Easy Vibe Tremolo Mod?

[Kevin Mitchell]

Hey everyone. Ever since my first easy vibe build I have been wondering if it were possible to implement a tremolo like effect as an addition to the chorus & vibrato. Last night I've dug up this page describing a stock Univibe with a tremolo setting and how one has implemented it into the Neo Vibe.

I'm not as savvy or experienced as most of you reading this so I was hoping I could shoot ya this idea and where I'm going to start regarding implementing this mod into the Easy Vibe.

After studying and comparing I can see that the tremolo effect is implemented by taking the cap after the 1st LDR and putting it to ground after a resistor and cap - instead of going back into the input stage as normal. The output of the tremolo seems to be after the 1st phase stage right before it goes to to the LDR of the 2nd phase stage.
Yes, I know it's not a phaser but idk how else to describe the 4 stages. "Not so phase stage"?

Observing Hollis's Easy Vibe schematic it's clear enough for me to understand how to implement this -to a degree- to the easy vibe. I have the easy vibe bread boarded with the ramping switch but I'm going to clear the board and figure this one out. Any thoughts or suggestions would be appreciated.

[Kevin Mitchell]

I've been working on this for a while now. Mostly working out the mod method and some additional switching to the circuit. This mod is unverified and based off of the RM Voodoo Vibe.

I hope everyone can comprehend the rotary connections. Just copied some notes I've worked out this morning for the switching connects. This is not the final workings. There are some more parts that need to be added - mostly some additional resistors to ground.



Any alternative/minimal switching ideas for this? I'd rather use a toggle but any part that fits is above $30 and tend to be a little too big in size

I'll be back after a lot of bread boarding.

[Jay]

I've been thinking recently about trying this too.  I built an Easyvibe many years ago and not long after went the whole hog and built a Univibe.  So the Easyvibe has largely sat in a cupboard ever since!  It's handy for occasional gig use on a pedalboard though and mine is sat next to a homebrew trem pedal so I was considering combining the two to save space. 

If you have it breadboarded you can try that first, without a switch.  If it works and you like it then you can decide what kind of switch and spend the money if it's worth it.

Let us know how you get on!

Good luck.