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Digital  / Logic Circuits 
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Last Updated on: Wednesday, November 29, 2017 05:38 AM

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Quadrature Direct Fourier Transform - PIC Project  Disclaimer:  I don't know whether this idea is original, I only know that it works. Normally, doing DFT (direct fourier transform) means multiplying each data point with the sine and cosine coefficients and then summing the totals for all points. The resultant sums are then 'vector added' by taking the 'square root of the sum of the squares'. . . [Luhan Monat - Mesa Arizona]

 

Quadrature Signal Interface to a COP400 MicroController - Application Note   [National Semiconductor]

 

Quiet FCT Logic Advances replacement for ABT Logic - Application Brief # 003  [Pericom Semiconductor] 

R/C Digital Camera Controller - My personal experience with R/C airborne video is focused on wireless video systems that transmit realtime images. However, airborne still photography is quickly becoming a popular alternative, especially since it avoids all the FCC/ham license issues. And the new mega-pixel digital cameras are low cost and are surprisingly small. Nearly any model aircraft can haul one around. . . [RC-CAM by T. Black]

 

Radiation Design Considerations using CMOS Logic - Application Note. . . [National Semiconductor]

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Random Numbers - PIC Project  Many random number generators are software versions of the hardware shift register feedback circuit. Two problems with this approach are that this operation is usually clumsy in software and the results have some noticeable patterns. . . [Luhan Monat - Mesa Arizona]

 

Random-Bit-Sequence Generator - 05/10/01  EDN Design Idea   A random-bit-sequence generator is basic equipment for prototyping and testing any data-transmission system. You use such a generator when measuring BER (bit-error rate) and pattern-dependent effects in a transmission system. Such effects can include base. . . [by Przemyslaw Krehlik]

 

Random-Number Generator Prefers Imperfect Clock - 11/21/96  EDN Design Idea   The circuit in Figure 1 generates random numbers using a linear-feedback shift register (LFSR). The 16-bit LFSR consists of two shift registers, IC3 and IC4, and the feedback circuitry comprising IC5A, IC6A, and IC6B. The CLK2 signal clocks the output of. . . [by Sergey Velichko, SCP Global Technologies, Boise, ID]

 

Rapid Prototyping Methods for Embedded System Development - Application Note. . . [Agilent]

 

Rapid Prototyping Speeds Development of UMTS W-CDMA Algorithms - Application Note. . . [Agilent]

 

Ratiometric Sensing using the PIC16C774 - Application Note Published 4-Apr-00. . . [Microchip]

 

RC Controlled Digital Camera - The aim of this project was to get a digital camera into a small electric radio controlled (RC) airplane and still have it fly. The airplane shown, a park flyer, weighs between 400 and 550 grams depending on the size of battery and wing configuration that I use. . . [Electronic communications to r dot p at webone.com.au]

 

RDS Encoder-Digital part - . . .

 

Reading Data from the Parallel Port - . . . [Bill Bowden, designer]

 

Real-Time Operating System for PIC16/17 - Application Note Published 7-Jan-00. . . [Microchip]

 

Reducing Noise on Microcomputer Buses - Application Note. . . [National Semiconductor]

 

Reflective Object Sensor Works In Bright Areas - 07/29/10 EDN Design Idea   Digital logic lets you accurately detect a passing object, even under a bright light. . . [by Vladimir Rentyuk, Modul-98 Ltd, Zaporozhye, Ukraine]

 

Relative-Humidity Transmitter uses Single Logic IC - 11/08/01  EDN Design Idea   The low-cost percentage-relative-humidity radio transmitter in Figure 1 operates in a cold-storage warehouse for vegetable storage at temperatures of 1 to 5°C. It is generally difficult to collect such data from a low-temperature ar. . . [by Shyam Tiwari, Sensors Technology Ltd, Gwalior, India]

 

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