I made an electric fence charger today using car ignition coil

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Here is the circuit diagram of an electric fence charger I made today. I tried to design something with the minimum of parts for non-electronic gurus (and guresses). Yes, I know the relay is clunky and wastes power but it avoids some of the problems with very high voltages associated with the coil's action, and besides, the clacking noise tells you it is operating.

-- john hill (john@cnd.co.nz), December 24, 2001


Your picture didnt work. Your trying to reference your D drive in the photo. Also a .bmp file will no show up even if the correct URL is used. must be a jpg or gif.

-- Gary (gws@columbus.rr.com), December 24, 2001.

OK, thanks Gary, better do a bit of reading!

-- john hill (john@cnd.co.nz), December 24, 2001.

I have re-consulted my guru and have come to the conclusion that I can't easily 'publish' this little circuit diagram on here, any suggestions please!

-- john hill (john@cnd.co.nz), December 24, 2001.

if it's a bmp file you made with MSPaint, I'll convert it to jpg and post it here if you want. Email it to; daytrader@LA.com

-- Dave (something@somewhere.com), December 24, 2001.

-- Dave (something@somewhere.com), December 24, 2001.

What's the pulseing rate? How long do you think that relay is going to last? Is it [horn relay] not made for very intermittent duty?

-- Jim-mi (hartalteng@voyager.net), December 24, 2001.

Thanks for posting the picture Dave.

I tried to design something with the minimum of parts and to keep the complexity down. There are some less than optimum aspects. The pulse rate is about 50% higher than I would like for an electric fence but I doubt that will cause any problem except the obvious one of shortened battery life. The horn relay is indeed desigined for intermittent use but the coil I tried in my prototype pulls only about 4 amps whereas a horn appears to draw up to 20 amps, this should make the contacts last longer plus the condensor tends to keep the contacts clean. A cheap relay might break it's spring eventually.

A better technical approach would be to use a solid state switching circuit rather than the relay and something like a 555 for the timing. An even better idea would be to buy the kit for the project published by Silicon Chip magazine.

The question asked was for a simple electric fence charger using an ignition coil and that is what I have tried to do. The prototype klacked away in my garage for 24 hours with no sign of a problem.

-- john hill (john@cnd.co.nz), December 25, 2001.

Thanks John!! Hubby's been looking at it and saying "Hmmm, uh-huh, hmmm...." I really appreciate your time and effort to figure this out and post it - in an easily understood mannner for those of us without electronic knowledge. And thanks to Dave too, for posting the diagram! We've just got all kinds of folks with useful knowledge on here!!

-- Polly (tigger@moultrie.com), December 25, 2001.

John, Did you (or any of your neighbors) experience any problems with broadcast radio or television interference when you were testing this devise?

-- Jerry Allen (jkells@bellsouth.net), February 11, 2002.

If you will send me the pictures i will make them Web compatable as GIF images using Paint Shop Pro V6, for examples please see my official Webpages.

Les Thurbon Webmaster Archery A.C.T. Society http://www.netspeed.com.au/lwt Canberra Archery Club http://www.canberraarchery.com.au 2002 World Field Archery Championships http://www.canberraarchery.com.au/worldfield.htm

-- Les Thurbon (lwt@netspeed.com.au), May 12, 2002.

Neither of the pictures showed up on my screen. I have a Power Macintosh 6100. Is that the problem or do I need certain applications to be able to see the diagram?

-- Mac in AK (nospam@no.Spam), May 12, 2002.

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