Little VOODOO VIBE project by Kaputepalla

KT66 · Post by **KT66** » 20 Sep 2007, 06:38

greenskull wrote:Very interesting to see the stage caps graph!!
I wonder if it would be easier to find a suitable photocoupler than rolling my own. Something tells me my build will be packed with sockets!!
Good to see these latest discussions, gentlemen.

if you wanted to use a vactrol a VTL5C3 would be perfect at its 30k immediate darkness resistance with 35ms decay.

kt!

alessandro · Post by **alessandro** » 20 Sep 2007, 10:14

Hey guys!Original voodoo and little voodooovibe has 5mm led not 3mm!Attention please!KAPUTEPALLA!

alessandro · Post by **alessandro** » 20 Sep 2007, 10:27

Hi bajaman!All the values i wrote in the project was accurately transcribed with the original device RM VV open in my hand!If you want to experiment with other caps and other led or ldr listen before to the original so you can really compare it with your mod!Tell me what's the best caps mix you have put in your own device so i can compare it!CIAO BY KAPUTEPALLA!

KT66 · Post by **KT66** » 20 Sep 2007, 10:48

edit: post irrelivent now messages moved to correct thread

thanks
kt!

KT66 · Post by **KT66** » 20 Sep 2007, 11:41

modman wrote: Somebody posts a complete project and you start working off an unverified schematic? Check the first message in THIS thread.

this thread has posts relating to the voodoovibe and the memory man. im not sure why the two are tangled up?? maybe a problem with the database??

this is why am confused as to his statements about ommiting parts. i just wanted to know if he was refering to the memory man or the voodoo vibe.

there is no reason to be rude.

kt

bajaman · Post by **bajaman** » 20 Sep 2007, 12:03

HI Alessandro
I used the capacitor values in your project but was very disappointed with the results - graet project by the way - just the vibrato sounded awful and the chorus sounded like a bad acid trip - the only thing that sounded really nice was the tremelo, that is why I started looking at different capacitor values and in particular the 3rd one in the sequence (47n).
All the other Univibes use a 470p here so that is what got me wondering.
The capacitor values I chose to use by plotting on logarithmic x axis graph paper (before i discovered the multiplier) were eveny spced linearly on this logarithmic axis. I kept the same order - here is what I have in my little voodoo vibe in this order - 15n, 100n, 470p, 2n7.
I am absolutely amazed at how good these values sound - even the vibrato is now usable effect - all the bias, symmetry and intensity pots work much much better than the original values - hell, I took it along to my band practice tonight and I didn't turn it off!!!!!!!!!!
The other guys were most impressed with the sound I was getting from it - EVEN the drummer!!!!
I was going to try 15n, 100n, 330p, 2n2 (6.66 for the multiplier

) but I may just leave the ones in there for the meantime - it sounds so much like a rotary speaker cabinet too - fantastic

Thanks for all your work on this my Italian friend, and try my capacitors - let me know what you think - Bernardduur liked them too.
cheers
bajaman

alessandro · Post by **alessandro** » 20 Sep 2007, 12:18

First i answer to KT66:there're 2 type of regular 5mm commercial led,dark yellow(seems like internally the plastic is painted) and clear bodied yellow (transparent yellow plastic) and this is the kind of led used in the original RM VV!
Hey bajaman thanks for your mod and i'll try to put it into my little VV!CIAO by KAPUTEPALLA!

KT66 · Post by **KT66** » 20 Sep 2007, 12:41

alessandro wrote:First i answer to KT66:there're 2 type of regular 5mm commercial led,dark yellow(seems like internally the plastic is painted) and clear bodied yellow (transparent yellow plastic) and this is the kind of led used in the original RM VV!
Hey bajaman thanks for your mod and i'll try to put it into my little VV!CIAO by KAPUTEPALLA!

thanks again for this reply alessandro - as i suspected they are clearbody standard yellow leds - not hibrite waterclear leds.

thanks
kt!

Post by **modman** » 20 Sep 2007, 13:07

I must have made a mistake moving the messages, but there were two threads, now with the layout and pcb available please discuss VoodooVibe here.

sorry everybody. I seem to be human after all..

KT66 · Post by **KT66** » 20 Sep 2007, 17:58

hey alessandro

can i ask you why you changed the speed range caps to tantallum? are they tants on the board? the pics i have dont show those caps becasue they are under a cable jack.

i cant find a 0.68 tant cap anywhere.. can i wire in two 0.33 tant caps in series? will tant caps work like that?

is there a reason i can't use greencaps instead of tants if i make the spacing a little further apart?

thanks
kt!

