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Fast, compact routine interfaces EEPROM to µC - 03/04/99 EDN-Design Ideas - (Scroll to find this EDN Design Idea) Design by Grzegorz Mazur, Institute of Computer Science, Nowowiejska, Poland
FCTS Project - many projects listed. Explore the site to find one that works for your application. __ Designed by Leonid Sapozhnikov
FFT Made Easy - 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'. __ Designed by Luhan Monat, Mesa, AZ
FIFO Makes Cheap Waveform Generator - 12/21/95 EDN-Design Ideas The circuit in Figure 1 shows the basic configuration of a simple and inexpensive arbitrary waveform generator. IC1’s 82C54 produces the timebase for the wave table. This IC can generate a 152-Hz to 5-MHz clock under software co Design by Todd Williams, Napco Security Systems Amityville, NY
FIFO provides data-width conversion - 09/26/02 EDN-Design Ideas Many designs require FIFO elastic buffers to form a bridge between subsystems with different clock rates and access requirements. However, in some applications, you need FIFO buffers for data conversion. One example is the case in Design by David Lou, Ghent University, Ghent, Belgium
Finite State Machine Programmable Logic Controller - Finite State Machine based Programmable Logic Controller.7 Inputs 8 Outputs Simple IF/THEN/ELSE based compiler language generates direct EPROM files. __ Designed by David L. Jones
FIR filter scheme saves ROM storage space - 05/11/95 EDN-Design Ideas You can easily implement single-bit FIR filters using ROM look-up tables, which allows you to avoid costly multiplier accumulators. Unfortunately, as filter order increases, so does the size of the ROM. Fig 1 shows how you can reduce the storage requirement for larger-order filters. The following difference equation defines an N-tap FIR filter, where y (n) , x (n-m) , and h (m) are, respectively, the output sequence, the input sequence delayed by m samples, and the impulse response (coefficients) of the filter: Design by CA Jalaludeen, Defence R&D Organisation, Kochi, Kerala, India
Fixing Transformer Buzz In the Class-A Amplifier - Since the 20W Stereo Class-A amplifier was published in 2007, it has been widely acclaimed for its sound quality. But there has been a consistent niggle experienced by quite a few constructors ? low level buzz from the power transformer. We recently took a look at this problem and have come up with a cure.__ SiliconChip
Flash Based-Microcontroller Programmer-Atmel 8051 - The Atmel Flash devices are ideal for developing, since they can be reprogrammed easy and fast. If you need more code space for your application, particularly for developing 89Cxx projects with C language. Atmel offers a broad range of microcontrollers based on the 8051 architecture, with on-chip Flash program memory __ Designed by Wichit Sirichote
Flash Memory VPP Generator Reference Designs - DN97 Design Notes__ Linear Technology/Analog Devices
Flash Microcontroller Programmer-Atmel 89c Series - Build your own flexible & easy to built Atmel 89C series flash programmer __ Designed by M Asim Khan asimkhan @ sat.net.pk
Flash-Memory Modules Emulate Disk Drive - 09/01/94 EDN-Design Ideas Because more and more flash-memory modules look just like familiar disk drives to your system, designing in fast and rugged mass storage has never been simpler. Companies promoting the use of flash memory in mass-storage applications seem to have made an Design by Gary Legg, Executive Editor
Flying Saucer - This project was inspired by one of those solar powered lawn lights. I had taken the bottom off of one and hung it in a tree. A neighbor commented that it resembled a small flying saucer. Hmmmm. __ Designed by Luhan Monat, Mesa, AZ
Form Random-Bit-Sequence Generator - 05/10/01 EDN-Design Ideas 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 Design by Przemyslaw Krehlik
Four Decade Digital Counter Project - This project shows how to build a fast speed four decades counter with an amazing digital integrated circuit. the 4026 CMOS
IC. With this IC you save a lot of time and money building digital counter/divider projects. In electronics books you will find different pulse counter circuits; most of them using TTL logic (transistor-transistor logic) that need two IC's for driving a seven segment LED display, which require more troublesome wiring and a lot of time. __ Designed by braincambre500 @ yahoo.com
Four-Digit Alarm Control KeypA - D - Alarm Control Keypads: This Keypad is suitable for the Modular Burglar Alarm. However, it has other applications. Pressing a single key will energize the relay. Entering the Four-Digit code of your choice will de-energize it. __ Designed by Ron J.
Four-Digit Keypad Controlled Switch - Universal Keypad-Controlled Switches: This is a Universal version of the Four-Digit Alarm Control Keypad. I have modified the design to free up the relay contacts. This allows the circuit to operate as a general-purpose switch. I've used a SPCO/SPDT relaybut you can use a multi-pole relay if you wish. __ Designed by Ron J.
Fourth Generation of LCD Backlight Technology - AN65 Linear Technology This publication, LTC's fourth effort devoted to LCD backlighting in as many years, treatssubject comprehensively. The text considers lamps, display and layout induced losses, circuitry, efficiency related issues, optimization and measurement techniques. Twelve appended sections cover lamp types, mechanical design, electrical and photometric measurement, layout, circuitry and related topics. __ Linear Technology/Analog Devices
FSK Modulator Enables Data Transmission Over Low-Speed Link - 06/11/09 EDN-Design Ideas Send digital data over a low-speed link. FSK (frequency-shift keying) is a type of signal modulation for transmitting digital data over an analog communication link. An FSK modulator comprises a digitally controlled sine-wave generator whose frequency shifts between two predetermined frequencies in response to the two logic levels of the digital data. The circuit in Figure 1 generates a sine wave by continuously sampling a single sine cycle. The output of IC2A is proportional to the currents through R1, R2, and R3. These resistors connect together at one end to the inverting input of IC2A, which is biased at VCC/2. Design by Israel Schleicher, Prescott Valley AZ
Fuel Mixture Display for Cars, Pt 1 - Has digital readout and bargraph displays. A PIC microcontroller makes it a snack to build.__ SiliconChip
Fuel Mixture Display for Cars, Pt 2 - All the constuction details and calibration procedures.__ SiliconChip
Fun With the Arduino Inventor's Kit - 14-Sep-11 -Design News: Steve Ravet - blogger Steve Ravet follows up on his kids' experiences with the Arduino Inventor's Kit. __ Gadget Freak
Fun with the New PICAXE 14M! - There's a new kid on the block! He's from the rapidly-growing PICAXE family (now with 11 siblings!) and goes by the name of 14-M. If you're a PICAXE fan, Stan wants you to meet him 'cos he's really friendlyespecially if you already know his younger brother, 08-M!__ SiliconChip
Function Generator Sine / Triangle / Square / SaW / Burst Sweep Noise based on PIC16F870 - PIC Project Sine Triangle Square Saw Burst Sweep Noiseruns on a PIC16F870 __ Designed by Luhan Monat, Mesa, AZ
Furby Resurrection - PIC Project There are several websites documenting the original Furby circuit board. I decided to replace the original circuit entirely and replace it with a PIC based controller. __ Designed by Luhan Monat, Mesa, AZ
Getting going with BASIC stamp - Our experimenter's board makes it easy__ SiliconChip
Good IR Detector - How to build a simple IR detector, schematics and alternate links __ Designed by DC Reagan
Graphics Controller Handles Interleaved Memory - 02/16/95 EDN-Design Ideas The Intel 82786 graphics controller does not generate a proper data-transfer cycle if your video RAM (VRAM) is organized into two interleaved banks (Fig 1) . The circuit in Fig 2 overcomes this device's deficiency. Design by YS Tam, Canadian Marconi Co, Kanata, ON, Canada
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