- #1
Guineafowl
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My home-made energiser runs off a car battery and uses a 555 timer to pulse a Darlington-style pair of transistors. These pulse the primary of an ignition coil.
Since an electric fence is an open circuit, I'm concerned about excessive voltages developing in the coil secondary causing degradation of the insulation.
I'm looking for device that can limit the output to, say, 10 kV. Is there such a thing? A spark gap would be the simplest, but would be noisy and perhaps cause local RF interference. A chain of MOVs? I gather these wear out over time.
I've tried to find schematics of commercial units (yes, I know I could just buy one) with no luck. I assume they use transformers able to cope with high OCVs.
Any ideas?
Since an electric fence is an open circuit, I'm concerned about excessive voltages developing in the coil secondary causing degradation of the insulation.
I'm looking for device that can limit the output to, say, 10 kV. Is there such a thing? A spark gap would be the simplest, but would be noisy and perhaps cause local RF interference. A chain of MOVs? I gather these wear out over time.
I've tried to find schematics of commercial units (yes, I know I could just buy one) with no luck. I assume they use transformers able to cope with high OCVs.
Any ideas?