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Links to electronic circuits, electronic schematics and designs for engineers, hobbyists,
students & inventors:
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Signal transformer
application - Coilcraft Power Magnetics
Application Note. . .
Simple Algorithm Transforms
Filter Coefficients - 01/21/99 EDN Design Idea
(File includes several ideas, scroll to find this one. )To synthesize infinite-impulse-response (IIR)
-filter functions, expressed as H (z) , you commonly use analog prototype-filter functions, expressed as
H (s) , using the bilinear-z transform. This operation entails some algebraic complexity in calculating
the filter coefficients. The simple algorithm shown here transforms the prototype-filter coefficients
(W0, W1, W2) to the IIR digital-filter coefficients (U0, U1, U2). . . . [by Frank Vitaljic, Bellingham,
WA]
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Simple Switching Regulator - includes several designs, scroll down to find this one. When batteries are used to power
lower voltage circuits, a switching regulator is desirable to conserve battery life. There are excellent ICs
that can do the job with great efficiency and small size. An example is the (www. maximic. com) MAX639 which
converts inputs from 5. 5 to 11. 5 volts to 5 volts at up to 225mA. The only additional parts are an
inductor, schottky rectifier and a couple of capacitors. The following circuit is a discrete switcher similar
in power handling capability to the MAX639. The performance is somewhat inferior to the IC switchers but
suitable components can be found in most junk boxes. . . . [Designed by Charles Wenzel] |
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Step Down Rectifier Makes a Simple DC
Power Supply - 04/09/98 EDN Design Feature(Several circuits included.
Scrol to find this one) A simple and useful nonisolated rectifier features voltage step-down operation,
acceptable Class A line-current harmonics, inherent short-circuit protection, and, optionally. . . [by Nathan O
Sokal, Design Automation Inc, K Kit Sum, Consultant, and David C Hamill, Surrey Space Centre]
switcher converts 5
to 24V - 02/16/98 EDN Design Idea (File contains several
circuits, scroll to find this one) In µP/µC systems, you sometimes need to use many output ports and update all
the ports simultaneously. For instance, in systems that use multiplexing techniques, the output ports require
refreshing for every scanning period. One example is a system of multiple dot-matrix LEDs. Suppose that an
N-column, 8x8 LED matrix uses a row-scanning technique. Every eight-dot column of the nth LED connects to the nth
port (n=1. . . N) and the mth row (m=0. . . 7), in which row a switching transistor controls all the LEDs. . . .
[by Paul C Florian, Plano, TX]
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