Electronics and Wiring for Model Railways by Andrew Duckworth

Electronics and Wiring for Model Railways by Andrew Duckworth

Author:Andrew Duckworth
Language: eng
Format: epub
Publisher: Crowood


Fig. 6.40 A range of different types of magnetic switch. JPR ELECTRONICS

Fig. 6.40a Normally open contact.

Fig. 6.40b Changeover contact. BRIMAL

Fig. 6.40c Normally closed contact. BRIMAL

Reed switches in glass form are very delicate and should be handled with care – the one illustrated is only 10mm long. See the section on installing reed switches for the best method of bending, cutting and soldering them.

THE SPRING-LEVER SWITCH

A spring-lever switch has a C spring to snap it from one state to the other. The switch has different actuation forces, dependent on the strength of the C spring: this can vary from 0.25N to 0.6N. Most spring-lever switches used on model railways have changeover contacts, as shown. They are not latching switches, so when the pressure is removed the switch will snap back to its resting state.

The drawing shows how a spring-lever switch is wired to indicate the position of a set of points. The R and G can be wired to red or green indicators for a visual indication as to the state of the points.



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