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Three aspect driver using a linear I.C. A low voltage on the inputs, Red or Yellow, will turn on the LED, turning off the Green aspect. The red drive is also fed to the previous signal for interlocking. A blocking diode should be shown in this output to prevent a Yellow low on the previous from forcing red on this. The resistors supplying the LEDS can be individually selected to provide a more uniform colour level.
Three aspect driver using a linear I.C. A low voltage on the inputs, Red or Yellow, will turn on the LED, turning off the Green aspect. The red drive is also fed to the previous signal for interlocking. A blocking diode should be shown in this output to prevent a Yellow low on the previous from forcing red on this. The resistors supplying the LEDS can be individually selected to provide a more uniform colour level.
LINK TO IMAGE - sig-324.gif
Circuit Schematic
