New at runoffgroove.com: Tri-Vibe

[B Tremblay]

Tri-Vibe is a versatile modulation effect that offers true vibrato.  Check it out: http://runoffgroove.com/tri-vibe.html

Four sound clips are available on the Sounds page: http://runoffgroove.com/salvo.html#tri-vibe

Happy holidays to all!

[frequencycentral]

Nice, the LFO curves are particularly interesting. Thanks ROG!

[stm]

We've been working on this project for quite a while, mainly fine-tuning the LFO shape for optimum vibrato sound and good noise performance.

Some highlights of this circuit are:
1) No trimming or matching of components
2) Noise reduction and improved dynamic range by means of pre/de-emphasis networks and use of the linearizing diodes included in the LM13600
3) LFO waveform optimized for smooth vibrato
4) Mild phaser and pseudo-leslie sounds also available

A PCB is in the works and will be added soon to the project.

Merry Christmas all!

[frequencycentral]

Put a fixed phase shift stage either side of the OTA stages and it would make a cool phaser too.

[B Tremblay]

Put a fixed phase shift stage either side of the OTA stages and it would make a cool phaser too.

That is an option that we tested and would have included if our aim had been to create a phase shifter project.  However, our focus was vibrato and added phase shift stages (fixed and/or swept) did not benefit our target sound.

[petemoore]

 Very nice !
  Beautiful sweep-tones on this one !
   

[drk]

nice sound clips!

[morcey2]

Will this work with the NJM13600D that small bear carries?  I've got an order to put in there in a couple of days and figured that I'd add a couple of they would.

It sounds really good!

Matt

edit:  So I read ALMOST all the way down to the bottom of the page before I posted this.   

[aziltz]

Hi Five!

[isildur100]

Very nice work! Congrats!   

[Ben N]

Sounds are great, and the schematic looks quite buildable. Nice.

[stm]

Will this work with the NJM13600D that small bear carries?  I've got an order to put in there in a couple of days and figured that I'd add a couple of they would.

It sounds really good!

Matt

edit:  So I read ALMOST all the way down to the bottom of the page before I posted this.   

During prototyping I used both JRC13600 (from Smallbear) and LM13700 (from a local supplier).  Both worked OK, so I'd say this covers both JRC and National Semiconductor devices, as well as both OTA flavors (with and without variable bias for the output stage).

[stm]

Put a fixed phase shift stage either side of the OTA stages and it would make a cool phaser too.

That is an option that we tested and would have included if our aim had been to create a phase shifter project.  However, our focus was vibrato and added phase shift stages (fixed and/or swept) did not benefit our target sound.

In order to have smooth vibrato, the requirement is to have even phase variations across the frequency range of interest.  This means, +/- 45º or so within a frequency range from 80 Hz up to 4kHz (for guitar).  The choice of the 15:1 ratio for the capacitors effectively optimizes this requirement.  Using equal capacitors, or adding two or more fixed stages defeats this adjustment, increasing the motion-sickness effect which we tried to avoid like the plague.

[jmasciswannabe]

Sounds killer!

[spaceace76]

awesome design! can't wait for a layout. based on the clips, the fact that it doesn't need special adjusting, and that the speed pot is single gang, i'd call this a univibe killer! Thanks again ROG

[John Lyons]

PCB coming up.
Sorry for the wait guys.
Having a two years old in your care
makes for slow work...

John

[gigimarga]

Awesome project!

Thx for it!

[Ben N]

Wait--no perf? Fom ROG?!? 

[StephenGiles]

This sounds very nice indeed. On the complexity level though, on a level of 1 to 3 I would put it at 1.5 on the basis of building straight to veroboard. I don't do veroboard layouts, I just build it!. There's too much dumbing down these days!!!

[B Tremblay]

This sounds very nice indeed. On the complexity level though, on a level of 1 to 3 I would put it at 1.5 on the basis of building straight to veroboard. I don't do veroboard layouts, I just build it!. There's too much dumbing down these days!!!

The complexity level is relative to the other projects presented at runoffgroove.com - obviously veteran builders can ignore such a rating.