Fulltone OCD v3 questions

[El_Diablo572]

Thanks lads, assuming i get my jacks in the post today i should be able to fire her up later!

[El_Diablo572]

Well, i finished, tried it out but it didnt work, i get sound while in bypass but nothing when i press the switch. I have no idea what i did wrong, probably something with the wiring of the switch

EDIT: with the two position switch, the plan says i take one wire to the switch and volume 3 and  a seperate  wire comes back from the switch. Do i put the switch BEFORE the volume pot or after it?

Also, using lvlark's offboard wiring diagram, do i connect the 9v from the board direct to 9v or should i be connecting this elsewhere?

[Marbles]

Sounds like it. Or power.
 Does your light turn on when switching? Or doesn't that either?

Possible to take a pic of the switch wiring?

[Marbles]

It doesn't really matter. That wire has to be connected to both. So if you let that wire go to volume 3 and from there it goes to the switch it's fine (that way it goes to the volume lug, but also is basically 1 long wire to the switch if that maakes sense).

The 9v should just be connected from your power input to the board, nothing in between it.

Did you check if you connected the right power lug from the 3?

[Travis]

For the shared connection at Volume 3 and the toggle switch lug, you need two wires. One wire connects between the board and either Volume 3 or the toggle switch lug, it doesn't matter which, you usually just pick the one that's closer to the board for convinience. Then with the second wire, connect the toggle switch lug to Volume 3.

Are your cuts on the solder side of the board good? Be careful at this stage because you didn't socket the IC or mosfets and you will make it a lot harder to repair if you fry those

Best thing you can do right now is post clear photos of the front and back sides of your board and your wiring. It would be best not to power it up again until someone checks it out

[El_Diablo572]

...connect the second switch wire to volume 3? Based on the plan i thought it went from the board to volume3, then to the switch, and then back to the board...?

[Marbles]

Yes...
Well, depends what you mean by 'back to the board' . If you mean back from switch 1b after then no.

The wire that is marked 1b and volume goes to vol 3 en from there to switch 1b. That's where it ends for that wire. It's done.

There's only one another wire from the switch, and that's the one between 1a and the board marked 1a.

[Travis]

As long as volume 3 and one of the toggle switch lugs are connected together, and that junction connects to the board in the proper location then it is correct. There will be 2 wires. One wire from the board to either volume 3 or toggle switch lug, one wire linking volume 3 and toggle switch lug together. Nothing more or less

[El_Diablo572]

Like so? This appears to be right, i'm wondering if i've done something wrong with the stomp switch

[Marbles]

Yes, that's correct.

Don't take this the wrong way, but I see you used vero for the pot:

Are you sure that the vero strips are in the right direction, and not going from lug 1 to 2 to3? (just double checking).

If not, this looks good to me.

Can you post the switch?

[El_Diablo572]

Haha, no, the vero is correct, had the same thought myself!

I'll try to get a decent photo of the switch and wiring later on when i'm back at my desk. I'm pretty sure this is where my problem lies, possibly where i've connected the switch circuit to the board itself, i thought i had it figured out but i'm a little confused as to where my input and output should be connected now....

[Marbles]

Proabably. Though your drawing looks good.

I always had this one (which is basically the same):




This is the same as your drwaing though if I'm not mistaken.


Does your LED work?

[El_Diablo572]

Well, i need a change of underwear....

Tried her again, dont know what went wrong the last time, but it works now.... I have a marshall avt50. volume and gain were maxed, i nearly blew my window out when i switched her on!!!!!

[Marbles]

Hahaha, yeah, love when that happens.. :)
A few more of those and you'll learn to turn them down before every test haha.

Congrats!

[El_Diablo572]

The headroom is astounding. The amp volume was only set at 1-1.5 (not even enough to saturate the preamp tube, usually it only wakes up when you push it past 3....)

Good sound, not too bassy or harsh like people say, to be honest i'd like a little more gain for heavy palm mute stuff, but i get the feeling the pedal and amp react with one another depending on your settings. Dont think too much of the switch settings though, the LP setting just seems to take the bite away and muddy the tone a little, meaning i'll probably just leave it in HP and not touch it again, but i haven't really played with it much yet at this stage.

[El_Diablo572]

Okay, so, this was working fine, now i have a whistle coming through when my guitar's volume is down, and i think this is screwing with the whole sound the pedal produces.

any ideas?

[El_Diablo572]

Bump....

Anybody got any ideas on this one? A friend seems to think whistles are usually to do with bad capacitors, could he be onto something?

[Marbles]

This is the part where I usually leave it up to the pros, sorry..

There are a few other people who have had this. If you go tho the layout page of the OCD, i would suggest doing a CTRL+F (or CMND+F) and look for 'squeal' or 'oscillation'.

Some have fixed it with upping the 51p, others with a diode replacement or something. Maybe worth a shot?

[Frank_NH]

Re: Squealing.   I had this happen to my OCD build.  Changing my Op Amp to a TL082 from a TL072 seemed to fix it, as did placing a buffer in front.

[El_Diablo572]

Maybe i'll give that a go. How would i go about putting a buffer in there?