Nice work Brian. Using a pre-molded cable should help with fitting into the M100 slot.
Kurt On Wed, Jul 10, 2019, at 11:28 PM, Brian K. White wrote: > I finally did the version of this that I had envisioned. > https://oshpark.com/shared_projects/Sk27mJwq > > The idea here is you just buy a cheap modem cable for $2 and cut off the > 9-pin. No dupont crimping, no backshell assembly, least possible strain > from stuff hanging off the 2x4 header in the tpdd. The tpdd-end only > needs heat-shrink and maybe some hot-glue. I think I actually prefer > that to making the pcb any larger to make a dedicated place for > strain-relief. > > One thing not in the pics yet is, to get a polarity bump, I'll try > replacing the 2x4 header with a 2x3 standing on two in the middle, > flanked by two 1x2's. Should work fine and be less finnicky than trying > to glue something onto the top of the 2x4. > > -- > bkw > > > On 6/1/19 8:47 PM, Fugu ME100 wrote: > > I went for a slightly different solution and made a level shifter > > board that fits into the TPDD 8x2 plug on one end with a DB25 towards > > the Model T, then used an off the shelf straight through serial cable > > to connect the TPDD to the Model T. Works really well no need to > > crimp anything just all very straightforward soldering :) > > > > Did need to ‘extend’ the board a little to get the connector to fit > > properly into the TPDD. I used an edge solder approach as you can see > > (Hope the image is OK to attach?) I didn’t bother with a enclosure > > the board is really tiny, although thought about using shrink tubing. > > It could of been a DB9 but I had a lot of DB25s to use up :) > > > > > > > > From: M100 <m100-boun...@lists.bitchin100.com > > <mailto:m100-boun...@lists.bitchin100.com>> on behalf of Brian White > > <bw.al...@gmail.com <mailto:bw.al...@gmail.com>> > > Reply-To: <m...@bitchin100.com <mailto:m...@bitchin100.com>> > > Date: Saturday, June 1, 2019 at 5:14 PM > > To: <m...@bitchin100.com <mailto:m...@bitchin100.com>> > > Subject: Re: [M100] dsub 25 hood that fits > > <snip> > > > > Another idea is make a different pcb which goes on the tpdd end > > instead of the m100 end. A crimp-on 2x4 idc (he said, redundantly, > > given what idc stands for) plug does not fit in the hole in a > > tpdd, but maybe a female 2x4 pcb header does. If you could just > > extend a female pcb header to stick up off a pcb surface just a > > little more, then you could have a small pcb that sits flat > > against the back of the tpdd, and has a plug that sticks in to the > > tpdd. That would eliminate the *excruciating* process of crimping > > individual tiny dupont connector pins I'm using right now. Then > > just cut the db9 off a common modem cable and solder that to the > > pcb, and you have a full cable that was much easier to build, and > > which fits in a M100. (Rick's original cables were easy enough for > > him to build only because he used FB100 cables to provide the tpdd > > plugs. I'm going for more available parts.) Only remaining problem > > there is some sort of enclosure for the pcb. Maybe the 2x4 header > > can be a right-angle type, and so the pcb sticks out 90 degrees > > from the tpdd in line with the cable. Then, assuming the whole pcb > > is small so it doesn't stick out too far, and give it a little > > dog-bone shape, you could zip-tie the serial cable to it and > > enclose the whole thing in simple heat shrink. I don't know if you > > can get a right-angle header to stick out far enough from the side > > of a pcb to allow it to reach in to the pins in the tpdd though. > > And I don't think there's enough room for the pcb to extend inside > > the hole either. > > > > > > <snip> > >
