clothes-making and I figured I'd give it a try. The case was sanded, primed, then PVA'd and it seems to hold the fabric well. It'll look teh cool when it starts to get distressed.

I was just building last night. I'll be testing tomorrow morning as I'm out tonight.

I'm going to just implement a simple "Guitar style" treble roll off high-pass-to-ground arrangement. Zaphod just wanted a little bit of flexibility, not a tone stack or anything.

I did this on Doog's Saltbooster and it worked really well, he loved it. Look forward to the gut shots. I just use standard plastic 5mm bezels (6.5mm hole in the case) They work great. Some of my builds are way to tight to tart around with that bollocks.

thanks for posting this diagram. do you know what i can substitute for the 2N3565 if anything?

npn Si transistor with the same pinout, it won't be a Harmonic Perculator though.

i think i understand. thanks, mike!

r40f wrote:thanks for posting this diagram. do you know what i can substitute for the 2N3565 if anything?

Smallbear have them.

Ok so im new to circuit board building and decided to take the harmonic percolator as my first endeavor. I am going to use the layout on this forum. I am pretty confident with everything except I am unsure where my 3PDT switch gets connected. Anyone who can point me in the direction it would be much appreciated.

- Micha

Beavis audio site has good offboard wiring diagrams.

I'm confused, is this the same as the Fredric Effects Harmonic Percolator I own?

Why would that be confusing?

Knowing Tims work it probably sounds too good to be true

johnnyseven wrote:I'm confused, is this the same as the Fredric Effects Harmonic Percolator I own?

Yep, this is where Fredric Effects started. Two years and 260 pedals later the only difference with your pedals is that they use PCBs rather than veroboard and the soldering and wiring is neater.

's maybe not noticed it's a 2 year old thread.

Yeah, that is why i'm confused. I couldn't work out why Tim was posting up circuit diagrams of pedals that he's been making for ages, I thought maybe it was some new version or something - I didn't realise that it was a really old thread that had been revitalised. Thanks for pointing this out, I am a numbskull.