Thoughts Please on "Electric Fence Circuit"

ericgibbs

Joined Jan 29, 2010
18,766
hi Bob,
Downloaded your circuit, I will check it out in simulation.
Check the 12V supply to the top of the transformer, using a scope.
Also that Q2 is saturating when pulsed On and Q2 switches Off fast at the end of the On period.
E
 

ericgibbs

Joined Jan 29, 2010
18,766
hi Bob,
Check the P MOSFET drawing/connection, note the inbuilt Drain to Source Diode.

E

BTW: Did you get a series ballast resistor with the vehicle ignition coil. Usually approx 3R.???
 

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ian field

Joined Oct 27, 2012
6,536
Hi

Having built this simple circuit which seems to work fine, I'm looking for you guys to cast an eye over it, especially on the high voltage side ( after IC2 ).

The two diodes I've used ( D2 & D4 ) are the best I could find in "Circuit Wizard" library but I'm open for criticism on both the necessity of use and the values to counter spikes. The MOSFET seems to work well and only gets warm on the heat sink.

I set the "pulses control" to achieve 0.5Hz and the "power control" to about 75% to achieve an output pulse of 4KV

Circuit:
View attachment 162894

Your comments would be appreciated
Projects were plentiful in hobby magazines up to about the 80s - usually vaguely resembling a CDI with a pulse generator added and driving a bog standard car IGN coil.
 
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