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LED Circuit for Electric Fence Light

Crashtest007

Mar 3, 2024
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Mar 3, 2024
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Hi All,
I am new here , and to Electronics so plese go gentle on me! :)

I have a Circuit Diagram that I have created in Adobe Illustrator to hopefully Show what I have so far.

I found an OLD Fence Light. The Light looks as though it has been run over. I am trying to "Back Engineer" the Light and made this Diagram.

Anyway! I would like to Build this myself and have a "Basic" knowledge of electronics. I haven't built this YET and would like to know if this Circuit would WORK.

You basically hang the + Positive lead on the "Hotwire" of the Fence and connect the - Neg to earth wire / post on the electric fence. It draws the power from the fence pulses itself, so no batteries are required.

Thanks for your help in Advance !
Wayne
 

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  • LED Circuit Diagram for Electric Fence.png
    LED Circuit Diagram for Electric Fence.png
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Martaine2005

May 12, 2015
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Use an old sparkplug.
I think OP wants visual of pulses and not to just check the fence.
To check the fence is working, simply wee on it. Only hurts for a minute:)
Your circuit should work although you might want a heftier diode depending on fence voltage.
 

Crashtest007

Mar 3, 2024
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Mar 3, 2024
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I think OP wants visual of pulses and not to just check the fence.
To check the fence is working, simply wee on it. Only hurts for a minute:)
Your circuit should work although you might want a heftier diode depending on fence voltage.
That IS Correct! Visual Pulses. I have checked the Fence many times with a jolt to the arm or Head. So all references to holding to check if woking will fall on Deaf Ears. There's Always one ;) and that's usually me... Ha Ha Ha
 

Bluejets

Oct 5, 2014
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I think OP wants visual of pulses and not to just check the fence.
To check the fence is working, simply wee on it. Only hurts for a minute:)
Your circuit should work although you might want a heftier diode depending on fence voltage.
I did realise that.
One we used could see over 1/2 mile away at night.
No need to piss on it either as a blade of grass will give a decent indication.
 

danadak

Feb 19, 2021
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Feb 19, 2021
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Electric fence V, at only leakage levels, in the 10 kV range. If you
load it with LED kinds of current the fence operating V will drop
significantly.

A cheap HV diode could be microwave oven diode like :

1709471844991.png

You also have a problem with resistors that can withstand HV w/op arcing, so use ones with lead
distance that can prevent arcing :

1709468900786.png

Or you could use a HV cap........

You will also want to coat the circuit to prevent moisture/humidity type arcing,
silicon rubber (not sure it can handle V, chk this out).

The value of the R experiment with, maybe start with something like 100 uA
current for the LEDs......I think if you attempt in mA range would compromise
fence effectiveness.


Regards, Dana.
 
Last edited:

crutschow

May 7, 2021
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May 7, 2021
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I recommend using real neon lamps or tubes in series with a high resistance for the indication.
The current LEDs require to light will likely kill the fencer voltage.
 
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