====== A Simple Approach to Noise Control ======

When dealing with noise, it helps to think in three steps.

{{ :noise_book:noisepath.png?nolink |}}

First, try to reduce noise where it is generated.

A relay, contactor, or other switching device can create sparks when it turns on or off. These sparks generate noise that can affect nearby equipment. Devices such as spark suppressors help reduce noise before it becomes a problem.

Second, try to stop noise from traveling through cables.

Once noise is generated, it often travels through power lines and signal cables. Noise filters and ferrite cores are commonly used to reduce the amount of noise that reaches other parts of the system.

Finally, protect the equipment receiving the signal.

Even after taking the first two steps, some noise may still find its way into the system. Protective components such as TVS diodes help prevent this remaining noise from damaging sensitive electronics.

In short, the best strategy is simple:

* Reduce noise at the source
* Stop it from spreading
* Protect the equipment that receives it

Following these three steps will solve most noise-related problems encountered in the field.

[[index|←Noise Is My Friend]]