On Sun, 11 Jan 2004 14:05:21 GMT, (Mike W)
wrote:



The diode + relay circuit should be obvious to you, I use a 9v relay
coil with a 1N4001 in the activation side and a DPDT contact,in
parallel, to switch the power. For the power you are talking about a
14pin DIL relay should be adequate.

HTH, Mike W, G8NXD qthr

I'd like to call it "the PYE method" since it is generally applied in
those Westminster, Vanguard and Cambridge sets, while other
manufacturers only use a diode. I've copied it for the larger sets
which are often used in different places. The application of relay has
the advantage that nothing happens if you use the wrong polarity -
unless you have shortcircuit between two chassises, then you should
apply a two-pole relay.
Make sure that the relay stays operated under different operation,
check that the relay operates with 9V. Remember to put a diode or
other spark suppression across the coil, too.

73
LA8AK, http://home.online.no/~la8ak/c.htm
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