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Acceptable Voltage Indictor__ - I have used this circuit many times in custom test fixtures where a simple go-no go
indication was needed. The circuit can also be used to adjust a particular voltage be within specific
high or low limits. The three LEDs will indicate if the voltage is . . . [Circuit by David Johnson
P.E., 02/09/02]
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Algorithm Converts Random Variables to Normal__ - 05/11/95 EDN Design Idea Although normally distributed random variables are essential
for many engineering analyses, software packages usually provide only a function that generates uniformly
distributed random samples over the range [0,1].… [by Edward Beadle, Brookhaven National Laboratory,
Upton, NY]
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Algorithm extracts roots of decimal numbers__ - 04/29/99 EDN Design Idea (contains several designs, scroll to find this one) "Algorithm
extracts cube root" (EDN, Jan 15, 1998, pg 100) covers only the one-third power (cube root). In contrast,
the C routine in Listing 1 calculates the Kth root (X1/K) of positive decimal numbers X. Both K and X can
vary widely. You type in X, K, and an estimate of the root; the routine then calls the calcRoot function
in the software program. Upon calculating the root, the routine prints on screen the number of iterations
performed and the root result X1/K. … [by Frank Vitaljic, Bellingham, WA]
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Algorithm Generates Random Signal__ - 12/05/96 EDN Design Idea A common way to simulate a sequence of bandwidth-limited-noise
samples is to start with a sequence of uncorrelated random numbers that have a suitable distribution and
then pass that sequence through a filter. Unfortunately, filt… [by Ove Johansson, CelsiusTech Systems,
Stockholm, Sweden]
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Algorithm
Keeps Data Safe__ - 01/21/10 EDN Design Idea
Prevent data loss against power blackouts and other interruptions… [by Luis G Uribe C, Caracas,
Venezuela]
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Algorithm Nulls DC Offsets In DS__ - 09/15/94 EDN Design Idea One problem associated with converting analog signals to
digital samples is ensuring that the zero level of an analog signal (minus its dc offset, if any)
converts to a digital sample of exactly zero. If the analog signal's zero … [by V Solovyov, Rossiya,
Russia]
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Algorithm Transforms
Filter Coefficients__ - 01/21/99 EDN Design Idea
(File includes several circuit ideas, please 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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Algorithm Yields Precise Bessel Function__ - 11/09/95 EDN Design Idea You frequently need to determine the Bessel function of the
first kind, Jn (x) , for the analysis of modulated and complex waveforms. Such analyses could include,
for example, routine verification of transmitter phase- or frequency… [by Brian Geelen, Satellite
Microwave & Communications LtdWeert, The Netherlands]
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Amplifier for a Xenon
Lamp Flash Detector __ - This circuit uses a
small 2.5mm square photo diode in conjunction with a 100mH coil to detect the short light flashes from a
xenon lamp. The coil makes the circuit immune to normal room lights. Its 10mv sensitivity can detect
light flashes from a range . . . [Circuit by David Johnson P.E., 02/15/02]
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AN-311: Theory & Applications of Logarithmic
Amplifiers__ - National Semiconductor Application
Note …
__AN-405: Increasing the Speed of the
Output Response of the AD606__ - AN-405 Analog Devices App
Note…
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AN544: Math Utility Routines__ - Microchip Application Note Published 26-Aug-97 …
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AN-603: A
Compact Algorithm using the ADXL202 Duty Cycle Output__ - AN-603 Analog Devices App Note - …
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AN-604: Using
the ADXL202 Duty Cycle Output__ - AN-604 Analog
Devices App Note - …
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AN752: AN752 CRC Algorithm for Mcrf45x Read/Write Device__ - Microchip Application Note Published 15-Mar-01 …
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AN788:
Numerical Integration Techniques TC7109__ -
Microchip Application Note Published 12-Nov-02 …
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Basic logarithmic Amplifier using op-amp and NPN transistor__ - …
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Battery Charge Current
Indicator__ - This circuit turns on a LED
whenever it detects at least 25ma of battery charge current . . . [Circuit by David Johnson P.E.,
07/23/06]
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Bodmas Rule__ - The term 'BODMAS' is an acronym for 'bracket,' 'of', 'division,' 'multiplication,'
'addition' and 'subtraction' and the 'BODMAS rule' is a mnemonic for the hierarchy of various
arithmetical operators. A mathematical expression may involve a number of operators, but only one of them
must be carried out first. The order of priority, as we are familiar from school days, follows: 'Bracket'
followed by 'of,' 'division,' 'multiplication,' 'addition' and then 'subtraction' in that order. … [© EFY
Enterprises Pvt. Ltd. All rights reserved.] |