Electric fence pulse generator circuit,wise company emergency food supply kit 3d,earthquake readiness at work - How to DIY

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These circuits will work great for driving ignition coils for high voltage but they can be susceptible to damage from inductive spikes. If you build an ignition coil driver to make high voltage sparks and arcs, you will need some sort of EMI protection for your circuit. Snubbers are a tricky subject, but in general they are used to reduce electromagnetic interference (EMI) or voltage spikes.
You can also place a small neon indicator bulb (Ne1)in series with a 1k resistor and place this between the low voltage wires to your ignition coil.
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It is not essential to use two 12V batteries like shown in the circuits shown below, but it will allow you to obtain bigger sparks. While these are cheap and high temperature tolerant, they are susceptible to voltage spikes caused by the inductive nature of the load (ignition coil).
When an ignition coil is being driven unloaded (open circuit on the output) there will be significantly increased back emf and risk of damaging the driver circuit. There are many ways to reduce EMI and it can often be useful to use various snubbers in different parts of the circuit. These are semiconductor devices which will only begin conducting when the voltage between its terminals exceeds its rated value. This means to get a high output voltage you must be able to stop the power flowing into the coil as quickly as possible.
Pretty much any power transistor, IGBT or MOSFET can be used in this circuit as long as it is rated for at last 5A and 100V. This means that the output voltages of each coil are out of phase or opposite to each other (when one is positive, the other is negative).
If you see it glowing, you need a better snubber like RC1 (top diagram) or a MOV (varistor) rated to clamp the voltage below the maximum your components will tolerate. Incorporating a basic and simple to install design, you can have it set up in just a matter of minutes. Using this configuration the output is taken from the two coils output terminals, whereas the circuit above uses the output terminal and ground.

It also includes an early warning indicator which will show you how severe the back emf is from your load.
These are known as dissipative snubbers because the excess energy is disspated as heat or light. Generally speaking, a bigger capacitance and smaller resistance will snub more, but also absorb more drive power thefore reducing efficiency.
In the example shown above, the MOV will short out any spikes coming from the load, but it is also shorting the driver circuits output for the same brief instant. The MOV chosen must be able to dissipate the power ans have a voltage rating that will cause it to activate before the voltage gets too high for the drive circuit.
Be it a few hundred metres or 8 km, our Fence Energiser can continuously keep your fence charged.
To do this a spacial square wave power supply is uses which switches power on and off to the coil hundreds or thousands of times per second.

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