Interfax - Harmonic Percolator [schematic]
- Alex Frias
- Resistor Ronker
- pinkjimiphoton
- Transistor Tuner
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someone on facebook posted these pics today
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- CheapPedalCollector
- Resistor Ronker
I saw these, the schematics on the internet are totally wrong, as expected. Transistors are still unknown, they appear to be 2 of the same, not 2 different as suggested by others. The resistor values are wrong in others, and there is a diode missing. Hopefully the volume control is 100K, can't see the value of it. The Fuzz control is 60K on that unit. The ancient resistors would need measuring though and that 3rd gooped part could be a cap or a diode, not sure.
- gigelmargel
- Resistor Ronker
The diode from input to ground appears in a schematic of Alfonso Hermida: https://www.diystompboxes.com/pedals/Percolator.gif. As far as I remember, I tested it long time ago, using a switch, and didn't seem to me to make a big difference.
Anyway, these gutshots are very good. Maybe, with some luck, we will get all the values of the components
Anyway, these gutshots are very good. Maybe, with some luck, we will get all the values of the components
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They do almost look the same. The one on the right seems to have a bigger case though...at least in the second photo.CheapPedalCollector wrote: ↑24 May 2021, 18:27 I saw these, the schematics on the internet are totally wrong, as expected. Transistors are still unknown, they appear to be 2 of the same, not 2 different as suggested by others.
".....and when I'm sad......I slide!"
- monkeyxx
- Resistor Ronker
I traced this pedal based on your photos, and found that it's the "dual silicon" variant. There's a hand-drawn schematic posted probably earlier in this thread from S. Weingartner that has all the details.pinkjimiphoton wrote: ↑23 May 2021, 23:58 someone on facebook posted these pics today
191213873-10224480954828051-2160975459894285331-n.jpg190551787-10224480955388065-6998780447430839591-n.jpg190476666-10224480953868027-1031267692928278717-n.jpg190230532-10224480954068032-1037203230760261347-n.jpg190229876-10224480955068057-5537709624227342937-n.jpg188109418-10224480954348039-8409356874782713116-n.jpg187146169-10224480954588045-8638966387680971574-n.jpg
It was a fun Sherlock Holmes exercise!
- monkeyxx
- Resistor Ronker
There are 5 or more "original" variants of this pedal. As documented by Chuck Collins.CheapPedalCollector wrote: ↑24 May 2021, 18:27 I saw these, the schematics on the internet are totally wrong, as expected. Transistors are still unknown, they appear to be 2 of the same, not 2 different as suggested by others. The resistor values are wrong in others, and there is a diode missing. Hopefully the volume control is 100K, can't see the value of it. The Fuzz control is 60K on that unit. The ancient resistors would need measuring though and that 3rd gooped part could be a cap or a diode, not sure.
At least two, maybe three or four of them have been "exposed" on this very thread! many years ago by now.
But you are also wrong, the input potentiometer is indeed A100K and the output pot is indeed A50K. And the dual silicon pedal is "known." It's not the only version.
But you are right. Sadly, googling "harmonic percolator schematic/layout" brings up a bunch of error laden layouts. The BIGGEST THING missing is the 1nF cap (sometimes 1.5nF) from the transistors to ground in parallel with the 20K resistor (sometimes 91K.) I think this would have been on the bottom of the board, at least it is in the Chuck Collins pedals. But you add this capacitor and the circuit suddenly "comes to life." And stops being demented. I wish these informations could be deleted but it's too far gone, they're out there now. This has been called the "Collective Effort" schematic and it's horrible. It's missing C5 (1nF to ground in parallel with 20K resistor.) Although somebody did post a Collins build of this version. I just don't think it sounds good at all.
JJ Gabor got it right waaaaaaaay back in this very thread on the first few pages, and Brian at MadBean Pedals has got it right also in his PepperSpray pdf files, if anyone wants to reference "GOOD" schematics to build from. And of course Alex Frias has got it right in this very thread as well with Mr. Bill's "real albini" values/components. And there's the dual Si schematic from S. Weingartner to reference as well.
Harald Sabro Bolstad has a "GOOD" stripboard layout of the Albini values. Iviark's layouts are all wrong, missing the 1nF cap. I just really don't like that "Giblet schematic" and it unfortunately seems to be very disseminated.
- pinkjimiphoton
- Transistor Tuner
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- Posts: 1242
- Joined: 12 Sep 2010, 19:03
- my favorite amplifier: my own, a redesigned princeton
- Completed builds: so fucking many goddamn pedals it would make your ass hurt just looking at 'em all!!!!!
there's videos that totally suck of about 90 of 'em here:
http://youtube.com/666pinkster
gimme a like: http://facebook.com/pinkjimiphotonrocks - Location: new world order land (formerly la-la land)
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i still say my juergulator sounds better, and it gets all the same sounds and then some.
"When the power of love overcomes the love of power the world will know peace."
Slava Ukraini!
Slava Ukraini!
- monkeyxx
- Resistor Ronker
Never heard of it LOL, just teasing, I'm sure your build sounds good.pinkjimiphoton wrote: ↑15 Feb 2022, 20:27 i still say my juergulator sounds better, and it gets all the same sounds and then some.
- pinkjimiphoton
- Transistor Tuner
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- Posts: 1242
- Joined: 12 Sep 2010, 19:03
- my favorite amplifier: my own, a redesigned princeton
- Completed builds: so fucking many goddamn pedals it would make your ass hurt just looking at 'em all!!!!!
there's videos that totally suck of about 90 of 'em here:
http://youtube.com/666pinkster
gimme a like: http://facebook.com/pinkjimiphotonrocks - Location: new world order land (formerly la-la land)
- Has thanked: 358 times
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- Contact:
here ya go, 10 years after, i built a second run of them
and the original
and the original
"When the power of love overcomes the love of power the world will know peace."
Slava Ukraini!
Slava Ukraini!
- monkeyxx
- Resistor Ronker
pinkjimiphoton, good stuff! I always love when people come up with new ideas rather than being stuck on old ones. As much as it's tempting to chase the originals in this case. But you never know when your new idea might be the next big thing!