DOD FX22 Vibro Thang

Here is a layout for the DOD FX22 Vibro Thang (Vibrato / Phasor)

04/05 Layout Updated: LM358 pin 4 and the 18K resistor from the bottom LM13600 pin 9 were connected to V+ instead of ground.

John Hollis - Easy Vibe (with mods)

Here is a layout for John Hollis Easy Vibe.
I've added Mark Hammer's anti-ticking mod and Piotr Zapart's LFO mods.
Try 5K/20M LDRs.

Madbean Wigl (Vibe)

Brian's take on John Hollis Easyvibe.
You can find his 1590G size boards on his website.
Check his original notes here for more infos on how to build this project!

 

 Here is another version with Mark Hammer's anti-ticking mod as suggested by Ciaran:

Madbean Harbinger One

This is Madbean's version of the famous Univibe pedal.
I've added a "Multi-Vibe Mod" to it.
You can find all infos on this circuit or buy one of his PCBs here:
http://www.madbeanpedals.com/projects/index.html

09/11/2016 Layout Updated! Changed the charge pump daughter board.

There's also a different but verified layout by Savvas in the Forum section.

Electro Harmonix Clone Theory

Request for this nice sounding chorus/vibe pedal.  Thanks to Scruffie for his schematic.  It will fit in a 1590B if you want the aggravation, but a 125B would probably be a better choice.

The effect needs a 15V supply so you can either use a standalone 15V adapter if you have one, or build the included power daughterboard which with double the supply and then uses a regulator to reduce it to a stable 15V.

The schematic was based on a mono version of the old MN3007 Clone Theory, but this is the manufacturers information about the current XO version:

This recreation of the original 1970's Clone Theory is re-known for its very edgy chorus. Stereo outputs provide lush chorus and vibrato with a sparkling wash and liquid elegance.

CLONE THEORY, one of the most lush, deep and warm CHORUS/VIBRATO ever made, now in stereo. The CLONE THEORY’s depth and rate controls swing from one extreme to the other, giving the user an entire realm of possibility for tone.

[20th May: re-jigged slightly reduced the number of links, no corrections were made so the first layout posted should still be good]

and here's the stereo daughterboard for those wanting the option

Runoffgroove Tri-Vibe

Great layout here by John K and a very welcome addition.

Info about this great project from Runoffgroove:

The Tri-Vibe was born from the idea of developing a true vibrato pedal that could be built without resorting to parts matching and complex adjustment procedures. Various frequency modulation alternatives were analyzed to accomplish this goal.

There are numerous pseudo-vibrato implementations built around modified chorus and phaser pedals where the dry path is canceled, leaving only the wet signal. Several shortcomings to these approaches exist, such as: non-sinusoidal modulation (a sinusoidal LFO is a must for authentic vibrato), uneven frequency modulation across the audio band, poor noise performance, limited bandwidth, and intrinsic time delay.

Delay chips such as MN3007 or PT2399 were dismissed mainly due their limited bandwidth and the intrinsic delay associated with them. The Wurlitzer vibrato was also considered, however its implementation required a rather large number of components. This left the all-pass stage alternatives. We initially thought that at least four all-pass stages might be necessary to achieve the goal of true vibrato, but after further investigation we found that as few as two all-pass stages could be optimized for linear phase variation within the guitar frequency range. This explains the unusual 15:1 capacitor ratio that sets the frequency of each stage, as this arrangement can produce a quite flat +/- 90 degree phase shift variation for frequencies between 80 Hz and 6 kHz.

In order to implement the phase shift stages, the most common options were considered for the variable element: junction field-effect transistors (JFETs), light-dependent resistors (LDRs) and operational transconductance amplifiers (OTAs). JFETs and LDRs were discarded because they have wide production tolerances that would require precise matching and/or careful adjustments. On the other hand, OTAs are reasonably matched and predictable, so no parts selection or adjustments are necessary.

Different OTAs exist, such as CA3080, CA3094 and LM13600/LM13700. We decided in favor of the LM13600 device since it includes the output buffers and contains a pair of linearizing diodes that allow an improvement in the dynamic range and S/N ratio. In addition, we added corresponding pre and de-emphasis networks at the input and output buffers to further improve the S/N ratio.

The next challenge was to generate a suitable modulation signal. As a side note, in most phaser and chorus pedals adapted for vibrato mode, the lack of "proper" modulation vs. time produces an unappealing "motion sickness" characteristic. So, starting from a conventional triangle waveform generator with a predefined output level, a pseudo-sinusoidal signal is obtained by means of a 4k7 resistor, the 10k DEPTH pot, and two back-to-back diodes. The LFO is not finished yet, for the sinusoidal control signal needs to be exponentiated to obtain symmetric phase variation at each peak of the sinusoid. This final task is performed by the nonlinear arrangement of diodes and biasing resistor in the opamp stage U2b. Again, this section of the circuit requires no component matching or adjustments.

More info here

Little Angel Chorus - Rick Holt (frequencycentral)

Another great sounding circuit here from Rick.  His explanation:

I've had the idea to try a PT2399 chorus ever since I modded my Clari into a Clari Cubed. The challenge with the PT2399 is to get the delay time as short as possible while still having some wiggle room for the LFO injected into pin 6. I've tried PNP, NPN, FET and LDR - fail! The delay time is either too short for the LFO to have any wiggle, or too long and latency is obvious.

So, screw using pin 6, just ground the MF for the shortest possible delay time and instead modulate the vref at pin2. Shortest possible delay with as much LFO wiggle as you want. In fact it has to be tamed down or you're into tape wobble type effects.

Those familiar with the PT2399 family of delays will recognise homage to Rebote and the Clari in the input buffer and output section respectively.

Demos:
http://dl.dropbox.com/u/967492/Little%20Angel%20Demo.mp3
http://www.archive.org/details/LittleAngel-Pt2399-basedChorus

 

Version 2 incorporating anti-lock fix and noise reduction measures.

Version 3 incorporating anti-lock fix, noise reduction measures and Space/Warbler switch.

Version 4 incorporating all of the above, and a Chorus/Vibe switch.

Bigfoot FX Magnavibe

I'm bored of dirt layouts (until the next one!) :o)  Check the notes on the LED/LDR