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The ABC`s of Fire Alarm Systems - Section I
The ABC`s of Fire Alarm Systems - Section I

... (5) minutes. Batteries are required by the National Fire Alarm Code in all fire alarm systems not having multiple standby generators. The control panel must also be capable of recharging the battery within a specified period after a discharge. BASIC SYSTEM OPERATION Initiating devices employed in a ...
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... TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous mater ...
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... Improved stabilization behaviour versus temperature and reduced variation in amplifier performance due to the device‘s Beta (current gain) distribution can be achieved by using an active bias circuit. Such a circuit is available as a single device from Infineon - BCR400W. For further information ple ...
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Surface-mount technology



Surface-mount technology (SMT) is a method for producing electronic circuits in which the components are mounted or placed directly onto the surface of printed circuit boards (PCBs). An electronic device so made is called a surface-mount device (SMD). In the industry it has largely replaced the through-hole technology construction method of fitting components with wire leads into holes in the circuit board. Both technologies can be used on the same board for components not suited to surface mounting such as large transformers and heat-sinked power semiconductors.An SMT component is usually smaller than its through-hole counterpart because it has either smaller leads or no leads at all. It may have short pins or leads of various styles, flat contacts, a matrix of solder balls (BGAs), or terminations on the body of the component.
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