A point about the circuit in post #2. A 2N3055 is not a suitable transistor to drive the ignition coil as it's colletor emitter breakdown voltage is too low. You need the type of transistor that is used in the line output stage of CRT TVs. When the device turns off the back emf from the coil primary is several hundred volts. If you attempt to clamp this it will reduce the output voltage from the secondary.

Les.

 

Here's a thought:
Yardy - where are you located?
ak

Post #!

"- A cdi module wont be hard to source
out here in Jamaica "

 

If the TS already has a flyback transformer I suggest seeing if it will produce an adequate shock. There are a number of posible primary connections so some experimenting will be required.

 

If the TS already has a flyback transformer I suggest seeing if it will produce an adequate shock. There are a number of posible primary connections so some experimenting will be required.

A TV flyback transformer has very little magnetic material so would not be able to store much energy for the spark and would likely not deliver enough to charge the capacitance of a fence, which typically is requires a few tenths of a Joule.

 

That is certainly possible, but if the flyback is already in hand it could be worth trying it. And it may also happen that the TS may be able to replace the powdered iron core with a steel bolt and a few washers on each side and deliver more energy that way.