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Digital  / Logic Circuits 
Digital Circuits:   #'s - C       D - G       H - M       N - R       S - T       U - Z

Last Updated on: Thursday, November 30, 2017 04:23 PM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

In-Circuit PIC Loader (ISP Programmer) Over Parallel Port This loader connects the PC printer port and works with WinPic800.  The loader gets DC supply from application board and provides +12V for high voltage programming mode.  We can use it for programming many PIC chips easily.   __ Designed by Wichit Sirichote

Inductance & Q-Factor Meter, Pt.2 -  Second article has all the construction details.__ SiliconChip

Inductance & Q-Factor Meter; Part 1 -  Compact unit measures inductors from 200nH10mH, checks Q-factor from 1-120 and displays the results on an LCD__ SiliconChip

Industrial-Grade Digital Potentiometer -  09/20/01  EDN-Design Ideas Both ac and dc motors in modern industrial systems often receive their control from PLCs  (programmable-logic controllers] in a control room safely away from the process.  If an operator must manually set the motor speed while observi __ Circuit Design by Phill Leyva, Maxim Integrated Products, Sunnyvale, CA

Inexpensive logic controls stepper Motor -  EDN-Design Ideas March 26, 1998    [ NOTE : File has multiple design, scroll for this one.]  A number of sophisticated ICs for stepper-motor control are now available. However, the advanced features of these chips--self-clocking, high-current drive, and full-step, half-step, and direction control--are often unnecessary or remain unused. For a design that needs to control only the number of steps, drive speed, and direction, you can make a very simple and inexpensive driver using two low-level logic chips  (Figure 1) . __ Circuit Design by David Ellis, Ellis Lindauer, Pullman, WA

Inexpensive Relays Form Digital Potentiometer -  03/13/98 EDN-Design Ideas NOTE :  File contains many circuits, please scroll to find this one.  Build a digitally controlable isolated potentiometer that can tolerate voltages up to 60-Volt dc __ Circuit Design by Robert Perrin, Z-World, Davis, CA

Input Attenuator for the Digital Audio Millivoltmeter -  If you'd like to be able to use our Digital Audio Millivoltmeter to measure AC voltages up to 140V RMS, this add-on project is the answer.  It's a simple switched input divider which lets you add 40dB, 20dB or 0dB of attenuation ahead of the meter at the touch of a knob.__ SiliconChip

Installing a Free-Air Subwoofer In Your Car -  You dont need to take up lots of room with a big box; this uses the boot as the enclosure.  And it w__ SiliconChip

In-System programming adapter for Atmel AVR Microcontrollers -  A simple circuit to program almost any Atmel AVR microcontroller in-circuit.__ SiliconChip

Intelligent NiCad Battery Charger -  "Connect and Forget" unit fast charges 702-14.4V battery packs from power tools and model cars.  A PIC processor simplifies the circuit.__ SiliconChip

Intelligent Video Switcher -  Monitoring several cameras on one monitor is usually done in one of two ways:  divide the screen into sections and show them all at once, or time sequence the cameras onto the whole screen.   __ Designed by Luhan Monat-Mesa Arizona

Interface Cable for Casio Qv-200 Digital Camera -  Lose your cable? Build it yourself and save $29.  Fits many QV models __ Designed by Bob Blick

Interfacing PC Sound Card to SSB Rig -  AN047-P:  InterfaceLVDS: Interfacing LVDS to PECL; LVPECL; CML; RS-4422 ans Signal-ended Devices

Interfacing Sony Control Stick to Empeg -  After discovering that others had interfaced wired remote controls to their Empegs  (including Sony control sticks) I decided to try to do it with the fewest components possible.  You may find that there are too few, if your power is very noisy  (as can happen in a car environment) it may help to place a 0.1uF and/or 10uF capacitor before and/or after the voltage regulator.  At the moment I'm not using these but at this point I've only tested it on the bench, not in the car.  I'll update this web page after it's all installed. __ Designed by charlie @ armory.com

Interfacing the MAX187 to the TMS320C3X Evaluation Module -  App Note/ 313 / Dec-06__ Maxim Integrated

Interfacing the MAX195 ADC to the TMS320C3X Evaluation Module -  App Note/ 572 / Jan-07) __ Maxim Integrated

Interfacing the PIC16c508 -  Each of the output lines of a '508A microcontroller can deliver a maximum of 25mA.  
What does this mean?  It means any device connected to the line must take 25mA or less.  If it takes more than 25mA a buffer transistor  (also called an amplifying transistor) must be used and this will be discussed in a moment.
However, if it operates on less than 5v, and requires less than 25mA, a current-limiting resistor must be included. __ Designed by Prepared Colin Mitchell

