I must be incredibly dense because I am just not getting it. I know X turns on a primary and X(2) on the secondary is stepping up, and that is about as far as I get. What I am trying to do is step up some electric fencers that have gone bad. Some came out of the package that way and just did not get returned others made it 6 months some 4, I have quite a few of them so I don't need to purchase another I just need to step up their output and be doing something this coming winter. So here is my plans and you guys tell me what ever it is you are going to tell me.

K, each fencer has a ground and a live, it is my live wire that has a tickle for the output. Now I take a pvc pipe and lay down 100 turns glue ends and then paper and lay down 200 turns. Can I paper and lay down a third and a fourth on the same existing lays? If I cant that's ok I can do multiples.

Now what do I do with the coiled wires? Do I loop and solder with a capacitor between them and then affix a lead to another transformer if it is needed?

I know I am using inductance to step up and I know a coil is not a coil unless it is doing work like inducting something else and then on to its work but all the diagrams I look at are not what I am thinking of which I know should be achievable.

I guess what I am describing could be a tesla coil which is fine but all I really want to do is blow up my multimeter so I know I am on the right track, besides I need a new meter anyway and this would be a good reason to go fetch one.

I suppose I could fix the insides but I have already opened a few up and my eyes got crossed up.

 

The circuit was designed with a specific transformer in mind. It won't work with just any set of coils attached.

Transformers are FM, as a friend of mine likes to say, F'ing Magic. There are loads of parameters. What was in there was very likely a ferrite or iron core transformer, very likely set up as a blocking oscillator or something similar. This relies on certain characteristics of the transformer to operate. An air core coil won't have the same characteristics.

The Joule Thief seems to be a bit similar to a blocking oscillator that will accept a wide variation in transformer characteristics. I've seen some examples online where that design has been used to generate high enough voltages to light a fluorescent bulb.

However: an electric fence charger (I presume you don't mean an electronic robotic fencer) must be safe for humans to touch. And not start any fires just because a weed grew or a branch falls on it. Generally, they are also on a rather low duty cycle, so that an animal rubbing against it won't get used to it.

Perhaps you should just buy better electric fence chargers. Otherwise, if someone gets hurt, you'll be on the hook for damages.

 

Darn it, you are the second guy that has said that; the being on the hook for it.

Look I am not trying to up the volts off of a good one I just want to bring all these ticklers up. These things advertise (well some of them) at three miles/twenty miles....∞. I have a perimeter of 1,700 foot. All I want to do is boost the out put.

I have an input and I want to boost the out put. look I could just go hang a hot lead off of an outlet on it and call that good but I don't want to do that.

 

The only way is to either replace the pulse transformer, or use a Cockroft Walton booster to increase the output voltage, the only problem is that these circuits produce DC, whereas the fence output is pulsed .

 

The fencers I've seen (many models, all but a very few from the same manufacturer) all used an open magnetic path iron core transformer similar in function to an automotive ignition coil. A capacitor charged to a high voltage was discharged through the primary, using an SCR, to generate the output pulse. Any attempt to do anything to change the output voltage by addition of another transformer or other circuitry would be largely futile. You can't change the amount of energy delivered by changing the transformer. If you increase the voltage output for the same energy input, you simply increase the losses due to leakage currents in the fence and actually decrease the amount of fence that can be effectively energized. A fencer of that design that wasn't delivering the specified output would typically have issues with the charging or discharge of the capacitor. A single shorted turn in the transformer can render it useless.

 

Show us a clear picture of the inside.

 

Do you have a circuit of the fencer?
I have found a lot fail with moisture getting in.
And some have contacts between boards and these give trouble.
You need to find what has failed in the units you have and see if you can fix them. To increase the power, a bigger transformer and charge capacitor will probably be needed. But, as has been mentioned, that may be dangerous.
Be careful when playing around with these as they store quite a zap!
More info on your actual models will help.
Are they mains or battery operated?
Check any electrolytic capacitors.

And I second (or third....) not trying to add an extra transformer. Fix what you have.

 

OK, got it. sure I can supply make and model and refurbish I just thought I could cheat and build on what I have. As for pictures I can do that also. What you will find interesting is I have a fencer (old one) that operates off of an eccentric utilizing a mercury switch on the eccentric.

Might take a day or two as I am pressed to get chores done right now.