How to connect a coil. Coil Storage: Safe & Flexible.



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Manually creating Sparks (Ignition Coil + 9v Battery)



How to connect a coil

While these are cheap and high temperature tolerant, they are susceptible to voltage spikes caused by the inductive nature of the load ignition coil. Ones with higher voltage ratings will be less likely to be damaged by spikes. Further protection methods are outlined lower down this page and in the comments.

RC1 is used to help suppress high voltage spikes that can destroy the power transistors. T2 represents two power transistors connected in parallel and mounted on a heatsink. This next circuit is designed for a higher powered output. Two ignition Coils are connected in parallel but with opposite polarity. 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.

Using this configuration the output is taken from the two coils output terminals, whereas the circuit above uses the output terminal and ground. These circuits will work great for driving ignition coils for high voltage but they can be susceptible to damage from inductive spikes.

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. It also includes an early warning indicator which will show you how severe the back emf is from your load.

Protecting Your Ignition Coil Driver 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.

Without it, it is very likely you will destroy the transistors or driver ICs. Snubbers are a tricky subject, but in general they are used to reduce electromagnetic interference EMI or voltage spikes. There are many ways to reduce EMI and it can often be useful to use various snubbers in different parts of the circuit. These diagrams represent a few possible ways you can snub EMI in an ignition coil driver. These are known as dissipative snubbers because the excess energy is disspated as heat or light.

The top digram uses a series connected capacitor and resistor. The values used will depend on your drive frequency. See RC1 at top of this page. Generally speaking, a bigger capacitance and smaller resistance will snub more, but also absorb more drive power thefore reducing efficiency. A compromise must be found that best suits your setup. These are semiconductor devices which will only begin conducting when the voltage between its terminals exceeds its rated value.

It will stop conducting when the voltage goes low again. 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.

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.

This bulb will begin to glow when the back EMF reaches about V or more. 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.

How to connect a coil

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6 Comments

  1. Triaxial cable is often used for probe connections. These meters have linear scales. Look for things like broken wires, corrosion, etc.

  2. Moving-iron[ edit ] Moving iron ammeters use a piece of iron which moves when acted upon by the electromagnetic force of a fixed coil of wire.

  3. Picoammeters are used for sensitive measurements where the current being measured is below the theoretical limits of sensitivity of other devices, such as Multimeters.

  4. Application[ edit ] The majority of ammeters are either connected in series with the circuit carrying the current to be measured for small fractional amperes , or have their shunt resistors connected similarly in series.

  5. Switched shunts are rarely used for currents above 10 amperes. This made these instruments usable only when aligned with the Earth's field. Other modern picoammeters use log compression and a "current sink" method that eliminates range switching and associated voltage spikes.

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