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Showing posts with label bicolour led. Show all posts
Showing posts with label bicolour led. Show all posts

Sunday, March 6, 2022

Automatic white/red light for analog locomotive (DC)

 original article

   Most of the simple analog locomotive use DC voltage with normal or reverse polarity, normal polarity go locomotive forward and reverse voltage go locomotive backward.

   I used for test on breadboard a 5mm bicolour led (red/white) LTW30EEDYJA but for 3mm can be used OSRWPA3132A.

   I designed a simple schematic with additional 3 pieces: 2 diodes (1N4007) and a resistor (680Ω..1kΩ):


   For normal polarity for power supply of the analog locomotive white led is on
and for reverse polarity red led is on
   I make movie named automatic white/red light for loco with a 3 pins led: