Perhaps I can make a custom-designed can through these steps: 1) Purchase tinned steel sheet from my local hobby supply as Dave recommended. 2) Create artwork & apply to the sheet. Just recently I saw a post pointing to a supplier of spray-on photo etch resist but for the life of me I can't find that one. 3) Etch the panel using the "piranha mix" etchant concoction discussed back in September '04. 4) Then make any final bends & solder the can to the board. Simple, right? I had planned on trying this approach to create solder stencil anyway. Anybody already tried that at home? An affordable spray-on etch resist seems to be the hardest thing in the world to find, however. Isn't a similar photo developing process used for everyday silkscreening? Rick ----- Original Message ----- From: "Kenneth Lumia" To: "Microcontroller discussion list - Public." Sent: Monday, January 31, 2005 1:47 PM Subject: Re: [EE] Another noise question > Note that these cans are available from www.leadertechinc.com > They have the advantage that the top of the can comes off from > the sides so that re-work is easy. The tops can either be solid > or with holes. They work quite well. Just make sure each pin > is tied to the ground plane. Try to get one with sides that > get as close to the PWB as possible. > > ken > klumia@adelphia.net > > ----- Original Message ----- > From: "Lawrence Lile" > To: > Sent: Monday, January 31, 2005 11:04 AM > Subject: RE: [EE] Another noise question > > >> Another simple trick you can try is a can. Take some very thin steel, >> with a nice solderable plating (there are several that work) and form up >> a little metal shield (a "can") that covers your board. You might have >> holes in it for adjustments and traces, the can could sit on three or >> four legs that contact ground pins on the board, and you can have some >> slotted thru-holes for attaching it. A can is not hard to fabricate with >> scissors and a whitney punch and a little hand forming, and is a breeze >> if you have a small press brake handy. It is also not expensive to tool >> up if you are doing a small production run. If it is too thick to cut >> with scissors then it is overkill, unless you are building an M-1 tank. >> >> >> Your can could be as simple as a sheet of thin ferrous metal, soldered on >> some copper posts, no folding required, or a sheet of steel on top of a >> paper insulator trapped under a ground screw at one corner. >> >> Put cans on both sides if you have room. >> >> McMaster-Carr (mcmaster.com) is a good place to find thin sheet stock of >> various types, and they will overnight it to you. >> >> >> >> You can do this, and yes, the pun is intended. >> >> --Lawrence Lile >> >> >> >> >>>From: "Rick Thompson" >>>Reply-To: "Microcontroller discussion list - Public." >>>To: "Microcontroller discussion list - Public." >>>Subject: [EE] Another noise question >>>Date: Fri, 28 Jan 2005 14:29:45 -0800 >>> >>>Here's a question for the noise experts: >>> >>>I've designed a 4-layer pcb running a 16LF876A at 4MHz to be used in a >>>VERY noisy environment. Fortunately there's no A/D functionality needed >>>but there's some timing-critical functions to be upheld (20Hz to 1000Hz >>>CCP events). Every trick that I could find to make the design immune to >>>EMI has been included or at least considered. But one consideration that >>>I don't know enough about is the need for a copper pour. Until now, my >>>understanding is that a copper pour can be considered as a "poor man's >>>ground plane" on 1 or 2-layer boards. But if my board already has a >>>ground plane, am I going to see any benefit by adding a copper pour on >>>any or every other layer, or am I just wasting my time thinking about it? >>> >>>Rick >>> >>> >>>-- >>>http://www.piclist.com PIC/SX FAQ & list archive >>>View/change your membership options at >>>http://mailman.mit.edu/mailman/listinfo/piclist >> >> _________________________________________________________________ >> Don't just search. Find. Check out the new MSN Search! >> http://search.msn.click-url.com/go/onm00200636ave/direct/01/ >> >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist