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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
Fast-settling picoammeter handles wide voltage range
09/14/06 EDN-Design Ideas Versatile circuit converts picoamperes to millivolts Design by Rob Whitehouse, Analog Devices, Wilmington, MA
Fax to Modem Interface
The circuit can be easily built to a small plastic box with telephone connectors in both ends. The circuit takes about 10-20 mA current, so if the circuit is not in use all the time it is best to use batteries. You can also use small wall transformer to power the circuit. Remeber to take a wall transformer which gives good quality output (regulated model preferred) , __ Designed by Tomi Engdahl
Filter Solutions
PC windows based filter synthesis and analysis software. __ Designed by Tony van Roon VA3AVR
Finding Transistor Pins
Use a cheap needle multimeter to find transistor pins. __ Designed by Wichit Sirichote
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
Firmware Based Protocol for Low Priority Data Transfer
The DS protocol was designed to provide firmware-based bidirectional host-to-slave inter processor communications for situations in which no hardware solution is available and the host and/or the slave in incapable of tending the interface in real time. The only specialized hardware required is two bidirectional I/O ports on each chip (alternatively two input ports and two tri-statable output ports may be used). __ Designed by Dick Cappels
First steps with the PIC32 Ethernet Starter Kit
Add ethernet connectivity your projects, get started with the Microchip Ethernet Starter Kit quickly. This guide shows how to setup the MPLABX development environment for compiling PIC32 source code and the TCP/IP stack __ Designed by Peter Jakab
First Z80 CPU system
My First Z80 CPU system __ Designed by Thomas Scherrer OZ2CPU
Fixture Determines Leakage of Capacitors & Semiconductor Switches
06/06/07 EDN-Design Ideas The low input-bias current of a voltage-follower op amp allows this simple fixture to measure the leakage current of capacitors and reverse-biased active devices. Design by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia
FM Beacon Transmitter (88-108 MHz)
This circuit will transmit a continuous audio tone on the FM broadcast band (88-108 MHz) which could used for remote control or security purposes. Circuit draws about30 mA from a 6-9 volt battery and can be received to about100 yards. __ Designed by Bill Bowden
FM radio for a PIC (uses TDA7000 IC which is noW obsolete)
Scchematic only __ Designed by Kyriakos Kontakos
Force/sense connection eliminates multiplexer on-resistance error
22-Jan-04 EDN-Design Ideas Digitally controlled gain is an everyday analog-design element. You frequently find this element in an op-amp-based, transimpedance current-to-voltage converter. When you design digital gain control into such a converter, the usual scheme is to arrange things such that a digital multiplexer selects the appropriate feedback resistor for each gain figure Design by Stephen Woodward, Marine Sciences, Chapel Hill, NC
FPGA Emulates 74X74 Flip-Flop
10/12/95 EDN-Design Ideas The Xilinx 4000 Series FPGA library contains a D-type flip-flop with either asynchronous preset or clear, but not both. The circuit in Fig 1 provIdeas both functions, thereby eliminating the need to use discrete 74X74 ICs. The circuit consists of a set flip-flops, two reset flip-flops, a 4:1 multiplexer(of which you use only two channels], and a few logic gates. If either PR Design by Keith Gomarac, AIL Systems, Lancaster, CA
FPGA implements X.50 Division 3 recommendation
04/13/00 EDN-Design Ideas The scheme in Figure 1a uses five delay cells and an XOR gate to configure the data stream for the X.50 Division 3 recommendation of ITU-T. The X.50 recommendation defines the fundamental parameters of a multiplexing scheme for interworking data Design by Andres Martinez, Alcatel, Ramirez de Prado, Spain
Frequency dithering enhances high-performance ADCs
08/18/05 EDN-Design Ideas Modification of dithering principle respects A/D characteristics Design by Steve Hageman, Windsor, CA
FSK Modem with PIC16C84
schematic only __ Designed by shaunwilson19 @ yahoo.com
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
FT232 USB Interface Adapter
Control up to three devices from a PC with FT232 IC (USB to Serial UART) from Future Technology Devices International FTDI. Circuit is simple and does not require external microcontroller or any type of firmware programming. PC control software written in VB6 is included.
