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Article: AC line powers microcontroller-based fan-speed regulator.
- Article from:
- EDN
- Article date:
- November 9, 2006
CopyrightCOPYRIGHT 2006 Reed Business Information, Inc. (US). This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Abel Raynus, Armatron International Inc, Malden, MA
Edited by Brad Thompson and Fran Granville
A microcontroller requires dc operating power in the 2 to 5.5V range, an amount that a battery or a secondary power source can easily supply. However, in certain situations, a microcontroller-based product must operate directly from a 120 or 220V-ac power outlet without a step-down transformer or a heat-producing, voltage-decreasing resistor. As an alternative, a polyester/polypropylene film capacitor rated for ac-line service can serve as a nondissipative reactance (Figure 1 ). Capacitor C1 , a 2-[micro]F AVX ( www.avxcorp.com ) FFB16C0205K rated for ...
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