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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:

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

Interfacing 5 Volt CMOS to 12 Volt loads -  The circuit above is designed to be used with the bi-directional lamp sequencer shown above on this same page.  Two additional transistors are used to increase the current from the 74HCT138 decoder to control 12 volt 25 watt lamps.  A 6.8 volt/1 watt zener diode is used in series with the ground connection of all the CMOS ICs (74HC14, CD4516 and 74HC138s) so that the total voltage across the CMOS devices will be about 5.2 volts and the outputs will move from +12 to about +7 when selected.  The 2N2905/PNP transistor stage is connected as an emitter follower which provides a high impedance to the __ Designed by Bill Bowden

Interfacing a 4X4 Keypad to a BS2 using a 74922 Encoder Chip -  This is a pretty basic project, I had a little trouble understanding how the 74922 worked but I after an hour or so of looking at the data sheet and using my logic probe I understood completely.  Here is a brief description of how the 74922 works.  The chip scans the keypad waiting for a keypress.  When a button is pressed pin 11 of the 74922 goes high.  Then a 4 bit binary number corresponding to the button press is sent to pins 14-17 of the IC __ Designed by shaunwilson19 @ yahoo.com

Interfacing a DSLR Hotshoe to an Arduino -  While the suggested optocoupler is certainly a safe thing to try you may find it doesn't work.  Traditionally SLR hot shoes were a simple switch to fire the flash and while modern DSLR systems no longer use the high voltages that some older flashes presented to the camera many use a transistor to pull the line to ground.

Interfacing PC sound card to SSB rig -  AN047-P:  Interface - LVDS: 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

Interfacing to Microprocessor Based 5V Systems -  AN50 Linear Technology This App Note discusses a variety of approaches for interfacing analog signals to 5V powered systems.  Synthesizing a "rail-to-rail" op amp and scaling techniques for A/D converters are covered.  A voltage-to-frequency converter, applicable where high resolution is required, is also presented.  __ Linear Technology/Analog Devices

Internal Debuggers Simplify P PC-Board Verification -  05/12/94 EDN-Design Ideas - When you must keep the cost of a design to a minimum, try using Ps having background- debug mode, which reduces parts count, lowers board cost, and improves reliability.  Until recently, engineers have lived with a basic limitation of P-board design: the inability to inspect or directly control the internal workings of the actual P.  This limitation was especially irritating when the core system crashed, rendering onboard diagnostic software unusable.    __ Circuit Design by Jim Hebert, Tektronix Inc

Introduction to 74HC595 shift register-Controlling 16 LEDs -  This tutorial shows you how to control 16 LEDs with just 3 control lines.  We do this by daisy chaining 74HC595 shift registers The 74HC595 shift register has an 8 bit storage register and an 8 bit shift register.  Data is written to the shift

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 Monat - Mesa Arizona

IO Controller with serial Port CLI -  This code runs on a PIC 16F627A or 628A  (and A.  F.  A.  I.  K 627/628 parts) .  It uses the serial USART on the PIC to communicate with a PC.  Through this a simple CLI  (Command Line Interface) is implemented that allows commands to be sent to the PIC to control output lines and read and return the status of inputs on the PIC.  The serial interface is configured to operate at 9600bps, 

iPod / USB MP3 charger using MC34063 switchmode regulator -  Schematic Only

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

IR RC5 Remote Control Transmitter -  All remote controlled projects from this site can be controlled with remote controls which use the RC5 protocol, like the TV-remotes from Philips.  When all buttons from such a remote are in use then you could make a remote control by yourself.  Your own build remote control with only one button or maybe you want to build a remote with more than hundred buttons.  It is possible, however, you need the PIC Basic compiler from Crownhill seeing that everyone has his own wishes and you have to fill in which button sends which RC5 code.  

IR Remote Control Repeater -  This circuit receives the signal from a IR remote control, like those used to control your TV or DVD player and allows the signal to be repeated in another location.  Having built a version of this using a 555 timer from a circuit I found on the web  (see here) I thought maybe I could use a PIC

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 Monat - Mesa 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 Monat-Mesa Arizona

IR USB on PIC18F2550 -  A IR remote - USB keyboard for XBMC Hi, i'm sharing this project becuse it has become realy useful for me.   (and it was easy and fun to build) .  And like i was not able to find some project that do this  (now i have found some) i had to __ Designed by Arthur Benemann

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 Musicolour - or 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 Monat - Mesa Arizona

Isolated RS232 for PIC16F84 -  Connect serial transmit bit of the transformerless supply PIC16F84 circuit with COM1 through the use of isolation device.  Protect your notebook from direct connected to power line.   __ Designed by Wichit Sirichote

ISP Flash Programmer V3.0a -  Flash programmer using ISP designed by M Asim Khan for AVR and 89Sxx series.  Updated software!  (recommended for applications)  __ Designed by Wichit Sirichote

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

JDM PIC & EEPROM programmer -  This is a JENS MADSEN 'S project I've built to program my pic and EEPROM  (16xXXX AND 12CXXX AND 24CXX) I use it with ic-prog , it is little , simply to build , cheap and give few bugs, When I built it , At first it seems not to work properly  (read but not write) then I made the following mod to the schematic: added a 1 k resistor in series on rts line and now everything is ok.  !  __ Designed by Alfred73

JDM PIC Programmer -  Allows to program PIC16F84, PIC16F628, PIC16F877, etc 

JDM Programmer -  Schematic Only __ Designed by Peter Averill

JDM Programmer Modification -  The JDM  (or Ludipipo) seems to be among the most popular PIC programmers used, and rightly so: it is simple, cheap and easy to build, can be run with the free and excellent IC Prog software by Bonny Gijzen, and will program pretty much any PIC microcontroller on the market.  However, an issue has arisen lately with some of the new PIC's, eg PIC12F675, 12F629, and some others with an internal oscillator.  When these chips are programmed the first time, everything goes fine.  However, if you later try to read or re-write to them, they read as blank and cannot be written to.  The problem only occurs when the PIC has been programmed for INTOSC and MCLR_OFF, but even in this situation sometimes it will re-program OK, there seems to be some other dependence on the program which has been loaded as well.  

Jupiter card programmer -  The original hardware and software PonyProg  (which can be used for Jupiter Card programmer II) is presented in Lanconelli Open Systems.  A SmartMouse oscillator is used insted of original circuit to prevent problems, which are announced by error message "Device missing or unknown device  (-24) ".  The serial port of PC is used for connection.  This programmer is compatible with so-called "Harpune" programmer

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

Key-Reading Saves I/O Pins -  6-Mar-03 EDN-Design Ideas - Amplifiers perform precision divide-by-2 circuit - Some 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

KL5C8012 board -  This is a microcomputer board used Kawasaki Sleel KL5C8012.  KL5C8012 is a very fast KC80 cored one chip microcontroller.  KC80 is a Z80 compatible MPU core that four times faster than Z80 on same clock frequency.   __ Designed by The Electronic Lives Manufacturing-presented Chan

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


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