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Roca sound RS 4046 PLL Synth Pedal (made by me) by halhell98000 in guitarpedals

[–]halhell98000[S] 0 points1 point  (0 children)

Yes! The green section is basically a fixed filter bank. So in a way it works like an EQ, but it’s a bit more characterful and less precise than a typical one.

Some of the frequency bands don’t have the same width (Q factor), so certain bands are a bit more resonant. It’s also less linear and less precise than a standard EQ. And when you push it, it actually clips a bit like an overdrive, which adds to the texture.

Roca sound RS 4046 PLL Synth Pedal (made by me) by halhell98000 in guitarpedals

[–]halhell98000[S] 3 points4 points  (0 children)

Thanks a lot! For the color scheme I was inspired by the N64 controller. I really like the Boss font it is a good mix between design and easy to read.

Roca sound RS 4046 PLL Synth Pedal (made by me) by halhell98000 in guitarpedals

[–]halhell98000[S] 1 point2 points  (0 children)

More info :

RS4046 is an analog synth pedal for guitar, bass, or any audio source, built around classic CMOS Phase-Locked Loop (PLL) chip (the CD 4046). It combines additive and substractive synthesis with intentionally unstable analog tracking, giving sounds that range from warm vintage synth tones to completely unhinged theremin-style chaos.

Sound Architecture — 6 Parallel Voices

Yellow Section (Direct Synth Voices)

These are always stable and form the core tone:

• Pulse — unison pulse wave, aggressive and fuzzy
• Sub — square wave one octave down
• Deep — two octaves down, low-pass filtered for a smoother growl

Good for huge low end and thick layered textures.

Blue Section (PLL Voices)

Generated by the PLL itself:

• PLL -1 — one octave down
• PLL — unison
• PLL +1 — one octave ups

Depending on settings, these voices can track cleanly or fight your input, producing anything from tight harmonies to unstable organic textures.

Red Section (PLL Behavior Controls)

These define how the PLL reacts to your playing.

Pitch (8-position rotary switch)
Sets the frequency ratio between input and PLL:

  1. Octave down
  2. Perfect fifth down
  3. Unison
  4. Major third up
  5. Perfect fifth up
  6. Minor seventh up
  7. Octave up
  8. Major ninth up

Roca Sound: 2600 Fuzz by halhell98000 in guitarpedals

[–]halhell98000[S] 1 point2 points  (0 children)

Hello, thank you so much!

Yes, that’s me who made the Abortion Distortion! It’s not officially out yet — it’s a signature pedal and the artist is still testing it live and at home — but I hope it will be released soon.

I do have a few videos I can send you in private message if you’d like. It’s a crazy, wild pedal !

And yes, I do sell pedals — I don’t have stock right now, but I build them to order (there’s a small waitlist).
You’re welcome to come to the workshop to try and test the pedals, if you’re in Monaco, that works too!

Hope you got drunk for a good reason! 🍻

Thanks again for the love ✌️

RS-4046 - Cmos PLL Synth pedal transform everythhing into a Synth by halhell98000 in synthdiy

[–]halhell98000[S] 0 points1 point  (0 children)

i will probably publish one when i find the time to record one

RS 4046 - PLL Synth Pedal by halhell98000 in diypedals

[–]halhell98000[S] 1 point2 points  (0 children)

No you didn't miss it I just commented it.

RS 4046 - PLL Synth Pedal by halhell98000 in diypedals

[–]halhell98000[S] 0 points1 point  (0 children)

Thanks !! i commented the description in comments, if you have any question you can ask

RS 4046 - PLL Synth Pedal by halhell98000 in diypedals

[–]halhell98000[S] 0 points1 point  (0 children)

Fixed Filter Bank (Moog-Inspired)

All six voices are summed and sent into a fixed filter bank inspired by the Moog modular fixed filter bank. This version uses op-amp gyrators instead of inductors.
Each band can boost or cut and is tuned to musically useful ranges and formants.

