| Electronics > Projects, Designs, and Technical Stuff |
| Yet another resistance decade box |
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| linux-works:
how are the switches going to be mounted? I don't have mine yet (on the way in the mail) but its not obvious how they securely mount. is there a rod that would go thru them all, side to side? I think I've seen TW switches with holes like that before. the neat thing about lasercut boxes is that you can make them custom to-size, and since there is probably a square corner style hole to be cut, that's not something I would want to do at home with hand tools, for example. round holes, sure, I won't invoke a laser for that. this isn't round holes and so I'd hate to have to machine a pre-made box; might as well just blast the whole thing out on a laser and have it be exactly what you want. |
| bitseeker:
That laser-cut box looks good. I like the way the top and bottom panels overhang with the tabs inset. I suppose there could be a group buy on such an enclosure as well. Thanks for the link to the box designer. |
| linux-works:
if enough people like a design, I could run off a small bunch of them during some scheduled time at my hackerspace. the design would be in .pdf format so any art tool should be able to import it and edit it for re-print (re-burn?) I'm still wondering HOW this is going to mount!? before boards are sent out (have they been?) - has thought been given to how to mount this, remove sections for fixing or update or replacement and so on? would it make sense to have the pcb's terminate in a finger backplane (think: pci cards and slots, etc) or something, that would help the whole thing mount? maybe a backplane board with sockets and the rotary switches would plug into that? if these become 'plugins', then some plastic box around that could be made to guide the modules into a backplane. what do you guys think? at any rate, there has to be some thought as to how these get mounted ;) |
| bitseeker:
Very good points. I haven't thought about it. However, I'm awaiting arrival of an IET decade box and will see what they did. Based on the service manual, they only use five resistors per decade (e.g., for 1 - 9 Ohm decade: 1 x 1 Ohm, 4 x 2 Ohm), having the thumb wheel route current through the appropriate combinations. I kind of like the enclosure of the RBOX Mini. It's very much in the spirit of the method you described, but with the standoffs on the outside. Using a two-layer, white and black, acrylic would make for nice etched lettering, but I suppose you'd also see the layers along the cut edge of the panel. |
| PeterZ:
Normally, if you buy these switches from any large supplier, like Digikey or Mouser, at a different prices of course, they come with two ending caps having a snap in function (see the pic). No idea if you can get them for KM2 switches. I used a high quality hot snot in my box ;) Wouldn't adding more finger type springy contacts significantly increase the overall residue resistance? |
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