Facebook
Google
GitHub
Linkedin
OK, my turn to ask for input. Been trawling catalogs etc for a few days and haven't found anything that really fits.
I need to interconnect a primary PCB (on the right in the picture) with a secondary (daughter, sister?) PCB (on the left) which as you can probably guess extends the number of channels from 2 to 6 in total. The primary PCB will be on the top and has a 10 way (2 x 5pin) IDC header (in the centre) to connect to a separate processor board not shown here. 240v AC mains comes into this board via the pluggable terminal block (grey, top right), through the fuse (white, top centre) and feeds the AC/DC PSU (black box) which generates 5v and 3.3v for this board and the processor board. I need to extend this header to the secondary board without using a cable, so I need something off the back of the top board to plug into something on the lower board.
So here's the first problem. My original thinking was to use a long tailed IDC header to plug into a 10way block below (black box in the centre of the secondary PCB and yes the orientation is wrong, its on the to-do list!). But those blue boxes are 15mm high and the tails on an IDC header are are only 10mm long so won't reliably plug into a standard 10way box header, I need another 3 or 4mm at least, but ideally I want the board separation to be more like 30mm to allow the cables to the pluggable edge connectors more space to manouvre. I can get a longer 2 x 5 open pin header but thats still only 20mm and there isn't space to mount that on the back of the top PCB alongside the IDC header without making the boards longer.
My second problem is to get 240v AC from the top board to the lower board. Its only 24W max so 100mA rms so I was planning to use a similar approach but with 5.08mm rather than 2.54mm spacing (Live and Neutral only, Earth goes via the board spacers). This connector would be situated in the blank area at the front of the PCB, but I've run into the same issue.
Reason I dont want a cable interconnect is firstly there are too many cables on all sides and secondly I don't want the SPI data to come into close proximity to AC. The board layouts work fine and test OK on a hand-wired mock-up. I'm trying to keep the PCBs to 90mm wide by 100mm long. An extra 15mm length almost triples the price!
Thoughts anyone?
I need to interconnect a primary PCB (on the right in the picture) with a secondary (daughter, sister?) PCB (on the left) which as you can probably guess extends the number of channels from 2 to 6 in total. The primary PCB will be on the top and has a 10 way (2 x 5pin) IDC header (in the centre) to connect to a separate processor board not shown here. 240v AC mains comes into this board via the pluggable terminal block (grey, top right), through the fuse (white, top centre) and feeds the AC/DC PSU (black box) which generates 5v and 3.3v for this board and the processor board. I need to extend this header to the secondary board without using a cable, so I need something off the back of the top board to plug into something on the lower board.
So here's the first problem. My original thinking was to use a long tailed IDC header to plug into a 10way block below (black box in the centre of the secondary PCB and yes the orientation is wrong, its on the to-do list!). But those blue boxes are 15mm high and the tails on an IDC header are are only 10mm long so won't reliably plug into a standard 10way box header, I need another 3 or 4mm at least, but ideally I want the board separation to be more like 30mm to allow the cables to the pluggable edge connectors more space to manouvre. I can get a longer 2 x 5 open pin header but thats still only 20mm and there isn't space to mount that on the back of the top PCB alongside the IDC header without making the boards longer.
My second problem is to get 240v AC from the top board to the lower board. Its only 24W max so 100mA rms so I was planning to use a similar approach but with 5.08mm rather than 2.54mm spacing (Live and Neutral only, Earth goes via the board spacers). This connector would be situated in the blank area at the front of the PCB, but I've run into the same issue.
Reason I dont want a cable interconnect is firstly there are too many cables on all sides and secondly I don't want the SPI data to come into close proximity to AC. The board layouts work fine and test OK on a hand-wired mock-up. I'm trying to keep the PCBs to 90mm wide by 100mm long. An extra 15mm length almost triples the price!
Thoughts anyone?
