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	General installation help: How to install IR sensors on a model train layout [web page]
	Basic IR (infrared) proximity detector circuits: MRD1-NV, 1 sensor, non-variable timing [pdf] -- [web page] MRD1-V, 1 sensor, variable timing [pdf] -- [web page] D2T-DS, 2 sensors, direction sensing [pdf] -- [web page] D6X, 4 or 6 sensors, LED drivers [pdf] -- [web page] replaces MRD6T and MRD6X MRD8, 8 sensors, relay outputs [pdf] -- [web page] MRD6T, [pdf] replaced by D6X MRD6X, [pdf] replaced by D6X
	Infrared proximity detector for Arduino: RIR4, Arduino shield with 4 IR detectors [pdf] -- [web page]
	Current sensing block occupancy detector for DCC DBD2 dual detector with SPDT relay output [pdf] -- [web page] DBD dual detector with SPST relay outputs [pdf] replaced by DBD2
	Grade crossing circuits for highway crossings: D2T-Xing (2 sensors) [pdf] -- [web page] MRX3 (4 to 6 sensors) [pdf] -- [web page] D6X expansion circuit (4 to 6 sensors) [pdf] -- [web page] MRX2 [pdf] out of production MRX1 [pdf] out of production
	Trackside signal circuits: GS-CA turnout signal circuit for slow motion switch machines and common-positive LED signal -- [web page] GS-CC turnout signal circuit for slow motion switch machines and common-negative LED signal -- [web page] SHS for UK-type starter and home signals at a station [pdf] -- [web page] TS2 for intermediate block signal, single 2-way track [pdf] -- [web page] TS2-D for intermediate block signal, dual 1-way tracks [pdf] -- [web page] TS3 for track signals at a single switch control point [pdf] -- [web page]
	Turnout (track switch) control circuits: D2T-2W for 2-wire switch machines [pdf] -- [web page] D2T-3W for 3-wire switch machines [pdf] -- [web page] MRD2 [pdf] out of production
	Automated exhibit layout controllers: PFRR-2W back-and-forth, for 2-wire switch machines [pdf] -- [web page] PFRR-3W back-and-forth, for 3-wire switch machines [pdf] -- [web page] PFRR-NTO back-and-forth, single track, no turnouts [pdf] -- [web page] SBRR-2W switchback, for 2-wire switch machines [pdf] -- [web page] SBRR-3W switchback, for 3-wire switch machines [pdf] -- [web page]
	Relays: LARY-AC latching relay, AC/DC dual coils [pdf] -- [web page] LARY-DC latching relay, DC dual coils [pdf] -- [web page] LARY-DCS latching relay, DC single coil [pdf] -- [web page] MRAPR, DPDT 8 amp contacts, AC/DC coil [pdf] -- [web page] SSR6, six solid state relays, SPST [pdf] -- [web page]

 

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