PCB mounting techniques?

[schnarf]

I'm putting together a Ross Comp clone and a AMZ Mosfet booster inside one 1790S enclosure. I feel like putting a piece of foam on the bottom to insulate the pcbs from the enclosure and leaving it at that would be bad; I don't want stuff flopping around. How do people here hold PCBs in place?

[foxfire]

you can get plastic and metal standoffs at small bear and the like. http://www.smallbearelec.com/Detail.bok?no=76

[markm]

I use plastic or metal standoffs and JB-Weld them into place.
(man, I've gotten alot of mileage out of this pic huh?) 

[hellwood]

I'm putting together a Ross Comp clone and a AMZ Mosfet booster inside one 1790S enclosure. I feel like putting a piece of foam on the bottom to insulate the pcbs from the enclosure and leaving it at that would be bad; I don't want stuff flopping around. How do people here hold PCBs in place?

funny you say this. i just did that today and made perfect cutouts in the foam for the battery and the circuit board and stuffed them tight into place. you could shake the hell out of it and everything stays where it belongs. also, there is no shock transferred to the electronics when you kick at it or drop it!

[GibsonGM]

Both good ideas!
+1 for the JB Weld, mount the standoffs to your board, JB the ends, set it in the box...do this so the posts line up!  If you don't really torque the screws, the board is then removable later for tweeking. 

I like the foam idea, gonna try that!   
PS - I always line the bottom of my enclosure with cardboard/paper, so if the PCB falls off it won't short out  ;o)  You never know at a gig....

[Pushtone]

Nylon bolts and nuts. Not the cheapest method but has some advantages.
Fully adjustable height allows you to hover the PCB over other parts, like pots.
Easy to remove PCB, no glue or screws. Held in place with compression between box and lid.




There are more ways. Do a search for keyword "standoffs"


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[ubersam]

I use plastic or metal standoffs and JB-Weld them into place.
(man, I've gotten alot of mileage out of this pic huh?) 

http://aronnelson.com/gallery/albums/album24/FXb.jpg

I have been doing that as since seeing that pic. I just use plain white nylon stand-offs instead of the ones with the threaded brass inserts.

[Alex C]

Nice pic, Pushtone; I've used those nylon parts before, and I love not having to worry about shorting to the case.
Here's another thread with some of this info repeated, but a few other methods:
http://www.diystompboxes.com/smfforum/index.php?topic=46056.0

[gaussmarkov]

fwiw, when i can, i don't use any standoffs.  smaller circuits can be stood on their sides. the sides of the enclosure and the wires keep the pcb from moving.  for this method, i cut the board so that its edges come close to the sides of the enclosure.

[Barcode80]

i've tried using jb quick to mount brass standoffs, but i can't get as impervious a bond as i think should be possible with jb quick. so, when mounting in a 1290 enclosure, i've begun making the board a bit big, then shaving down the sides until they wedge nicely between the walls of the enclosure.

[Processaurus]

You can also solder some heavy solid copper wire to a ground bus and make a couple roll bar like loops that keeps the board wedged between the ceiling of the box and the lid.

[markm]

i've tried using jb quick to mount brass standoffs, but i can't get as impervious a bond as i think should be possible with jb quick.

Try sanding the area inside the enclosure where the standoff will be adhered and it will stick much better.
Sometimes the oxidation is enough to keep the JB from bonding as well as it should.