I have been working with this circuit and have had some interesting results with it, this video unlocked a change that makes the output level much more useful in a pedal chain, going with 47k instead of the usual 91k for R3 as Land Devices does is a simple fix for what some people have complained about in the past. I also have added a bias control and switching between different types of clipping or bypass. There’s a lot of different takes and opinions about how to make an accurate reproduction and my take on it has borrowed from at least 5 different ways that are out there. It’s quickly become my favorite fuzz pedal and it’s definitely one that lends itself to writing great riffs!
@@Lantertronics thank you, I grew up in the 70’s surrounded by electronics components, testing equipment that was probably used in WWII, and various repair and build jobs that my father was constantly working on, trips to radio shack were akin to trips to the toy store for me. I appreciate your series and how it focuses on so much of the technology that I interact with as a professional musician and producer. Would love to have a conversation about some of the more interesting things that are going on in the industry today.
This is a great series, really A+ idea and explanation. Might be cool to hook the pedals to an O-scope to show what they do in terms of the time domain and their sine wave visual. Just an added bonus, your format is stellar how it is. Just some unsolicited suggestion I felt was worth mentioning lol!
This is a great channel: You take things apart that are very interesting - I also enjoy the informed commentary. Any chance you could take a look inside an EAE Longsword - there appears to be quite some interest in the EAE Longsword. Thx.
A video on the latent lemon hurts would be phenomenal if you could get one, it does that lower harmonic thing in some of the videos I've seen that I couldn't get my clone to do. I'm wondering if it has a tantalum 47uf or electrolytic, I've heard the tantalum makes the lower harmonics come out for some reason
From everything I've read, and the few I've made myself, probably an MP16B for Q1. I think I remember it having the closest specs to a 2N404/404a but it's a pretty forgiving circuit and even PNP silicon sounds pretty good in that position.
Great video! I've wanted to see the inside of one of these for awhile now to see how it differed from any other Harmonic Percolator, and I'm glad for the opportunity!
Interfax was located in the same building as systech and proco in the beginning they only made a few things and werent around very long same with systech and alot of carlsbro pedals from England seem to use the same enclosure as the systech pedals but no one knows much about either company i guess the guy was a whacko at interfax yet he figured out how to make germanium and silicon transistors to work together so he must have been smarter than people thought
You didn’t play it! Even ten seconds at the end would have been rad. I really enjoy your, and these types of videos. What id love to see would be more of an explanation for how the circuits work as well- I’m very useless at electronics and I think you’d be able to explain why that resistor ties the circuit to ground at that point and what its purpose is extremely well. 🎉
I assume you're referring to the 22k resistor connecting the collector of the PNP transistor to ground. That resistor plays a small part in the larger transistor gain structure, which he shows at 5:01. It works with the 22k resistor at the top to bias the transistors closer to the center of their operating windows, giving them more headroom to create gain without unwanted clipping. Of course, both of these transistors being completely different, they have different operating windows, so them being connected together means that they can't be perfectly biased. This creates asymmetrical clipping when the gain is turned up, which is exactly what we see in the video. In the original circuit, there are hard clipping diodes right before the volume pot, one of them having a 4k7 resistor in series before the anode. This creates asymmetrical clipping as well, accentuating that super harsh and biased sound that the HP-1 is known for.
I’d love to see you take apart something from Electrofoods… their pedals are anarchy on the inside. Little Pig is their HP-style pedal, but Napenthes is probably their most well known pedal.
Hey brother great stuff. We appreciate you going through the effort to share this with people interested. How about doing the catalinbread karma suture if it comes your way.
I recently had a student build the "Harmonic Jerkulator" on the breadboard and we took some measurements. It's called "Harmonic Jerkulator Measurements on the Breadboard" (I'm listing the title so people can search for it instead of the link since RUclips sometimes eats links).
Very cool I'll check that out. BTW, I saw the comment thermaniacs made on your video. I do have a different HP schematic that shows a 1nf cap in parallel with the clipping diodes. I assume that's the cap allegedly missing from the schem we showed. It's possible that cap was omitted on certain units, in other words both schems may be correct.
most dirt pedals are simple bud. These are hand assembled in California so it depends how much of a premium you put on that. You could make your own but it wouldn't cost that much less, especially if you factor in the hours. If you want a $30 plastic Behringer the option is there
First time hearing about guitar pedals? Only reason I started learning to put pedals together is because of the crazy prices some of these go for. It's bonkers man
@@wookiewhat Electrofoods Pig Pile. It's wild. Unfortunately they haven't made a run of them in a LONG time. I would check out the clubber lang from malaise forever!
Oh hai, professor who did the analysis here. Thanks for the shout-out! :)
you rule
@@PacificNatureTV Thank you for your kind words! :)
I have been working with this circuit and have had some interesting results with it, this video unlocked a change that makes the output level much more useful in a pedal chain, going with 47k instead of the usual 91k for R3 as Land Devices does is a simple fix for what some people have complained about in the past. I also have added a bias control and switching between different types of clipping or bypass. There’s a lot of different takes and opinions about how to make an accurate reproduction and my take on it has borrowed from at least 5 different ways that are out there. It’s quickly become my favorite fuzz pedal and it’s definitely one that lends itself to writing great riffs!
@@spacewolf9585 That's awesome! :)
@@Lantertronics thank you, I grew up in the 70’s surrounded by electronics components, testing equipment that was probably used in WWII, and various repair and build jobs that my father was constantly working on, trips to radio shack were akin to trips to the toy store for me. I appreciate your series and how it focuses on so much of the technology that I interact with as a professional musician and producer. Would love to have a conversation about some of the more interesting things that are going on in the industry today.
Great idea for videos I will definitely be watching!
