GIRR diode matrix
The Geologically Improbable Railroad
Diode Matrix
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The other part of the interlocking turnout
control system is a diode matrix. This simple circuit determines
which turnouts should be thrown in which direction to set up a
route through the trackwork.
The 5474 converter circuits energize a pair of rows, one
positive and one negative. Diodes are connected between the rows
and columns. Each turnout motor is connected to one column. The
presence of a diode at a junction will cause turnout to be thrown
when its row is energized.
© 1997 George Schreyer
Last Updated Nov 4, 1999
