In an earlier post, i described how to connect Brain Vision Recorder, a Magventure TMS and Localite Software. In a later post, i describe how to solder the circuit. This would allow more flexible recordings according to your uniqe needs, e.g. multi-channel MEP mapping. As i am currently constructing another box for our second TMS-device, i took the chance and made some pictures to describe the process. While the earlier post was mostly theoretical, this post therefore now describes how to construct the box for communication.
What you need:
What you will need is a box large enough to host three BNC, a D-SUB 26 and a D-SUB 25. Watch out, as connectors come in many styles. The D-SUB connectors should be female and offer a solder layout. The BNC-connectors should be 50 Ohm, but i guess even 75 Ohm should not cause any large trouble. You will also need a drill, and metal drill bits in size 2,3 and 10. A fretsaw or some metal sawblade is essential. Some pliers and a nut driver are also helpful.
What to do:
Then, measure the extensions of your D-SUB connectors. They should be somewhere around 1.2 x 3 and 1.2 x 4 cm. Mark their outlines on the box. Watch out for position and orientiation of the connectors. You will later need to solder pins in the range from 1 to 17 from the D-SUB 26 and 2-9 and 18-25 from the D-SUB 25. Try to arrange them in a way to make them accessible for the later soldering. I used non-permanent marker, as this is stable for handling but allows easy removal after everything is done.
Drill four small holes in each corner. Holes should be large enough to allow turning of the saw, but small enough to result in a roughly 90 degrees corner. I used a size 2 metall drill. After cutting the rough outline with a fretsaw, i used a metal-sawblade to fine-tune the edges. As soon as i can squeeze in the connector, its good, as this already gives some stability. I found it best to insert the connectors from the outside. The connectors can thus be used to cover any rough edge from cutting the outlines, and they can also be easily fixated by screws. For the screws, i used a size 3 metall drill.
The holes for the BNC are very simple compared to the D-SUB connectors. Their outline is a circle, and i simply used a size 10 metall drill bit for boring the holes. The BNC-connectors i used came with a solder lug for ground connection. They need to be bend a little bit for soldering, and i found it easier to bend them before putting the BNC in, as otherwise the solder lug sits flat on the surface of the box and is hard to grasp.
Put shortly: This post describes how to make the box for connecting BVR, Magventure and Localite .