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Model Railroad Electronic Circuit Diagrams And PCB Boards

Electronic circuits and circuit boards that are useful for model railroads. The material here consists of the most popular circuits used by modelers.


block signal circuit diagrmThis first section is a selection from a large collection of circuits and circuit boards by Robert Paisley.  His page is no longer supported but the information is well presented and useful.

Main Page –


Signals –  A collection of circuit diagrams for block signals.  Three aspect, two aspect and spotlight signals are covered.  There is a circuit board parts list as well as a pcb board and completed signal module included in the information.

Block Occupancy Helper Circuit –  This circuit would be used to hold a BLOCK OCCUPIED condition as a train passes out of the block even if the normal detector is not sensing a train.

4 Photo-Detector With Delayed Release And Bipolar Output –  This circuit is ideal for driving signals without flicker or relays without chatter.

Stall Motor Switch Machine Drivers

Above And Across The Track Infrared Detectors – This page presents information on infrared – Above The Track and Across The Track train position detection circuits. The circuits are designed around the LM339 quad comparator chip and can use a wide assortment of matched infrared – emitter / detector pairs.

Automated Point To Point Layout –


Dogbone Reversing Loop

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