Gal Programmer
This is a simple GAL programmer that can be controlled with PC's parallel port. Its supported devices are Lattice GAL16V8/20V8/22V10 and versions of A through D. Now added a new function of PIC programmer. __ Designed by The Electronic Lives Manufacturing-presented Chan
Game Boy Camera PC Serial Interface
The results of their conversion are seen in Figure 2, which was obtained using the supplied evaluation software. The supplied evaluation software can also be used to view FFT data (Figure 3) as well as a histogram for codes at a fixed dc level (Figure 4)
Game boy camera PC serial interface
The results of their conversion are seen in Figure 2, which was obtained using the supplied evaluation software. The supplied evaluation software can also be used to view FFT data (Figure 3) as well as a histogram for codes at a fixed dc level (Figure 4)
Gbytes squeeze onto 3-in. disk drive
11/21/96 EDN-Design Feature Intégral just became the second disk-drive vendor to announce support for the 3-in. disk-drive form factor that JTS Corp (San Jose, CA) champions. The companies claim that the added disk surface area available on 3-in. media makes the drives a superior price/capacity choice to 2.5-in. drives for applications such as notebook computers (see "Disk drives at 40: lean, mean storage machines," EDN, Nov 7, 1996, pg 51). Design by Maury Wright Intégral Peripherals Inc, Boulder, CO
General-Purpose Components Implement USB-Based Data-Acquisition System
26-Jun-08 EDN-Design Ideas A serial ADC communicates with a PC's USB port through a serial-to-parallel converter and a USB-interface IC Design by V Gopalakrishnan, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
Get Four Colors from 2 Bits
08/12/10 EDN-Design Ideas Using a three-color LED, you can get red, green, blue, and mixtures such as white light. Design by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia
Get just enough boost voltage
27-May-04 EDN-Design Ideas Adding a current-mirror circuit to a typical boost circuit allows you to select the amount of boost voltage and to ensure a constant difference between the input and the output voltages(Figure 1). This circuit is useful for high-side-drive applications, in which a simple voltage doubler is unacceptable because of the voltage range of the components involved or where the input voltage can vary Design by Kieran O'Malley, On Semiconductor, East Greenwich, RI
Get Power Out of PC Parallel Port
An article which includes circuits, shares how to us a parallel port to connect to a very wide selection of devices like software protection dongles, removable disks, modems, network adapters, printer sharing units, parallel port extenders, soundcards, electronic telecard readers and many circuits. __ Designed by Tomi Engdahl
Get Power Out of PC Parallel Port
This text tries to clear out the mystery of how to get power out of PC serial power. There are quite many small circuit which take all their operating power from serial port, where there are no real power output pin. Examples for this type of circuits are PC mouse and software protection dongle. You might wonder how this is possible. __ Designed by Tomi Engdahl
Get power out of PC RS-232 port
An article which includes circuits, shares how to us a parallel port to connect to a very wide selection of devices like software protection dongles, removable disks, modems, network adapters, printer sharing units, parallel port extenders, soundcards, electronic telecard readers and many circuits. __ Designed by Tomi Engdahl
Getting the Internet on His Watch
23-Feb-04 -Design News: When he found a bunch of surplus miniature, alphanumeric LED displays, he knew he had the makings of a watch-but how far to go? Adding a barometer, altimeter, and temperature sensor makes it a perfect outdoor accessory. The coup de grace is the Trippy Bits / four letter word function-random bits __ Gadget Freak
Gold Wafer Smartcard Programmer
Using the software CHIP-CAT 2.0, the flash and the external EEprom of various smrartcards can be written. __ Designed by Mail @ MAKInterface.de
GPS receiver (Gamin, Eagle etc) to PC interface cables
GPSy (TM) has extensive documentation on how to create your own data cables, and if you are handy with a soldering iron (or know how to use crimp connectors) , there are some instructions. __ Designed by © Global Mapping Systems and Karen Nakamura
Graphical Alarm Clock
(Below is a video of some of the features of the clock. Portions of the video are a little blurry, but that is due to the web cam and not the display of the clock) Launch in external player Why build the electronics of a clock? Well,
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
Greek telecard reader
This telecard reader can read the contain of any telecard until 64 bytes (512 bits) and display it to hyper terminal software, using RS232 port __ Designed by © Vassilis Serasidis
Ground-free DVM Module Supply from 5 V
NOTE
: Must register on this site __ Designed by Published in Elecktor July/Aug, 2010
Group Delay Equalizer has Gain More than One
10/12/95 EDN-Design Ideas For numerous applications, flat group delay (linear phase) is necessary to maintain system performance. The common group-delay equalizer of Fig 1a has unity gain and is a popular way to equalize data filters or alias filters when phase compensation is necessary. The alternative equalizer of Fig 1b, however, can provide a gain greater than one for systems that require additional gain (and when providing that gain elsewhere is impossible or impractical). Design by Mark Weigel, Scottsdale, AZ
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