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When there is DCC track current passing, the transformer generates a voltage at the secondary (which is the output transformers center tapped primary winding). This Voltage is rectified and across the 10 ufd capacitor bias's the IC which gives a high impedance output and allows the transistor to turn on. This can be used to operate a relay or logic circuits.
The 1N5404 back to back diodes at the input are to protect the transformer if there is a track short circuit.
When there is DCC track current passing, the transformer generates a voltage at the secondary (which is the output transformers center tapped primary winding). This Voltage is rectified and across the 10 ufd capacitor bias's the IC which gives a high impedance output and allows the transistor to turn on. This can be used to operate a relay or logic circuits.
The 1N5404 back to back diodes at the input are to protect the transformer if there is a track short circuit.
LINK TO IMAGE - tblock.gif
Circuit Schematic
