By John Sanger
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Extra resources for Basic Alarm Electronics. Toolbox Guides for Security Technicians
Symbols for transformers indicate the type of core and whether it has a tapped primary or secondary coil. load from the power source. A step-down transformer is created when there are fewer turns in the secondary than in the primary winding. Step-down transformers commonly are used to provide power to control panels and other devices in alarm systems. For example, an 18VAC step-down transformer may be required to convert 110VAC to a voltage level required by a control panel. If a transformer's secondary winding is greater than its primary winding, a step-up transformer is created.
SYMBOLOGY Schematic drawings use symbols, such as the ones shown in Chapter 2, instead of pictorial drawings. If electronic components were drawn the way they look in reality, schematics would be much larger, more cumbersome, and more difficult to read. The language you speak is symbology. Words without reference keys mean nothing. For example, if you heard the word "klarn" you would not know what it means. You would have no reference point. (Klarn is not a real word. " Some of you will not. It is a real word.
If a transformer's secondary winding is greater than its primary winding, a step-up transformer is created. These types of transformers rarely are used in alarm system applications. SWITCHES A switch is a device that makes (connects) and/or breaks (disconnects) an electrical connection. It selectively allows current to pass. Single-Pole Switches Switches that make contact in only one position, such as common light switches, are called single-pole, single-throw (SPST) switches. The schematic symbol for this type of switch is shown in Figure 2 - 2 0 .