Chapter 17. Getting Rid of Interference and Noise
With electronic equipment seemingly everywhere and much of it wireless, is it any wonder that sometimes they interact in ways we don't expect? The result can be an occasional glitch, a bit of noise, or even complete disruption. This chapter will show you — a circuitbuilder and electronic-er — how to take the initiative and keep your equipment operating properly.
Dealing with Interference
Interference, either to or from your electronics, refers to unwanted signals or the effects caused by other signals. There are two types of interference: the kind you experience from external sources and the kind caused by your devices. We'll start with interference that your stuff receives externally — starting with radios and other RF receivers (some of them inadvertent) that you might have. Figure 17-1 shows several examples of interference-fighting devices and components as follows:
Telephone filters: Installed in telephone lines.
Cables and wires: Passed through or wound around ferrite cores.
High-pass filters: Block lower-frequency signals while passing higher-frequency ones.
RF chokes: Inductors (coils) used inside equipment to prevent interference to or from the equipment.
Figure 17-1. All these devices ...
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