Fulltone OCD

Lurco · March 07, 2005, 01:59:47 PM

http://forum.musikding.de/attachements/ocd_open.JPG
goop goop goop gooparabagal!

cd · March 07, 2005, 03:01:26 PM

A dental pick and some patience will have that goop off in no time.

stm · March 07, 2005, 03:24:49 PM

Seems there are a few components and a single/dual opamp only!

casey · March 07, 2005, 03:40:47 PM

how does a fella get a hold of some of that nifty goop?

stm · March 07, 2005, 03:52:26 PM

I think we need to add a new entry to the DIY dictionary:

Goop = Anti-DIY stuff

Torchy · March 07, 2005, 04:14:30 PM

crp

Outlaws · March 07, 2005, 04:16:57 PM

Quote from: TorchyShouldnt that be

Goop = Anti theft device ... :?

Or...

Goop = Anti-Theft discovery device. :roll:

I guess it could go either way by the sound of it huh? :wink:

puretube · March 07, 2005, 04:56:38 PM

seems to be some non-conductive stuff, doesn`t it... :?:

Torchy · March 08, 2005, 06:30:58 AM

crp

casey · March 08, 2005, 09:36:59 AM

Quote from: puretubeseems to be some non-conductive stuff, doesn`t it... :?:

yeah, and where can i find some? i would like to use it for some of my pedals....

cd · March 08, 2005, 12:17:35 PM

Any hardware store, just buy the 5 minute epoxy.

casey · March 08, 2005, 12:36:50 PM

Quote from: cdAny hardware store, just buy the 5 minute epoxy.

i wont hurt any of the components?

Satch12879 · March 08, 2005, 12:51:07 PM

It's called potting epoxy. MG Chemicals makes a few different types (also copper-clad boards, pre-sensitized boards, developer, etchant, accessories, etc.) that are available from Mouser. I just bought a 375mL set of clear potting epoxy that I plan on using but they also make a black and a blue some of which are thermally conductive.

stm · March 08, 2005, 01:15:08 PM

Be aware that use of potting may preclude fixing the PCB should it ever fail due to a damaged component or cold solder joint. This is particularly true when you need to repair a board for someone who paid for it.

In my case, I prefer erasing markings on caps, ICs and transistors as a copy protection method. A lot of work needs to be done to reverse engineer it anyway, and there will always be uncertainty as of the semiconductors in use.

Of course goop has an "instant mojo" effect, such as: "if they took the time and effort to cover it, this must be really good and worth protecting!" :twisted:

Regards,

STM

cd · March 08, 2005, 01:39:25 PM

Quote from: casey
Quote from: cdAny hardware store, just buy the 5 minute epoxy.

i wont hurt any of the components?

nah, it's plastic.

petemoore · March 08, 2005, 02:31:55 PM

Of course goop has an "instant mojo" effect, such as: "if they took the time and effort to cover it, this must be really good and worth protecting!"
I add: and the only way I can ever have 'that' exactly is under the goop.

stm · March 08, 2005, 02:39:58 PM

Pete, I don't know if you are saying it as a joke or with a part of seriousness, but in fact the dielectric constant of the goop after it is dry could eventually take part in the overall effect, by means of increasing the pin-to-pin parasitic capacitances.

In case of a FF, this could effectively increase the Base-Collector capacitance, thus softening the sound. The same can happen between the negative input and output pins of an opamp.

As such, different goop materials *eventually* could alter the tone. I have the feeling that this may be subtle, but noticeable on high gain pedals where high-valued resistors are involved.

Regards,

STM

petemoore · March 08, 2005, 02:48:44 PM

Well if it's gooped, an owner of a circuit has to think the technology inside can only be bought, and if all such circuits are gooped, that's the only way to have 'that'.
Now, new question is about parasitic capacitences of goop, whether that's a joke or whether your perception is that the 'softening' or other circuit function goop may induce is 'good' or bad' or a little of both or...makes sense that it would 'change' the circuit to some degree, I notice these gainy circuits are pretty sensative as to what they are near when they are on...especially say my hand, many circuits 'change' considerably when a body gets within a certain proximity of it, goop would be like on it...interesting stuff, I'd never really thought about that.

Peter Snowberg · March 08, 2005, 03:22:04 PM

I think it should be pointed out that the goop is generally one of two major epoxy systems, as are FR4 circuit board binder, many capacitor, inductor, and resistor shells, and most transistor/chip packaging.

It's fairly inert stuff, but nothing is totally inert. So now how many pF get added to test circuit/layout X, once you cover it? Anybody have a lab-quality cap meter?

I would love to know.

Maybe I'll start marketing a brand of boutique effects encapsulents with different dielectric constants. I can see it now...... "HarshAwayâ,,¢" brand Goop. Available with dielectric constants from modern to vintage.

Here's some reading....
http://fame.sdsu.edu/student_research_dialectic.html

Notice the Hotel California-like architecture in the background. :mrgreen:

wampcat1 · March 09, 2005, 02:02:19 PM

Quote from: stmMaybe the OCD is just a kind of RAT clone, as the Full-drive is a TS clone. Just guessing here. Can you point to where the picture of the unit is? Are there any visible TO-92 trannies/JFETs besides the OpAmp?

Actually, I believe his other distortion pedal is a variation of the rat, if I'm not mistaken...

News:

Fulltone OCD