| Electronics > Projects, Designs, and Technical Stuff |
| Yet another resistance decade box |
| << < (60/87) > >> |
| gblades:
--- Quote from: ez24 on August 03, 2016, 10:58:56 pm ---I got a sample of the "big" switch and I like it. It is easier for me to use. I thought maybe I could wire up external caps and make a cap decade box BUT it is a BCD switch. I never saw one of these. I assume you need TTL logic to make it work, but I wonder if some sort of decade box could be made with it without TTL or MCU? Maybe I should start a topic on it. Does anyone have any ideas? thanks --- End quote --- I would have thought BCD might actually be better for a capacitor box due to the way you stack capacitors in parallel to combine the capacitance. With a digital output you would need 1 of 1nf all the way through to 9nf. With a BCD output though you only need a 8nf, 4nf, 2nf and 1nf. The 1,2 and 4nf you can make up by stacking capacitors side by side or on top of each other of there is enough room. The 8nf then is a bit more awkward as 8 caps are a bit too many to stack but even so it does make it simpler and reduces the number of different value capacitors you need to purchase. |
| Fortran:
Here's my box :) They're both supposed to be short, but I broke my last M2 tap on the first hole :palm: Can't screw it together until I get a new one so I'm using an uncut box until then. |
| Back2Volts:
Fortran, nice! What are the dimensions of the box, 60x55x25 ? Is the body just one tube piece? How do you cut it? I was thinking about running an aluminum box through my 10" table saw, but it kind of scares me :-// |
| Iwanushka:
--- Quote from: Fortran on August 04, 2016, 02:21:13 pm ---Here's my box :) They're both supposed to be short, but I broke my last M2 tap on the first hole :palm: Can't screw it together until I get a new one so I'm using an uncut box until then. --- End quote --- Nice boxes, do you mind sharing a link to them? |
| Fortran:
It's 80x50x20 http://www.ebay.com/itm/172255252886 But I cut it down to 60x50x20 with a metal band saw. Mine looks like this: But a regular vertical one would work too. Just screw it together first so the pieces are aligned, and cut slow and carefully. The endplates where cut with my CNC mill, because I'm too lazy to do it manually :) |
| Navigation |
| Message Index |
| Next page |
| Previous page |