40 MHz Programmable Video Op Amp:  National Semiconductor Application Note 04 Nov1995 / (Circuit / schematic design added 6/06)

ActiveX control brings bit Manipulation to Windows:  05/25/00 EDN-Design Ideas / (added 11/05)

AN-614: AN-614 COMBO II Programmable PCM CODEC/Filter Family Application Guide:  National Semiconductor - Application Note   (added 2/06)

App Note 7 - Programmable Power Supplies:  Apex Microtechnology Corp - App Note - (Circuit / schematic design added 6/06)

Assembly code reads IDE-drive parameters:  05/09/96 EDN-Design Ideas / (added 11/05) 

Autoranging circuit simplifies hardware and software:  07/22/99 EDN Design Ideas  / (added 11/05) A natural approach to autoranging is to use an inverting op amp and switch in one of N feedback resistors at a time for a gain of A=-RF/RO (Figure 1). However, the inverting configuration suffers from low input impedance of ZIN=RO because the negative input is at virtual ground. Also, another inverter is necessary to provide positive voltage ranges because of positive signals at the input....

Binary Coded Decimal (BCD) Clock:  (added 11/05)

Bridge-temperature measurement Allows software compensation:  08/17/00 EDN-Design Ideas  / (added 11/05)   

C function turns PC into serial-bus master:  09/02/96 EDN-Design Ideas  /  (added 11/05)

C Program Calculates checksums:  02/15/00 EDN-Design Ideas  / (added 11/05)

C Program simulates industrial temperature system:  11/10/94 EDN Design Ideas /  (added 11/05)

C routine detects single high bits:  07/04/96 EDN-Design Ideas / (added 11/05)  Sometimes, you need to be able to verify the existence of just one high bit in a word. This ability can be useful, for example, to verify whether just one bit in a mask of mutually exclusive flags is set or if an incongruence exists in a word representing a set of input contacts. The most obvious way to implement this verification is to use a loop and a counter. You test the bits in a word one at a time and increment the counter when you find a high bit. The following listing shows a C routine for the verification function:....

C routine speeds decimal to binary conversion:  11/24/99 EDN Design Ideas /  (added 11/05)

Circuit measures software execution time:  03/17/94 EDN Design Ideas /  (added 11/05)

COMBO II Programmable PCM CODEC/Filter Family Application Guide:  National Semiconductor - Application Note   (added 2/06)

Connect a modem to a Basic Stamp:  09/16/99 EDN Design Ideas  /  (added 11/05) 

Embedded memory enhances Programmable logic for complex designs:  11/07/96 EDN-Design Feature / (Circuit / schematic design added 6/06)   The growing densities of PLDs are making the chips suitable for increasingly complex designs. Those designs require high-performance scratchpad RAM for temporary storage of data that passes through the logic circuitry that the chips implement. Vendors are responding with new devices.—Rick Nelson, Contributing Editor

Full wave rectifier has Programmable gain:  11/09/00 EDN Design Ideas /  (added 11/05)

Infrared Interface with Windows CD Software:  use infrared technology to remotely control a CD-ROM drive with an audio CD (added 11/05)

Lattice Semi GDS Chip Programmer software:  Generic Digital Switches are in-circuit programmable devices made by Lattice Semiconductor that allow pin to pin routing, buffering, and inversion. Perfect for making last minute circuit changes…. (added 11/05)

LED Driver provides software Controlled intensity:  09/30/04 EDN Design Ideas  /  (added 11/05)  Recent advances in operating efficiency have expanded the use of LEDs from one of mere indicators to becoming driving forces in electronic lighting. Increased reliability and ruggedness (versus other lighting technologies) gives the LED a bright future indeed. Vendors in recent years have introduced many ICs for driving LEDs, but the problem of driving serial chains of LEDs has received less at......

Make a Printer Port EEPROM Programmer and Dongle:  05/13/04 EDN Design Ideas  /  (added 1/05)  You can easily use a PC's printer port for serial-EEPROM programming. You can use a device-programmer circuit used to program the MicroWire serial EE-PROM 93CXX (Figure 1). The circuit is so simple that any further simplification seems impossible. This programmer circuit contains no microcontroller, as most device programmers do....

PC Serial and Parallel Port Software and Interfaces:   (added 11/05)

PIC16F84 Programmer #1:   (added 11/05)

PLD code creates PWM generators:  08/08/02 EDN Design Ideas  /   (added 11/05)  The PLD (programmable-logic-device) code in Listing 1 creates arbitrary-resolution, pulse-width-modulated (PWM) generators. PWM generators are useful as low-bandwidth D/A converters in hardware of microprocessor-based systems. When you pass it through a simple RC lowpass filter, a PWM waveform becomes a voltage that's approximately equal to the PWM duty cycle times the supply voltage....

Precision Current source is software Programmable:  12/17/04 EDN Design Ideas  /   (added 11/05)  With the addition of a few inexpensive miniature components, the hard-wired, voltage-controlled current source of yesterday becomes a software-programmable voltage-controlled current source (Figure 1). A digital potentiometer, IC1 in conjunction with a precision op amp, IC2, sets current through a pass transistor, ISET, and a shunt regulator, IC3, provides a constant reference voltage across ......

Program Converts hex to floating point:  07/20/95 EDN-Design Ideas / (added 11/05)

Program Converts temperature from RTD sensor:  06/05/97 EDN-Design Ideas / (added 11/05)  

Program designs single supply op amp circuits:  10/26/95 EDN-Design Ideas / (added 11/05)