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Microprocessor Circuits
Microprocessors:  #'s - B      C - F      G - K      L - M      N - P      Q - S      T - Z


Last Updated: October 24, 2017 02:55 PM

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

Updating the PIC Programmer & Checkerboard -  Here's how to use it with Windows 2000/XP and PCs running faster than 1GHz.__ SiliconChip

UPG2301TQ Application Information 8/1/04  -  App Note  Doc #958__ California Eastern Laboratories

Upgraded Software for the EPROM Programmer -  It fixes the bugs and can be downloaded from our website.__ SiliconChip

Upgrading an Ultra-LD Mk.2 Amplifier to Mk.3 Standard -  This teensy PCB lets you add the vital modifications to an Ultra-LD Mk.2 amplifier to bring it up to Mk.3 performance.  We are doing this so that all those people who built the Ultra-LD Mk.2 from the August-September 2008 issues will not be too annoyed with us for superseding it with the Mk.3 version.  After all, we want to keep our readers happy and content!__ SiliconChip

USB & GLCD Expansion Board for 8051SBC -  Simple circuit for USB and 128x64 GLDC interface.   __ Designed by Wichit Sirichote

USB AVR In-System-Programmer -  USB AVR programmer that supports a lot of AVR microcontrollers  __ Designed by Klaus Leidinger , Dimitris Porlidas , Mike Henning andVassilis Serasidis on ©

USB Clock with LCD Readout, Pt.1 -  This LCD USB Clock connects to your PC's USB port.  It synchronises its time with your PC - and ultimately an internet time server - when your PC is on to maintain accurate time-keeping.  It can also operate on its own using battery back-up and has user-selectable display modes.__ SiliconChip

USB Clock with LCD Readout, Pt.2 -  Last month, we detailed the circuit of the USB Clock and showed you how to build it.  This month, we detail the software installation and describe how it is used.  We also describe how to synchronise your PC to an internet time server and how to synchronise the USB Clock to the PC each time the PC boots up.__ SiliconChip

USB interface for parallel LCDs -  Adding a cheap LCD to your PC is a popular diy project for many beginners in electronics.  The parallel port however, is dead.  It's obsolete.  It's big.  ugly and just awful.  The solution? Add a USB interface to your existing LCDs.  The circuit __ Designed by Radio LocMan

USB PIC Programmer (Brenner8) -  Program PICs through your USB port!

USB Power Injector for External Hard Drives -  A portable USB hard drive is a great way to back up data but what if your USB ports are unable to supply enough "juice" to power the drive? A modified version of the SILICON CHIP USB Power Injector is the answer.__ SiliconChip

USB Printer Share Switch -  This simple device allows two computers to share a single USB printer or some other USB device, such as an external flash drive, memory card reader or scanner.  A rotary switch selects the PC that you wish to use with the USB device, while two LEDs indicate the selected PC.__ SiliconChip

USB Stereo Recording & Playback Interface -  Now you can use your laptop PC to make high-quality stereo audio recordings with professional standard balanced microphones.  This interface unit lets you make recordings at sampling rates up to 48 kilosamples/second and provides high-quality stereo analog line outputs for playback or monitoring.  There's also an S/PDIF digital audio input for recording and an S/PDIF digital audio output for playback.__ SiliconChip

USB switch -  You can connect one USB device like a printer or scanner on 2 computers and controlled by software __ Designed by © Vassilis Serasidis

USB Test Instrument Interface for PCs -  With this USB interface you can turn your desktop or laptop PC into a whole suite of test instruments - a 2-channel digital scope, spectrum analyser, AC DMM and frequency counter plus a 2-channel audio signal/function/arbitrary waveform generator.  Interested? Read on.__ SiliconChip

Use 8051's power down-mode to the fullest -  07/06/00 EDN-Design Ideas - The 8051 series µCs offer idle and power-down modes, both of which you invoke by setting appropriate control bits from the code.  For instance, a 5V, 12-MHz Atmel AT89C2051 consumes approximately 9 mA in active mode, 1.8 mA in idle mode, and only 12 µA in power-down mode.  Although power-down savings outperform those of the idle mode by two orders of magnitude, the __ Circuit Design by Jerzy Chrzaszcz, Warsaw University of Technology, Poland

Use a microcontroller to Design a boost converter -  4-Mar-04 EDN-Design Ideas - Boost converters, like other switchers, have traditionally received their control signals from a dedicated circuit.  However, a recent trend is to integrate simple switching-power-supply building blocks into generic devices, such as microcontrollers.  An excellent example of this concept is a microcontroller that combines digital and analog circuitry and makes it easier to build simple power supp __ Circuit Design by Ross Fosler, Microchip Technology, Chandler, AZ

Use Eight Timers with PIC16Fxxx Microcontrollers -  18-Feb-10 EDN-Design Ideas - Timers debounce switches and let you decide when lapses have expired __ Circuit Design by Luis G Uribe C, Caracas, Venezuela

Use the MCLR Pin as an Output with PIC Microcontrollers -  10-Jan-08 EDN-Design Ideas - Adding a MOSFET to a 6-pin microcontroller transforms its reset/programming pin into an output pin __ Circuit Design by Antonio Muńoz, Laboratorios Avanzados de Investigación, Huesca, Spain, and Pilar Molina, Universidad de Zaragoza, Zaragoza, Spain

