The D.I.Y. FX Pedal Building Thread

[DrNomis_44]

pretty cool sounding pedal Doc, so you didn't touch the tremelo that is all the pedal the vibrato sounds ?

Yep, what you hear in that demo is all done by the pedal, I didn't use the trem bar at all, at slow speeds the Vibrato mode tends to sound a bit seasick-ish, but it starts to sound a bit more like a vibrato effect as you turn up the effect speed, the other mode, Chorus, is actually a Phaser effect meant to replicate the sound you get when playing through a Leslie Rotating Speaker, you'll notice that the effect becomes more prominent as the speed of the effect increases, this is normal behaviour and original Univibes behaved that way too.


Jimi Hendrix most likely used the Univibe on some songs he recorded in the Band Of Gypsys to give his guitar a kind of underwater-like sound.

A good example is his song "Machine Gun".

[kimball492]

Doc do have a ground loop hum eliminator. It would tidy up your sound much. You could probably build one in your sleep lol, if you don't already have one.

[DrNomis_44]

Doc do have a ground loop hum eliminator. It would tidy up your sound much. You could probably build one in your sleep lol, if you don't already have one.

I agree, I definitely need a ground loop hum eliminator, I think half the hum is being generated by the Univibe and half of it is from the guitar, I might see if I can get the Univibe a bit more quieter, might take a bit of work.


A hum loop eliminator could be a good DIY project for me to tackle at some stage.

[kimball492]

Doc I'd just make up a guitar cable with a resistor and capacitor in it. Much easier cost you a couple of dollars and I think you'll find it cleans it up so you won't have to touch the uni vibe. It basically works as a hi pass filter

[wokkaboy]

good tip KB, have you got one of these guitar cables and does it lower the hum ?

PBG forums have been brought to you by the Doc/KB and Woks show todaz haha

[DrNomis_44]

Doc I'd just make up a guitar cable with a resistor and capacitor in it. Much easier cost you a couple of dollars and I think you'll find it cleans it up so you won't have to touch the uni vibe. It basically works as a hi pass filter

Or, I could build the resistor and cap into a Diecast Aluminium box and put it between the Univibe and the guitar.

[DrNomis_44]

good tip KB, have you got one of these guitar cables and does it lower the hum ?

PBG forums have been brought to you by the Doc/KB and Woks show todaz haha

Hahahaha....good one Wokka.

[wokkaboy]

Doc is there space to put the resistor and cap in the univibe box ? Save having another box on the ground to trip over

[kimball492]

It does make a huge difference I made a couple years ago Woks. The box is a great idea Doc. The great thing about putting it in a cable is even if your at a buddies you can take the cable with you. Make both Doc lol. Not the best video but gives you an idea.
http://youtu.be/VzKQv5-UnAU. I built a couple about 15 years ago because of the house I had then had terrible ground hum noise. In truth I'm not sure what values where Doc as it was so long ago. I think one of the videos above has one showing values. Hope it helps.

[DrNomis_44]

Doc is there space to put the resistor and cap in the univibe box ? Save having another box on the ground to trip over

I suppose I could give it a try, but putting the resistor and the cap in a box is an intriguing idea, I'll have to do some research and internet searching about it.