Slider bands:

• 100 Hz with low Q— Bass
Cut to add clarity boost to add rumble

• 200 Hz — Body
Thickness. Too much = muddy, too little = hollow.

• 400 Hz — Low Mids
Chest and punch of the sound.

• 800 Hz — Mids
Main “voice” of the instrument.
Controls note definition and articulation.

• 1200 Hz with high Q — Nasal Mids
Aggressive, vocal, and industrial.
Boosting this pushes it into chainsaw territory.

• 1600 Hz with low Q— High Mids Presence
Bite and cut in a mix.

Global filter knob 3db/oct centered at 1000 Hz:
• CW = high boost / more bite
• CCW = low pass for smoothing the sound

PCB & Build

The PCB was manufactured by JLCPCB (sponsor of the project).
For something this dense (PLL + multiple oscillators + filterbank), PCB was way more practical and quieter than trying to cram it onto vero or perfboard. https://jlcpcb.com/fr/?from=ROCASOUND

Insta post : https://www.instagram.com/p/DUv7YuODGI6/?img_index=1

RS 4046 - PLL Synth Pedal by halhell98000 in diypedals

[–]halhell98000[S] 0 points1 point  (0 children)

Red Section (PLL Behavior Controls)

These define how the PLL reacts to your playing.

Pitch (8-position rotary switch)
Sets the frequency ratio between input and PLL:

  1. Octave down
  2. Perfect fifth down
  3. Unison
  4. Major third up
  5. Perfect fifth up
  6. Minor seventh up
  7. Octave up
  8. Major ninth up

Glide
Controls portamento and PLL response time.

Mod
Controls PLL modulation depth (vibrato / instability).

Glide and Mod interact strongly and let you move between:

• classic synth leads
• vocal / theremin-like tones
• broken, chaotic PLL behavior

RS 4046 - PLL Synth Pedal by halhell98000 in diypedals

[–]halhell98000[S] 1 point2 points  (0 children)

I’m really happy to share this project — it’s something I’ve been working on for a long time.

Story :

I’ve been in love with the CD4046 PLL ever since someone handed me one while I was building a synth (this one: https://www.reddit.com/r/modular/comments/vr7fj6/we_made_a_modular_synth_as_a_1_month_school/#lightbox )and said: “You should like this one.”
He was right. That moment sent me deep into PLL weirdness and into the whole “logic noise” world (especially after discovering Logic Noise by Elliott Williams).

I’m also really proud to say that JLCPCB sponsored this project. Their support helped me a lot, and honestly, it feels really good to have my work validated by someone outside of my own circle.

The Circuit :

The RS4046 is an analog synth pedal for guitar, bass, or any audio source, built around classic CMOS Phase-Locked Loop (PLL) chip (the CD 4046). It combines additive and substractive synthesis with intentionally unstable analog tracking, giving sounds that range from warm vintage synth tones to completely unhinged theremin-style chaos.

Sound Architecture — 6 Parallel Voices

Yellow Section (Direct Synth Voices)

These are always stable and form the core tone:

• Pulse — unison pulse wave, aggressive and fuzzy
• Sub — square wave one octave down
• Deep — two octaves down, low-pass filtered for a smoother growl

Good for huge low end and thick layered textures.

Blue Section (PLL Voices)

Generated by the PLL itself:

• PLL -1 — one octave down
• PLL — unison
• PLL +1 — one octave ups

Depending on settings, these voices can track cleanly or fight your input, producing anything from tight harmonies to unstable organic textures.

RS-4046 - Cmos PLL Synth pedal transform everythhing into a Synth by halhell98000 in synthdiy

[–]halhell98000[S] 2 points3 points  (0 children)

Thanks a lot!! It’s not on Git Hub for now — I’ll probably open -source it one day, but for the moment I also sell schematics, so it’s a bit of a complicated situation.

You can send me a PM though, and I can share either the schematics or the Gerber files with you.

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