"Donwill" popple @diddle .dot wrote in message
...
Years ago there used to be something called a patch board which by using
inserting pins with diodes in them you could route a DC current to
different locations. snipped

For any others who may be looking for something similar I found this.
http://monopole.ph.qmw.ac.uk/~thomas...atchpanels.htm

It may be useful.

Cheers
Don