Introduction to Rambus System Architecture -  Application Note__ Aligent

Intrusion Detector-Video -  This device uses a PIC16F819 and an LM339 to detect motion on a video signal.  The incoming video is 'clamped' using one section of the LM339, the sync tips are detected with another section, and a 3rd section can detect VBI or other data.   __ Designed by Luhan MonatMesa Arizona

IR Detector for Robot -  How to build a simple IR detector, schematics and alternate links  __ Designed by DC Reagan

IR Digital Thermostat for FAN -  This circuit measures temperature in Celsius scale and displays it on an alphanumeric LCD screen When temperature rise to 40 C an alarm is activated and at the same time a relay is also activated which drives a fan to keep the temperature at a level __ Contact: IQ Technologies

IR Security -  PIC Project  This unit uses one TSAL6100 IR/LED emitter from Digi-Key.  This IR diode has a narrow  (10 degree) radiation pattern at 940 NM.  It is driven via 2n2904 transistor for maximum current pulses.  The detector is a Vishay TSOP4838 38Khz integrated receiver module.  The 38Khz signal for the emitter is generated in software.   __ Designed by Luhan MonatMesa Arizona

IR Terminal, Remote -  This unit provide 2 way IR communications using a numeric keypad and an LCD display.  Data is sent and recieved in ASCII with no regard to what the data means to any particular device __ Designed by Luhan MonatMesa Arizona

IrDA Interface Board for the DSP Musicolour -  Most PCs and laptops now offer an IrDA interface to enable communication without any physical connection.  Now you can have the same facility for the DSP Musicolouror for virtually any other microcontroller project.__ SiliconChip

Isolated High-Current Adaptor for Scopes & DMMs -  If you want to measure and monitor mains current of up to 30A using your DMM or scope, this is the safe and easy solution.  It works just as well with DC and it has significantly better resolution and bandwidth than most clamp meters.__ SiliconChip

Isolated Probe -  PIC Project  Working on live telephone circuits can be a problem.  You just can't connect a normal scope probe to the circuit while it is tied to the phone line __ Designed by Luhan MonatMesa Arizona

Iterated-map creates chaos -  EDN-Design Ideas 07/13/2016    The chaotic circuit in This Design Idea can generate random numbers, demonstrate chaotic behaviour, and impress friends and colleagues __ Circuit Design by Lars Keuninckx

Java applet computes standard values -  08/17/98 EDN-Design Ideas NOTE :  File has several circuits, scroll to this one.  The Java applet in Listing 1 implements a standard-resistor value calculator in a form that is suitable for use on a Web page or an internal intranet.  Java solves the portability and platform-support problems of previously published Basic programs.  See Reference 1 to learn __ Circuit Design by Vance Campbell, Digital Radio Communications Corp, American Fork, UT

Jazzy Heart Electronic Jewellery -  Want to be the life of the party? Build the Jazzy Heart LED display!__ SiliconChip

Keyboard to Ascii Decoder -  Host to Keyboard Protocol is initiated by takingKBD data line low.  However to preventkeyboard from sending data atsame Time that you attempt to sendkeyboard data, it is common to takeKBD Clock line low for more than 60us.  This is more than one bit length.  nKBD data line is taken low, whileKBD clock line is released __ Designed by Craig Peacock

Keypad engine immobiliser -  There's no need for a hidden "kill" switch.__ SiliconChip

Key-Reading Saves I/O Pins -  6-Mar-03 EDN-Design Ideas Amplifiers perform precision divide-by-2 circuitSome microcontroller applications usually use too many I/O pins to read keys or onboard switches; in many cases, few pins remain available for other uses.  Some alternative ways to read keys yieldfree pins.  First, consider some ways to effect key reading.  Table 1 presents a comparison of four methods with references to circuit configurations (figures 1, 2, 3, and 4] __ Circuit Design by Gustavo Santaolalla, Digital Precision Systems, Buenos Aires, Argentina

Knock Detector for the Programmable Ignition  -  The Programmable Ignition System would not be complete without the addition of engine knock sensing.  This Knock Detector is useful for adjusting ignition timing maps and can also automatically retard the ignition timing if engine knock is detected.__ SiliconChip

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Digital or Logic Circuits:  #'s - C       D - G       H - M       N - R       S - T       U - Z


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