Just love how adept you are at taking apart (and putting back together correctly) these tiny devices. Your time lapse dis/assembly is really cool.
Thank you!
Do Fjord Fuzz the Freia one please!
Thanks so much for doing this! Have been curious about the HP-2 for a while but don't trust myself enough to take mine apart 😂
Couldn't have been more timely. I was just about to start buying parts for one when I saw the upload. Thanks for putting this up!
Thanks!
This is a great series, really A+ idea and explanation. Might be cool to hook the pedals to an O-scope to show what they do in terms of the time domain and their sine wave visual. Just an added bonus, your format is stellar how it is. Just some unsolicited suggestion I felt was worth mentioning lol!
This is a great channel: You take things apart that are very interesting - I also enjoy the informed commentary. Any chance you could take a look inside an EAE Longsword - there appears to be quite some interest in the EAE Longsword. Thx.
A video on the latent lemon hurts would be phenomenal if you could get one, it does that lower harmonic thing in some of the videos I've seen that I couldn't get my clone to do. I'm wondering if it has a tantalum 47uf or electrolytic, I've heard the tantalum makes the lower harmonics come out for some reason
From everything I've read, and the few I've made myself, probably an MP16B for Q1. I think I remember it having the closest specs to a 2N404/404a but it's a pretty forgiving circuit and even PNP silicon sounds pretty good in that position.
Great video! I've wanted to see the inside of one of these for awhile now to see how it differed from any other Harmonic Percolator, and I'm glad for the opportunity!
Thanks!
Interfax was located in the same building as systech and proco in the beginning they only made a few things and werent around very long same with systech and alot of carlsbro pedals from England seem to use the same enclosure as the systech pedals but no one knows much about either company i guess the guy was a whacko at interfax yet he figured out how to make germanium and silicon transistors to work together so he must have been smarter than people thought
You didn’t play it! Even ten seconds at the end would have been rad.
I really enjoy your, and these types of videos. What id love to see would be more of an explanation for how the circuits work as well- I’m very useless at electronics and I think you’d be able to explain why that resistor ties the circuit to ground at that point and what its purpose is extremely well. 🎉
I assume you're referring to the 22k resistor connecting the collector of the PNP transistor to ground. That resistor plays a small part in the larger transistor gain structure, which he shows at 5:01. It works with the 22k resistor at the top to bias the transistors closer to the center of their operating windows, giving them more headroom to create gain without unwanted clipping. Of course, both of these transistors being completely different, they have different operating windows, so them being connected together means that they can't be perfectly biased. This creates asymmetrical clipping when the gain is turned up, which is exactly what we see in the video. In the original circuit, there are hard clipping diodes right before the volume pot, one of them having a 4k7 resistor in series before the anode. This creates asymmetrical clipping as well, accentuating that super harsh and biased sound that the HP-1 is known for.
That other transistor looks just like a GT308b (or GT308v) - which is a common russian germanium transistor that can be used used in some fuzz clones
I'll have to compare the older through hole circuit boards to this hybrid SMD/through hole circuit board.
All that space and it's surface mount. Tragic. Thank God I make my own pedals.
the box of the original HP is like the boxes of mythical LoveTone pedals (same maker I suppose (?))
Germanium diodes look like soviet D310 (Д310)
Loving your channel. How would you recommend going about starting to learn about circuits like this (pedals in general)?
Theese look like Д310 (D310) russian germanium diodes
Thanks!
I've got a pack of these left on my work from soviet times
I’d love to see you take apart something from Electrofoods… their pedals are anarchy on the inside. Little Pig is their HP-style pedal, but Napenthes is probably their most well known pedal.
Yep got them on the list, thanks!
Hey brother great stuff. We appreciate you going through the effort to share this with people interested.
How about doing the catalinbread karma suture if it comes your way.
Thank you, noted!
I recently had a student build the "Harmonic Jerkulator" on the breadboard and we took some measurements. It's called "Harmonic Jerkulator Measurements on the Breadboard" (I'm listing the title so people can search for it instead of the link since RUclips sometimes eats links).
Very cool I'll check that out.
BTW, I saw the comment thermaniacs made on your video. I do have a different HP schematic that shows a 1nf cap in parallel with the clipping diodes. I assume that's the cap allegedly missing from the schem we showed. It's possible that cap was omitted on certain units, in other words both schems may be correct.
@@graybenchelec Ah, that is useful information!
You're channel rules btw😎
Thanks!
👍👍👍👍
Amazingly simple for a pedal at that price 😵
It’s not that expensive of a pedal
@@PuttinOnTheRiffs Man, it's 220$
@@josearjona3728 yea. It’s a great pedal tho. Many pedals aren’t that involved and cost 200.
most dirt pedals are simple bud. These are hand assembled in California so it depends how much of a premium you put on that. You could make your own but it wouldn't cost that much less, especially if you factor in the hours. If you want a $30 plastic Behringer the option is there
First time hearing about guitar pedals? Only reason I started learning to put pedals together is because of the crazy prices some of these go for. It's bonkers man
あなたの使っているライトグリーンのボックスレンチはどこで買えますか？とても欲しいです。
ここにあります：peperspedals.bigcartel.com/product/rocket-sockets
@@graybenchelec ありがとうございます。
@@tetora3786 ノープロブレム
Stealing a circuit and then covering up what everything is. Gross. Glad I bought a different perc clone.
is it gooped, tho? where?
Which did you buy? I'm in the market for one, might just build a clone myself if I can't find something reasonable
@@wookiewhat Electrofoods Pig Pile. It's wild. Unfortunately they haven't made a run of them in a LONG time. I would check out the clubber lang from malaise forever!
@@ohpotatoesandmolasses stealing... something that's no longer in production?
@@ohpotatoesandmolasses thanks for the tip on the Clubber Lang!