Bernardduur · Post by **Bernardduur** » 20 Sep 2007, 21:09

I think he used Tantalum caps for space as this caps were placed under a jack

I just used normal film caps and am very fond of my build; in a short while I need to A/B it with a friends original

Question; how would someone add a true stereo function on this pedal? I like it a lot but would love to use it in stereo with my (homebuild) Dumble and Trainwreck amps........ any ideas on this?

bajaman · Post by **bajaman** » 20 Sep 2007, 21:24

I used MKT film type caps too - no problems encountered - only sets timing on the ICL predision waveform generator chip - you could use anything here - tantalums are smallest physical size for these values though.
bajaman

alessandro · Post by **alessandro** » 21 Sep 2007, 00:10

Tantalum are in the original,i used film caps too!

greenskull · Post by **greenskull** » 21 Sep 2007, 01:50

Thanks KT66, I will try those vactrols when I build. I may also grab some LDR's just in case.
I wonder if the color of the LED really matters as much as the LDR ratings?
I'm going to have to order from 4 different places to get all the parts I need to build this (including powdercoated case). It may be a while before I get started.

Futurlec has the ICL8038 chip for $16.00 and rotary switches for $1.00 a piece. Oh yeah, they have the Alpha pots for 50 cents each. They sell BC549, but don't mention the suffix... will get those from Mouser. Allied Electronics has the vactrol that was recommended by KT66 for $3.00 each... also noticed they sell gallon jugs of ferric chloride, which is great because my local Radio Shack stores don't carry it anymore. Will get the enclosure from Pedal parts plus.

bajaman · Post by **bajaman** » 21 Sep 2007, 02:19

Hi folks
Here is the graphic I used for my build in an NSC1790 case (smallbear or pedal parts plus)
If you want the hi res artwork just PM me
cheers
bajaman
Baja Voodoo Vibe front panel label

jt · Post by jt » 21 Sep 2007, 05:50

Nice layout bajaman

KT66 · Post by **KT66** » 21 Sep 2007, 06:00

greenskull wrote: I wonder if the color of the LED really matters as much as the LDR ratings?

yeah it does matter which colour the led is. ldr's react differently to different wavelengths (colours). most ldr's are most sensitive to the yellow wavelength.

red is very close to yellow in the wavelength spectrum so it doesnt make much difference if you use red leds, yellow is better though so that is why RM used yellow i presume. that is why i always use yellow anyway

kt!

KT66 · Post by **KT66** » 21 Sep 2007, 06:04

just a thought for those who are going to build this one - i am adding an additional led on to the led block in the pcb so you can see how the wavform is moving on the outside of the stompbox - i will upload soon, so those that want it, wait for me to upload

i am also making a couple of extra mods to suit a varierty of types of parts.

kt!

mz77 · Post by **mz77** » 30 Sep 2007, 22:32

greenskull wrote:Thanks KT66, I will try those vactrols when I build. I may also grab some LDR's just in case.
I wonder if the color of the LED really matters as much as the LDR ratings?
I'm going to have to order from 4 different places to get all the parts I need to build this (including powdercoated case). It may be a while before I get started.

Futurlec has the ICL8038 chip for $16.00 and rotary switches for $1.00 a piece. Oh yeah, they have the Alpha pots for 50 cents each. They sell BC549, but don't mention the suffix... will get those from Mouser. Allied Electronics has the vactrol that was recommended by KT66 for $3.00 each... also noticed they sell gallon jugs of ferric chloride, which is great because my local Radio Shack stores don't carry it anymore. Will get the enclosure from Pedal parts plus.

I hate Futurlec and their ridiculously slow shipping. I hate them so much that I spent an hour searching the web to find somewhere else to buy the parts.

Anyway, http://www.bgmicro.com/ has the ICL8038 for $3.95. They also have the BC549C and BC559C chips, as well as 300k/1M LDRs and clear (painted/translucent) yellow 5mm LEDs.

And it looks like they ship internationally.

KT66 · Post by **KT66** » 01 Oct 2007, 07:46

mz77 wrote: I hate Futurlec and their ridiculously slow shipping. I hate them so much that I spent an hour searching the web to find somewhere else to buy the parts.

i have built my voodoovibe clone with changes made to the pcb that i saw fit.

i am awaiting parts from, you guessed it, Futurlec. when my build is verified i will post the layout i used.

kt!

Little VOODOO VIBE project by Kaputepalla [documentation]