DIEFET: A French Diezel VH4 Jfet Simulation

[Ripthorn]

I made the V1.2 mods on a V1.1 board, you can put the cap on the gain pot itself and then the other values are just changes to the values (no new locations, really) and make sure that the deep pot only has the two lugs wired.  Takes about 5 minutes.

[kupervaser]

Thanx,

Is there anyone who can tell me whether i can fit this pedal into a BB enclosure with battery?

[ech0es]

battery means 9v, the diefet will sound much better with higher voltage

[kupervaser]

hey Echoes, what is the right voltage for it? 12 or 18?

Could you send me some pics of the guts of this pedal? Can i fit it in the BB enclosure?

THanx
Jeff

[ollie]

battery means 9v, the diefet will sound much better with higher voltage

But I could run it from 9V DC Adaptor and add a voltage doubler like this one: http://www.elecfree.com/electronic/voltage-doubler-with-ic-555/

Says it has low output current so stick a tranny follower on the end maybe? 18V should make it sound pretty good I would've thought

[Ripthorn]

I run mine off of 12V and as far as box size, I would think it would fit in a BB, though the box mine is in is one I made (inner dimensions of approximately 4.5"x3.5").

[kupervaser]

Thanxa a lot everyone. I think  could build a voltage doubler.

[ech0es]

my diefet has a voltage doubler in it with a max1044

[kupervaser]

Hey Echoes, can you send me some pictures with the insides of your pedal? I want to see how to fit it in the enclosure:
please email: angar666@hotmail.com
Thanx
Jeff

[ech0es]

i can't take pictures, but the pcb AND a battery fits very well in a BB enclosure,(and with a voltage doubler!)

[kupervaser]

In your first post it sais:
Dimensions : 135 x 44 mm

The BB enclosure dimensionds are:
119x93,5x34mm

Are you using a different layout? Because this lay out won't fit.
If you are using a different layout, could you post a link here?

Thanx in advance,
Jeff

[ech0es]

i used a breadboard.

[ollie]

I got my PCB through 

Looks nice and shiny 

Unfortunately I don't have a clue where to put anything; thus follows several evening of research...

[DSV]

Here are all the files:
http://www.techniguitare.com/projets/DieFet/

In paticular:
V1.11
http://www.techniguitare.com/projets/DieFet/PCB-DieFet-Implantation-V1-11.jpg
http://www.techniguitare.com/projets/DieFet/DIEFET-V1-11.pdf

V1.21
http://www.techniguitare.com/projets/DieFet/Notice-DieFET-V1-21.pdf

The topic is here:
http://www.techniguitare.com/forum/viewtopic.php?t=7386&start=0

[kupervaser]

Thanx, i am starting to build this thing. Probably going to make the enclosure myself.

[kupervaser]

Thanx for those links, however:

In your first post it sais:
Dimensions : 135 x 44 mm

The BB enclosure dimensionds are:
119x93,5x34mm

Apparently this layout won;t fit in the BB enclosure. Can someone show me a layout which can fit in the BB enclosure if someone has built it that way?

Thanx a lot

[Ripthorn]

One of the other members has a smaller layout, you could PM him.  I don't remember his username off the top of my head, but I think it is gkoersman.

[kupervaser]

THanx

I have another qustion. How should i adjust the trimpots concidering i am using a voltage multiplier from 9 to 18 vots?

[Ripthorn]

Bias the jfets to 1/2 supply voltage.

[kupervaser]

Hello everyone,

I assambled the pcb yesterday and tested it. However all I get is oscillations.
I measured the voltages and it seems to be all good. I also checked the whole pcb with the schematic and the values are correct and it seems i haven;t made any mistakes during soldering.

This layout has been used:


This schematic has been used:


I checked with hte audioprobe and the oscillations start just after C11, the side which goes to the treble potmeter. I can hear good aplified and high gain sound on the source of the Q5.
The controlls don't do much. Volume works well, gain is very low. When i put the deep potmeter on 0 I have low gain sound, when I turn the Deep up I get oscillations almost immidiately. The sound I hear is similar to the Fuzz Factory.

I don't know where to look any more, I checked the pcb very thoroughly.

I used a voltage doubler, which gives me around 17,66 volts on the output. I adjusted the trimpots so the transistor recieves the half of the voltage. But the trimpots don;t really do much in my case at the moment.

Has anyone had this kind of a problem?

All the help is appriciated.