Thanks Anders! I saw the schematic for the Antichthon pop up recently and was hoping for a layout. I have a layout request for a unique pt2399 based circuit I came across: the Intensive Care Audio Fideleater. It uses an Electric Druid StompLFO chip for waveforms and tap tempo, and seems capable of lots of different sounds.
I have a theory about this...I've spent the last couple months doing a bunch of circuits inspired by the harmonic percolator, knowing nothing about this pedal, only having looked at the circuit, my guess is Catalinbread came about this through messing around with that circuit...i accidentally discovered that you can get it pretty close to faking out a univibe sound even if you tweak the two separate collector resistors in a certain way, hell, you can even get it to do massive massive massive sub octaves if you mess with those resistor values enough, and change the collector/base values as well, it's a weird wonderful thing!
Shameless plug, here's an all silicon perc variant that you can dial into univibe-ish territory that i made, probably wont become a regular build for me, but was a pretty cool discovery to come about by accident and curiosity of fiddling with the circuit
I think you're right about the fact that they were messing around the circuit. I've also been tweaking my Percolator for 2 days with many different results just by swapping the resistors with trimmers and change some values of the capacitors. The choice of the clipping diodes, as usual, is very substancial too. I subbed the germanium diodes with 2n4004 with the best result for my personnal taste. By the way, I'm sceptic about the placement of the 4K7 resistor on this schematic. I may try connecting volume 3 on the other side of this resistor (with a few tricks to the layout then) so that the resistor only acts on the clipping threshold.
Thanks for the feedback ! I absolutley need to build this one too then. I built an original percolator 3 days ago and those improvements seem worth it.
Hey guys, I have built 2 of these. For some reason both do not work as intended. But both do not work in the same way. There´s a quite clean output signal on both. Besides the volume pot only the time pot does something, a veeery long sustain. But it´s still far from what it should do. The other two pots don´t do anything remarkable. Both builds look clean without any unwanted bridges.
I´ve already replaced both transistors - still the same problem. When I unplug the power, it still works the same wrong way. It seems to be in constant bypass mode (except for the time pot). Is it maybe important, what kind of guitar I use? Any guitar should do at least anything similar to the wanted effect, right? Anyone here who experienced the same? Any further ideas?
Yeah. Someone in a Facebook group gave me the same hint. It works now but it's not really controllable. A mix knob would be fine. Any ideas how to do that?
Thanks Anders! I saw the schematic for the Antichthon pop up recently and was hoping for a layout. I have a layout request for a unique pt2399 based circuit I came across: the Intensive Care Audio Fideleater. It uses an Electric Druid StompLFO chip for waveforms and tap tempo, and seems capable of lots of different sounds.
ReplyDeletehttps://www.diystompboxes.com/smfforum/index.php?topic=102813.60
I don't understand how the Space knob can create a tremolo effect only by altering the voltage to the transistors...
ReplyDeleteI have a theory about this...I've spent the last couple months doing a bunch of circuits inspired by the harmonic percolator, knowing nothing about this pedal, only having looked at the circuit, my guess is Catalinbread came about this through messing around with that circuit...i accidentally discovered that you can get it pretty close to faking out a univibe sound even if you tweak the two separate collector resistors in a certain way, hell, you can even get it to do massive massive massive sub octaves if you mess with those resistor values enough, and change the collector/base values as well, it's a weird wonderful thing!
DeleteShameless plug, here's an all silicon perc variant that you can dial into univibe-ish territory that i made, probably wont become a regular build for me, but was a pretty cool discovery to come about by accident and curiosity of fiddling with the circuit
https://www.instagram.com/swanelectricaudio/?igshid=YmMyMTA2M2Y%3D&img_index=1
I think you're right about the fact that they were messing around the circuit.
DeleteI've also been tweaking my Percolator for 2 days with many different results just by swapping the resistors with trimmers and change some values of the capacitors. The choice of the clipping diodes, as usual, is very substancial too. I subbed the germanium diodes with 2n4004 with the best result for my personnal taste.
By the way, I'm sceptic about the placement of the 4K7 resistor on this schematic. I may try connecting volume 3 on the other side of this resistor (with a few tricks to the layout then) so that the resistor only acts on the clipping threshold.
I confirm that Volume 3 on H15 is a better place for me. More volume, less compression.
Delete2*1N4007 for the clipping on mine.
Here 's an "acid test" on my Instagram :
https://www.instagram.com/reel/CyOK_Ktsabo/?utm_source=ig_web_copy_link&igshid=MzRlODBiNWFlZA==
Tag this one Anders, sounds exactly like this demo:
ReplyDeletehttps://www.youtube.com/watch?v=uvUZcRTf4rc
My PNP was something Soviet with an hfe of about 65
Well worth a build by the way, it has a ton of sounds in it and its a decent fuzz
DeleteThanks for the feedback ! I absolutley need to build this one too then.
DeleteI built an original percolator 3 days ago and those improvements seem worth it.
Is the sweep of the gravity pot good enough ?
DeleteI guess a C taper would be better placed here.
I think the B taper is fine but anything is worth a try
DeleteYes actually B or even A taper are way better !
DeleteHey guys,
ReplyDeleteI have built 2 of these.
For some reason both do not work as intended. But both do not work in the same way. There´s a quite clean output signal on both.
Besides the volume pot only the time pot does something, a veeery long sustain.
But it´s still far from what it should do. The other two pots don´t do anything remarkable. Both builds look clean without any unwanted bridges.
I´ve already replaced both transistors - still the same problem.
When I unplug the power, it still works the same wrong way.
It seems to be in constant bypass mode (except for the time pot). Is it maybe important, what kind of guitar I use? Any guitar should do at least anything similar to the wanted effect, right?
Anyone here who experienced the same? Any further ideas?
Hi mate, what transistors did you use?
DeleteHi! I am in the same situation. Did you solve it?
DeleteCheck your transistor pinout, make sure you use PNP. You can control the tremolo effect using the guitar volume knob
DeleteI have a PN2222 and I see is NPN. Does PN2222 PNP exist or should I use an equivalent?
DeleteQ1 is germanium PNP and Q2 is silicon NPN (PN2222)
DeleteOk, for the germanium one I’m using GT308B, the tia supposed to be PNP
DeleteGT308B is PNP so you are good
DeleteI am not able to make it work. Anyone ca share a picture of the build?
DeleteHi. A GT308 with 60-70 hfe and a 2n2222. I just turned the 2222 due to the pinout. Someone in a Facebook group told me to do so. Did not help.
ReplyDeleteHave you checked the pinout of your GT308, I think they are BCE whereas the picture above shows CBE so you just need to move the legs around
ReplyDeleteYeah. Someone in a Facebook group gave me the same hint. It works now but it's not really controllable. A mix knob would be fine. Any ideas how to do that?
ReplyDelete... I mean a mix button to mix it with the clean signal...
ReplyDeleteNo idea, you could add a blend control with this;
Deletehttps://tagboardeffects.blogspot.com/2012/01/mini-blend-jfet.html
Thanks!
Delete