The SLC-1 board has been designed to operate two bi-colour search light signal heads, one for each end of a block or section of track. The signal board can also be used to operate a two aspect led target signal that uses two separate leds.
The SLC-1 board can also be used to indicate the position of turnouts. Each SLC-1 board can be controlled manually by the operator or operate automatically when connected to other signal boards, block occupancy detectors or turnouts.
The SLC-1 board can also run independently or be tied in with other signal boards found on this website. There is no limit to the number of boards that can be connected together on a layout.
The SLC-1 board requires an external clocking source which is built into the SLC-2 board. Without this external clocking source, the board will not produce yellow on the signal head. The signal will only produce red or green. One SLC-2 board will provide clocking for up to 10 SLC-1 boards.
The SLC-1 signal board can drive both common cathode and common anode bi-color leds.
* Operates two, bi-colour signal heads.
* Drives both common anode or common cathode LEDs.
* Produces red, yellow* and green signals.
* Can be used to drive a 2 aspect LED Target signal head.
* Can operate independently or with other boards found on this website.
* Can be triggered or controlled from multiple sources.
* Terminal strip for easy connections.
* Pre collision warning output.
* Simple connections to other devices.
* Small compact design.
* Low current output for LED signals.
* Can be used with 2 lead and 3 lead bi-colour LEDs.
* Requires connection to a SLC-2 board or other external clocking source to produce yellow.
Connections to the SLC-1 board are shown for several applications. Boards can be connected independently or with other signal boards from this website. All connections should be made with the power turned off.
Single Board Operation
If using only one SLC-1 board and the Yin1 and Yin2 inputs are not being used, they must be connected to GND to prevent false signaling.
Multiple Board Operation
The SLC-1 board is designed to easily connect and work with other SLC and TSC signaling boards found on this website.
Block Detection Signal Sources
The SLC-1 can be controlled from several sources in order to display an occupied block or approach signal.
The use of a simple switch connected to the DET input will allow for manual signal operation.
Although the turnouts are connected in the same way as a manual switch, it does provide some automation for operating your signals.
Block Occupancy Detectors
A block occupancy detector which provides a logic low (ground) output works well with this board. This is the recommended way to connect the SLC-1 board as it will provide a fully automated and realistic operating signal system.
SLC-1 Board Connections
The SLC-1 board operates on 5 volts dc only. The use of any other voltage or supply will damage the circuit.
ALM - Alarm output.
555 - Connects to the 555 terminal of other SLC boards.
Yin2 - Yellow in from the next SLC or TSC board.
Yin1 - Yellow in from the previous SLC or TSC board.
Det - Block detection input.
GND - Ground or 0 volt connection.
G1 - Green lead of the bi-colour LED for the first search light signal.
R1 - Red lead of the bi-colour LED for the first search light signal.
G2 - Green lead of the bi-colour LED for the second search light signal.
R2 - Red lead of the bi-colour LED for the second search light signal.
Yout - Provides the yellow out signal to the previous and the next SLC or TSC board.
+5v - 5 volt DC input.
The signal board can operate independently or be connected to other signal boards found on this site.