Uses & Advantages of MERA Dual Matched MMIC Amplifiers -  AN-60032 Application Note__ MiniCircuits.com

Using 7-Segment Displays with the PICAXE Micro-Controller -  This program uses a 74C164 shift register to count from 0 to F  (HEX) on a 7 segment common anode LED display.  This operates much the same was earlier demos using the 74HC164 to simply count in binary on a row of eight LEDs.  The main objective is to explore code using several variations of the program.  We'll also make use of the PICAXE internal EEPROM to store the segment code. __ Designed by Lewis Loflin

Using a Wideband O2Sensor In Your Car, Pt.1 -  This Wideband Controller is intended to be used with a Bosch Wideband LSU4.2 oxygen sensor and our Wideband Sensor Display to accurately measure air/fuel ratios over a wide range from rich to lean.  It can be used for precise engine tuning and can be a permanent installation in the car or a temporary connection to the tailpipe of the exhaust.__ SiliconChip

Using a Wideband O2Sensor In Your Car, Pt.2 -  Last month, we introduced our new Wideband Oxygen Sensor Controller and described the circuit.  This month, we show you how to build it and give the test and installation details.__ SiliconChip

Using ADS1286 12-bit ADC with BASIC-52 -  ADS1286 is a nice little ADC with up to 20kHz sample rate, internal S&H circuit, and sucks up less than 500uA while operating  (only 3uA in shutdown) .  It comes in 8-pin DIP  (hobbyist friendly!) and SOIC packages and is very easy to use.  External VREF allows you to set appropriate input range for your application.  It is not very cheap, and only has one input  (although differential) but other than these, it is lovely.  As you can see from the schematics and sample code, it is both easy to hook up and easy to program for.  The sample below takes ADC readings and just prints them.  Run it and turn the pot, you should see the reading chage from almost 0 to almost 4096, with 5V VREF the output resolution is about 1.2mV. __ Designed by © Madis Kaal

Using an ADXL330 accelerometer with an AVR microcontroller -  The last decade has seen more than an order of magnitude drop in the price of
accelerometers, devices capable of measuring physical acceleration  (often in more than one direction) .  History suggests that whenever a useful technology makes a precipitous drop in price, unexpected applications follow, and that’s exactly what has happened in this case. __ Designed by Windell Oska

Using DS1302 timekeeper chip with BASIC-52 -  If run, this program reads RTC values in loop and displays current date and time.  However, before you can do that, you have to set the time in RTC, and enable it.  Modify values on lines 10010..10016, then enter GOTO 10000.  You will get C-STACK error because of bogus RETURN, but it does not matter.  You will probably want to enable the trickle charger for you backup power source by entering GOTO 5000. __ Designed by © Madis Kaal

Using DS1621 temperature sensor chip with BASIC-52 -  As you can see, hookup it pretty trivial.  So would be the code if BASIC-52 would have PORT3 access operator as for PORT1.  As I wanted to keep the PORT1 pins for DS1302 clock hookup, I decided to use T0 and T1 pins for I2C interface.  Dallas calls it 2-wire serial bus, but it is the same thing.  They probably just can't use I2C name or Philips will sue their heads off. __ Designed by © Madis Kaal

Using Easy-Downloader V1.1&V2.0 with Unsorted HEX Files -  Kurnia Wijaya from Jakarta Indonesia helps me writing the program that sorts the intel hex file generated by some compilers.   __ Designed by Wichit Sirichote

Using LM317 With Overvoltage Protection -  The circuit diagram shows the over voltage protection as a feature of LM317 linear voltage regulator.  Over voltages come from several source or factors which are usually in the form of transients.  Transients are represented in spikes which are short and fast disturbance or change in the voltage and current component.  It only occurs in

Using Multiple 34980A/ 34970A Mainframes for Faster Scanning -  Application Note__ Aligent

Using Offsets to Avoid False Triggers -  Application Note__ Aligent

Using RF Modules for wireless communication with BASIC-52 -   (Temperature logger) 

Using the 74HC165 Shift Register with the PICAXE Micro-Controller -  The object of this tutorial is to introduce the student and hobbyist to shift registers and using code with the PICAXE micro-controller.  We will also look at how to connect groups of 8 LEDs in both common anode/cathode configurations and how to switch them on/off as a group using external transistors. __ Designed by Lewis Loflin

Using the AT89C4051 as a RTC (Real-Time Clock) -  If you are looking for the simplest project, you are at the right place.  Its a digial clock which make use of AT89C4051 to work as a Real time clock.   __ Designed by Ajay Bhargav ajay_bhargav @ hotmail.com

Using the Catalog Specifications to Determine MMIC Reliability -  AN-60-030 Application Note__ MiniCircuits.com

Using the uIP Stack to Network a MAXQ MicroController  -  App Note 4205-- 3/25/2008 --  (add 5/08) __ Maxim Integrated

Using the Valve Preamp in a hifi systE - M -  Here's how to add a volume control and modify the November 2003 Valve Audio Preamplifier for use with line level signals.__ SiliconChip

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Microprocessors:  #'s - B      C - F      G - K      L - M      N - P      Q - S      T - Z


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