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• The GCA modules

By Peter Giling
	IR led, not on this picture, should be connected to J2 The 5 pin connector is conncted to GCA133 or GCA141

To avoid any problems on longer connections between sensor and GCA133 or GCA141 board, the sensor is mounted on a little driver board.
In case of use for GCA141 wheelcounter, the outside of IRled , positioned between the rail, is liable to be short circuited to the rails by train wheels.
Precausions have been made to avoid that ths will cause damage to the IR-led, or any other parts in the system.
Extra power filter is on-board, to make sure the sensor is working according specifications.
The IR led can be connected to J2, or can be mounted straight on board, instead of J2