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EOT SIGNAL LED

W&WW&WOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

I have several dead end hidden yards that I want to hook up flashing 5mm LEDs to flash providing a visual warning when the train gets approximately 10" or so from the end of track(END OF TRACK "EOT").  I will have an insulated rail that will trigger the LED.  I want to use the AC track power for the LED which operates on DC.  I can get a non flashing LED to work using a resistor, but a flashing LED will light but not flash?   What do I need to make the 5mm LED flash??  My electrical experience is limited.  

Any suggestions to make this work. OR  other simple solution to make an EOT indicator work would be appreciated.

 

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W&WW&WOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER
gunrunnerjohn posted:

You need filtered DC for a flashing LED.  Use a diode, resistor, and a 35V 100uf capacitor.  Here's a diagram that illustrates it, and it also has the 22uh choke for DCS compatibility.

Gunner John      Thank you for your reply.   Being not knowledeable with electrical components, what is a 22uh choke?   Appears sequence is choke, capacitor, resistor, led?   I have some capacitors, how do I identify them??  Do you have any suggestions where I can purchase items you suggest that I need??   Thank you very much for your help.

R RJROGR Forum Member

Capacitors should be marked with capacity, maximum working voltage, and polarity.  The diode & the LED GRJ shows have a band to indicate which pole is +.  The + pole on the capacitor gets connected to them.  A  22uH choke is a small coil; uH stands for micorhenry's, the unit to measure inductance.  Tye capacitor he shows has 330 mfd (microfarads) of capacitance, the unit to measure the charge a capacitor will hold.

W&WW&WOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER
Martin Derouin posted:

There is a Forum sponsor at the top of the page, Evans Designs, they have 5mm flashing LED's,  I put one in a Lionel water tower and going strong after 5 years...

Marty

Marty, thank you for your steering me to Evans Design.  Appears they have 5mm flashing LEDs that I can use with the track power for my EOTs, which will eliminate my need for capacitors, resistors etc.  Will order and see if their LEDs will do what I want.   Thanks again for providing your input.

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