On Fri, 13 Oct 2000 10:40:18 +0100, you wrote: >>What they did instead was to silkscreen a carbon-looking coating onto >>the pads for the switches. This was a single layer PCB, as well, and >>they really needed a 2-layer PCB. To get the second layer, they put >>jumpers on the board. These jumpers were the same carbon material >>silkscreened over the soldermask between pads! Obviously these = "jumpers" >>were not in high current paths. > >I have seen a Japanese stereo unit, one of those all in one midi unit = things, where the PCB was single sided, and some "tracks" were silk = screened on the component side using a conductive paste similar to that = used in hybrid circuits. This used to be quite common, as well as resistors also printed on the PCB. Remote controls often use carbon ink for interconnects.=20 -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu