On 7/12/22 11:37, Chris Albertson wrote:
These adaptors sell for about $10 but they are not rewireable. I think
the first step is to buy both connectors. Perhaps buy a $10 cable and cut
it in half.
I still have some old rewireable serial cables from the old days when we
used RS232 serial cables. Ths is a small plastic box with a cable
coming out of each and. Inside the box is a PCB with two sets of email
header pins on 01" spacing, The kit comes with a set of male-to mae jumper
cables and we conet the sets of sockets as you like.
Actually, it was better then that. There were a set of 25 DIP switches and
if closed that connect the cables "one to one" and no jumper wire is
needed. But if the switch was open yu used the jumper to connect any two
pins.
This worked back in the day of slow signals but would fail badly in today's
world of USB-C and HDMI where signals are in the GHz range.
Now Chris, you're giving me bad dreams, imagining what such a lashup looks
like on a TDR. Time Domain Reflectometer. A smith chart from a VNA would
looking like a damaged corkscrew. TDR's do come in handier than the
turn latch on the outhouse door when looking for a bullet hole in 2000'
of 3.125" transmission line though. It can tell the tower crew where the
hole
is within 3 or 4". Been there, done that, had to make the TDR though.
On Tue, Jul 12, 2022 at 2:45 AM andy pugh <bodge...@gmail.com> wrote:
Not CNC related, but I thought that someone here might know the answer.
I want to make a rewirable adaptor (OBDII to DB15)
One neat way to do this would be with a matrix, where you plug something
into holes and that connects the row to the column.
As a CNC link (almost) I think that something like this was used on the MEC
Microsprint programmable lathes where things often called "diodes" were
plugged into holes to program the machine.
I feel that a couple of PCBs. spaced a small distance apart, could have
plated-through holes linked by "something" being plugged through them. The
problem being to find the "something" that will make contact with two holes
at the same time.
A single PCB and an array of jumpers would work, but that would be 480 pins
to keep track of
The plated-hole idea has 240 holes, but only needs 8 plugs to do the
programming I need.
2mm banana plugs do exist.
https://uk.rs-online.com/web/p/banana-connectors/7632907
But I am not sure if they will reliably connect two plated holes.
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is designed
for the especial use of mechanical geniuses, daredevils and lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912
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