I built the double D and wired it up to the specs of the perf layout and for some reason both channels come on at the same time. I also wasn't sure how to wire the GAIN pots in so I placed them between the switch and the appropriate caps. Neither GAIN pot works either.

The tone that I get from whichever channel is working has a FUZZ tone to it. Is it supposed to be like that or is it supposed to be a hard rock distortion??  I don't consider FUZZ hard rck( VH, Satriani etc.)

Thanks
Mike N.

have you got the schem

It's at runoffgroove.com but I do have a copy of it tho.
 I'm not sure what I did wrong. I thought I had it wired up like the schematic says to.

Thanks a lot~!!

Mike N.

I would suspect a wiring error in the Gain pots and/or channel switch.

Do both Gain pots have an effect on the sound of the channel that you are able to hear?

good  morning, I just built that circuit and the wiring had me a little confused at first. The perf doesnt show the gain pot wired in but the schematic is fairly clear.I had to do a double take between the schem and perf....This is how I wired mine up.You come out of the .047into the spec. location[swtch 1a] ...[ center point on dpdt pic, this is your common and the switch will throw it to one or another]on the perf look at the switch, take the top to lug 3 of gain pot jiggle side and take the bottom of the switch to the 3 lug on gain pot for the bounce. Come out of the wiper[ lug 2 on each gain pot back to the in of the spec. circuit and ground the lugs. If you use a dual 100k pot for the gain and for the out vol........So the it goes out of buffer cap[.047 to swtch./ from swtch to gain lug 3 / out wiper lug 2 / to the circuits. Once you have that the out vol. is fairly obvious. Side note I used an 3819 for in buffer [watch the pin out] and mpf 102 for out buffer and there was absolutley no loss of vol. You can save your j-201 for a meteor build. I have also added a tone stack etc. I will be posting pics and some intering side notes pertaing to some addon features you can try with this circuit. This circuit works fine. Oh yes I added an 10k trim to adjust bias on the in buffer [where the plus voltage goes in.

I just boxed my DoubleD yesterday, had to add a pulldown res (1M) in the output, cos it poped when switched.

Other than that, it worked fine when i managed to take out all the mistakes i put in

I used pcb, with my own layout, (took me 5 versions and 1 failed etch, but i nailed it!! (ups, why the input is conected to the fet source? arggh!!). Well, nothing a jumper cable and some trace-cutting won't fix

I tried changing the output cap to 0.1, the high gain sounded real mean, but a little over the top with treble, the low gain was downright too harsh. I may try a 0.33 to reduce a little bit more treble, but that's gonna have to wait, i really like it the way it is.

I had to wire the switch to ground the input, too. Maybe my wiring has something to do with it

Used mpf102 for input and output buffer, no problems there. Biasing whith the trimpot was simple, and the difference is tremendous. Tried at 6, 5.5, 5, and 4.5v. I left it at 4.5v, but you be the judge of that.

Good luck!!

Here it is: from top to bottom on the left side of the switch: vol wiper, .22 cap, vol wiper
right side top to bottom:gain lug 3, .047 cap. gain lug3

what do I need to change??

do the J201's have too much high end?? why is everyone using the mpf102's??

Thanks
Mike N.

Your switch wiring looks good to me, that's how i did it.

I used mpf102s just because i can't get any j201s, i could try other jfets to see what happens (bf245,2n5457, thanks again Arn ).

You could use an audio probe, to see what's going on, if you can't fix it after the N-th check

Radio Shack sells mpf102's.

Anyone?? I still can't figure this thing out.

Thanks
Mike N.

Do both Gain pots have an effect on the sound of the working channel?

They do now. I changed the wiring on the switch a little. I swapped one gain pot with one volume pot conection on the switch. Now both gain pots work on the one channel and only one volume pot works now.
Getting closer  :lol:

Oh, and now I'm getting a radio station when I turn up the volume pot that doesn't work.
I don't know if that will help or not.

I suggest you re-wire the switch from scratch.  Due to the issues you're reporting, there seems to be more than one error.

When correctly wired, each channel operates independently of the other.  There should be no interaction.

Ok, this is what started all of the problems. How do I wire the switch??

Where do I wire the gain pots and the volume etc. etc.

 For my sake go from top right to bottom and top left to bottom.

Thanks for all the help.

Mike N.

Ok, this is what started all of the problems. How do I wire the switch??

Where do I wire the gain pots and the volume etc. etc.

 For my sake go from top right to bottom and top left to bottom.

Thanks for all the help.

Mike N.

The left side switch diagram on the perf layout is incorrect.  A corrected version has been posted.  I apologize for the trouble it has created for you.

Here's the correct switch layout.

Left side, top: Jiggle Gain lug 3

Left side, middle: .047 output cap of input stage

Left side, bottom: Bounce Gain lug 3

Right side, top: Jiggle Volume lug 2

Right side, middle: input cap of output buffer

Right side, bottom: Bounce Volume lug 2

OK, one side works so I'm sure I have something screwed up. The other side barely gets any volume. The side that does work is sooooo hot that it feeds back like crazy. It sounds good untill I stop playing. Is the effect supposed to be that hot??  I think I have both sides through one because it is ultra high gain.
Is it supposed to have a little fuzz to it or is it supposed to be more like a tube screamer??

My meter is dead so I can't check anything and that really pisses me off because I have to keep asking questions instead of figuring it out. I am looking forward to getting this pedal working so badly I can't stand it.


 Mr. Tremblay, thank you for all of your help so far~!!!
It is very much appreciated~!!!

Mike N.

It's possible that a wiring error resulted in the Jiggle driving the Bounce channel, which would result in a very high gain sound.  If that is the case, the other channel could be just the JFET input stage?

Try removing the channel switch from the equation.  Connect the output of the JFET gain stage to one channel's Gain pot and connect the lug 2 of same channel's volume pot to the output buffer.

Then, if that channel seems to be working properly, do the same with the other channel.

Let me ask you this. Should my gain pot have lug 2 wired to the .022 cap?? and the other gain pot lug 2 to one .047 cap???

 Where exactl;y do I need to connect the gain pot and which lug needs to be connected where?? Where is the Jfet output and whcih cap is the output buffer??
Yes, thats right, I;'m a dumbass. thats why I can't get it working~!!

Thanks
Mike