Raygun Youth Chaos Fuzz
Here's another original of mine, the "Raygun Youth Chaos Fuzz". It's a very synthy and totally insane octave fuzz - an aquired taste for sure, but noise freaks should like it. :)
It's loosley based on a circuit by Nicolas Collins from his excellent book "The Art of Hardware Hacking". A comparator turns the guitarsignal into a squarewave that triggers a Phase Locked Loop Oscillator. I could go on explaining how it works, but it's better that you just listen.
This circuit works best with the neck-pickup and tone turned down on your guitar. In the video i'm using humbuckers (Gibson SG) and i'm playing the same riff over and over so you can get a sense of how the circuit reacts in different modes. The pot called "disorder" slows down the PLL tracking and goes from fast to slow. When tracking is slow it's mostly noise... The first mode is straight analog comparator fuzz and thus not effected by the tracking control.
The name Raygun Youth Chaos Fuzz is a tribute to one of my favourite punk-bands. Yes, I know it's a bad pun, but I couldn't help myself... :) Aslo, the word Raygun is kinda fitting with some of the sounds it can make. Two thumbs up to anyone that understands the graphics play...
1/7/2015 12:25:31 am
1/7/2015 05:02:18 am
1/10/2015 01:30:15 am
My build makes "sputtering" noises for lack of a better term. Is this normal? I don't hear those noises on the demo video. If used with a noise gate, the sputtering would go away.
1/10/2015 07:34:21 am
1/10/2015 10:16:34 am
Thanks for the quick reply :)
1/10/2015 05:52:59 pm
That's strange. The filter at op-amp stage 2 along with the 100K resistor going to ground at the CD4046 input should prevent false triggering that could result in sputtering, so there must be a different problem. Don't know really what to look for then. Sorry, maybe you could ask in the Raygun thread on freestompboxes, since a few people there has built it with success.
1/10/2015 07:22:05 pm
I think I've solved the problem. I think the sputtering was due to the way I was playing the guitar. Once I started muting the strings better and playing single note lines, the sputtering cleaned up well.
3/29/2015 06:23:10 pm
3/29/2015 08:50:52 pm
Thanks! I'm glad you like it. :) Haha, testing after midnight is dangerous. I've done it many times. :P
12/1/2015 04:53:53 am
Great Pedal, I just finished soldering and it worked immediatly. I've done a little MOD some floks might like too: I used some previously unused pins of the rotaryswitch to select one of four LEDs.
12/1/2015 05:09:51 am
12/9/2015 12:02:21 pm
Whoa!This is a truly insane fuzz!Just finished up a PCB build of it!
12/9/2015 03:37:43 pm
Haha. :D I'm glad you like it! It's not for the faint of heart :)
3/22/2017 10:36:17 pm
Dude let me just start by saying holy fing sh@t balls batman!,,, before a built this in the vero layout I had a face ............ now I have nothing due to my mind exploding,,,,,
3/28/2017 01:44:20 am
Haha, thanks! That's probably the best "review" I've ever gotten. ;) Cheers / Fredrik
4/6/2017 04:49:51 pm
I recently made a clon of this little monster, so i started to hack the circuit and found something interesting sounds... i just put simple switches between the Input point and pins 1,2 or 3 of the rotary switch, and i get diferent types of siren-like sounds. I will add momentary switches in my pedal to use this noises while i play my guitar This circuitl its an ears destruction weapon!!!
4/12/2017 04:55:08 am
10/14/2017 07:28:16 am
Hello. I built this wonderful box of chaos). This is really something! But there is a problem: at positions 1 and 4, everything works fine, for 2 and 3 it also works, but with some kind of clipping. Built theremin fuzz
12/2/2017 04:16:41 pm
I built one finally. It's such a great pedal, lots of fun. A couple of the settings remind me of the Repeater PLL 2.0.
12/4/2017 01:48:17 pm
11/26/2019 04:02:52 am
Hello My name is Takahashi. I made Raygun Youth Chaos Fuzz. The operation seems to be fine, but the stun sound is strange. It wo n’t sound like you ’re playing on video. Specifically, it is a blurry sound with no sharpness. There is no gate feeling. What is the cause?
11/26/2019 02:49:25 pm
4/11/2020 03:56:06 am
4/14/2020 02:53:54 am
4/24/2020 12:37:43 pm
One more question tho, in your design, the feedback resistor 100k on IC2B of the Opamp, can you explain to me why it's connected to the input resistor rather than the inverting input of the op amp?
4/25/2020 07:45:21 am
The second op amp stage feedback resistor follows the typical topology of a second-order MSB (multiple feedback) lowpass filter, so google on those and perhaps you'll find a good explanation. I've never analyzed that part of the schematic in depth, except for boring component calculations for cutoff frequency.
4/27/2020 07:25:56 am
Thanks for the explanation!
2/19/2022 08:20:16 am
Hi Fredrik! I tried this mod since I wasn’t getting signal on higher notes. It definitely solves that issue, however, I’d like to tweak the gate level since even when not playing, I’m getting noise. How could I achieve this?
11/30/2021 07:14:29 pm
Hello! I have built the vero version of this pedal and I'm getting a great sound for stun. I'm getting extremely low output for positions 2 and 3 on the switch and nothing for four. I'm troubleshooting with an audioprobe and I'm getting signal before and after C2, but I'm getting no signal at all after R3 (47k) Is that typical?
7/21/2022 07:22:22 am
I built the Raygun on Vero, and I just have one problem. Position 1 works fine, but when I switch to either 2-3 or 4, I get siren noises. They go away when I mute the strings, but it comes back and varies. Underneath those noises, the modes seem to be workin as intended. Any idea where to look to first? Bad 4046?
8/7/2022 08:49:06 am
I posted back in November and eventually solved my problem. I had forgotten to cut a row. It had been marked on the front but just fully connected on the back. It works super well now.
8/15/2022 06:47:59 pm
Thanks for your reply. Visual inspection seems fine, but I'll do a deeper troubleshooting once I tried swapping the 4046 ;) (I had added oit to a parts order that should come in next week).
11/10/2022 06:22:34 pm
I built mine a few years back. Any screw ups i had were when i tried wiring up the jacks and switch properly as a total noob. An experienced eye straightened me up 30 seconds.. Just a vero build. Super fun! Fired it up last night and i was blown away by it. Theres definitely some doom to be found. Years later i still love this pedal. Thanks for creating this resource.
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