Ciruitron SD-1 Signal Driver 3 color
SD-1 SIGNAL DRIVER, 3 ASPECT, 3
LAMP / LED
The CIRCUITRON SD-1 provides all the logic
and output drivers to control any 3 lamp, 3
color Block Signal or multiple
lamp Position Light Signal. The
three outputs on the SD-1 can
each control a maximum of
250 ma. and they will power
either LED or incandescent
lamp type signals. If your
signals use LEDs, make certain
that they are connected with a
common positive (anode)
connection of all LEDs (the signal should have
4 wires, and the “common” connection
should go to [+]. Most, but not all,
signal manufacturers follow this design.
Detection circuits (such as the
CIRCUITRON BD-1, BD-2 or BD-3) that
provide a logic low (- or ground) output
are needed for a minimum of 2 blocks
to display all three aspects. The SD-1
is constructed on a 2” x 3” printed
circuit board and requires a 10 - 18 volt
DC input for proper operation.
