Sealing stuff

[Colas LeGrippa]

Hi boys and gals


What is the best and cheapest imposdible to remove stuff to seal a circuit ? I just don t want my client to copy it. Epoxy is expensive, silicone is easy to remove....construction glue ?
What do you guys use ?

[mresistor]

Put it in a safe.


Conformal coating.      https://www.chemtronics.com/the-ultimate-guide-to-conformal-coating
 

[acheld]

Well good luck with keeping your design private . . .

Dumble (reportedly) sanded off the values of components before covering them with the goop.  At least some of the circuits were covered in my favorite stuff -- Permatex.

[brewdude]

Not that I would recommend it…
But, I saw something on YouTube where someone had spray painted the entire circuit board to hide their secret formula—what a mess. 

[Colas LeGrippa]

I can't use mine, I  forgot the combination number right after my wife walked into it.
Wouldn' t you have another solution ? Like concrete ,  a bomb attached to a cover screw,
a police siren .....try  to imagine something more
cheap than a safe and harder than bull shit...
Non conductive melted lead, melted glass, a notice to users saying it is forbidden to open it up, gee there are many that you haven t thought of.  I ll wait for more...practical suggestions if it doesn't hurt your ego....

[shooter]

use nature, brew up some alcohol, dissolve a whole bunch of that Canadien  pine tar in the alcohol, run it through an old sock or coffee filter, then pour in, let set.


1st test for conductivity on an 80's boom-box 

[acheld]

How about a couple of "High Voltage -- Danger" signs plastered over the back, and then covering the access screws with tamper-resistant paint, and include the statement:  "Warranty is voided by entry." 

And if I could find one of those miniature paint bombs that spray indelible ink on a thief, that would be cute.

Or, don't sell to folks you think are going to rip you off.   That rules out a good chunk of mankind, however.

Better to drink the Canadian Whisky than use it as a solvent anyway

Honestly, it's impossible to keep the secrets of an amp sacred . . . 

[mresistor]

Colas did you look at my second suggestion?

[Colas LeGrippa]

Acheld, you re giving me an idea. Permatex sells liquid gasket that is so hard to remove that I had to use a grinder to get rid of it on my motorbike primary gear cover....I think I will get me epoxy, only to hide the tube socket and components attached to it. It is not a whole amplifier, only a small stompbox, so only the 2 tubes  will do the job. I used silicon only once. When they returned the unit to me for repair, a large part of silicone had disapeared......


 

[Colas LeGrippa]

M resistor, yes I did read your link I thank you.
I think the cheapest way to cover the main circuit is to drown it in epoxy. I know I wont be able to fix it that s for sure but in general they are much reliable circuits.

[uki]

Just put a radioactive and hazard symbols in the box and warning for sure death with lots of pain if box is opened !! People usually believe everything.

[Colas LeGrippa]

Haha that is good, radioactive material warning !!!

[sluckey]

Colas, just send your magic circuit to me. I'll fix it so no one can tell what it is. I promise not to rip your design!   

The number to call is BR-549

[Colas LeGrippa]

Sorry I just can't make you explode with it what are we gonna do without you here ?