The CIRCUITRON SD-1 is a signal driver module for model railroaders wiring three-aspect signals into a layout. It controls three-lamp, three-color block signals and multiple-lamp position light signals.
SD-1 Signal Driver Details
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Brand: Circuitron Electronics
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Product type: Signal driver electronics module
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Layout use: HO and N scale model railroad layouts
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Outputs: Three outputs, each capable of controlling up to 250 mA
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Signal compatibility: Three-lamp, three-color block signals and multiple-lamp position light signals
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Lamp compatibility: LED or incandescent signal lamps
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Input: 10–18 volt DC
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Construction: 2 x 3 inch printed circuit board
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Set size: One SD-1 signal driver module
Wiring and Layout Notes
When using LED signals, use a common positive anode connection for all LEDs. The signal should have four wires, with the common connection going to [+]. Most, but not all, signal manufacturers follow this design.
Detection circuits such as the Circuitron BD-1, BD-2, or BD-3 provide the logic-low output needed for a minimum of two blocks to display all three aspects.
Related Resources
Browse Diorama Accessories for complementary layout components, or visit the Circuitron Electronics website for manufacturer information.
