I have no idea how to build using those. Hope you can find it but thanks anyway!The copy I had on a thumb-drive appears to have been wiped, but it is very simple a 12f628, 78L05, 5v gate drive Mosfet, and a waste spark coil.
The primary was driven with a couple of 10ms pulses every 1 second.
For better reliability I would eliminate the relay and change U1 to a higher voltage/current MOSFET with a high voltage Zener drain-gate for protection, to directly drive the coil.Designed this version a few years ago for our farm in RSA, works OK.
I was more concerned about mechanical failure of the relay, not contact failure, as mechanical relays have a rated operational lifetime, typically in the neighborhood of a million cycles or so.When you consider a 1/sec rate and the coil/contacts/cap are from a motor vehicle, where the distributor is running at a few thousand sparks/min, they last a few years in the vehicle.
No not now, but where I grew up on a dairy farm in Wisconsin the cattle were free to roam in the pasture day and night.You are obviously not a small stock farmer, the fences are not run 24/7, they are only energised to keep our livestock off certain areas of ground, or straying during daylight hours.
During the night, the animals are housed in their respective safe lock up buildings.
Never thought the number of operations a relay can make before failure was.It's not rocket science.
|Thread starter||Similar threads||Forum||Replies||Date|
|troubleshooting electric fence charger||Technical Repair||8|
|Using a screw-in fluorescent light bulb as an electric fence pulse charge indicator||General Electronics Chat||23|
|Boosting a capacitor discharge electric fence charger with an air gap?||General Electronics Chat||24|
|Neon light transformer, with primary switched on/off every second, to create a "pulsed" electric fence charger?||General Electronics Chat||50|
|W||Electric fence energizer problem||General Electronics Chat||14|
|troubleshooting electric fence charger|
|Using a screw-in fluorescent light bulb as an electric fence pulse charge indicator|
|Boosting a capacitor discharge electric fence charger with an air gap?|
|Neon light transformer, with primary switched on/off every second, to create a "pulsed" electric fence charger?|
|Electric fence energizer problem|
by Robert Keim
by Jake Hertz