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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:

60 minute PIC Count Down Timer -  On this page, I will introduce the Count-down timer with PIC16F84A.  I am putting a count-down timer by the hardware on Electronic Circuits Application Garage.  The function of the timer is the same as it approximately.     (The stop switch is added) Because this unit was made compactly, the wiring of the back becomes quite complicated 

64pixels -  Want to express yourself the geeky way? Try this tiny display.  It can play small animations and scroll some text.  It consists only of a few parts and is easy to build.  With two AA batteries itll give you over two weeks of pixelfun __ Designed by Alexander Weber

65w Notebook Laptop Power Adapter -  Using TOP269EG off-line switcher IC,  (U1) , in a flyback configuration can be designed a very simple high efficiency notebok laptop power adapter.  TOP269EG IC has an integrated 725 V MOSFET and a multi-mode controller.  It regulates the output by adjusting the MOSFET duty cycle, based on the current fed into its CONTROL pin.This laptop power adapter

68000sbc -  Build a 32-bit computing power single board with 68HC000, 256kB SRAM, 256kB Flash, RTC, UART, and GPIO.   __ Designed by Wichit Sirichote

6802 Nano computer -  Back in 1993 I had some time to spare    (those were the days) , and I decided to build a small Single Board Computer.  This SBC was used to demonstrate the possibilities of such a small computer system here at the local computer club.  I also used it to do some experiments, e.  g.  with the IC bus.  On its own the 6802 Nano Computer is nothing special.  It contains only 3 IC's: Microprocessor 6802, I/O chip 6821 and EPROM 2732.  Together with one of my Eprom Simulators this system can become a very easy to use experimental micro computer.   __ Designed by 2005, San Bergmans, Oisterwijk, The Netherlands

68HC11 Function Generator -  This site contains complete schematics and code for a 68HC11 based frequency counter, square wave synthesizer, sine wave synthesizer, programmable filter, capacitance and inductance meter, with a digitalker speech synthesizer output.  Project specifications are given below __ Designed by Michael Ellis

68HC11 Instruction Halts External RC Clock -  04/27/95 EDN-Design Ideas - Using the circuit in Fig 1, a 68HC11 P's stop instruction can put the P's external RC-oscillator clock, as well as the P itself, into a low-power mode.  On receiving an interrupt, the P will exit the stop condition and enable the RC clock.  The RC clock, being a low-Q circuit, will start up immediately.  Crystal oscillators, on the other hand, can waste precious milliseconds coming up to speed and stabilizing __ Circuit Design by Allen Harstine, Micro Systems Engineering Inc, Lake Oswego, OR

68HC11 Read Encoder -  The encoder is connected to PORTA PA0 and PA1 --  The board must be in BOOTSTRAB MODE    (tested with Loggyboard)  __ Designed by Ludwig Orgler-Fachingenieur Elektrotechnik

68HC11 stepper Motor control -  Simple circuit with 16-pin Nitron chip 68HC908, easy analog setting, source code with ICC08.  New s-record for 8-pin 68HC908QT2! __ Designed by Ludwig Orgler-Fachingenieur Elektrotechnik

68HC11 Synthesizes Accurate Sine Wave -  09/02/96 EDN-Design Ideas - You can use a 68HC11 and a 12-bit serial DAC   (Figure 1) to generate accurate sine waves without using floating-point arithmetic.  Figure 2 shows a block diagram for this sine-wave generator.  You can easily analyze the generator's behavior by writing state equations in the z domain.  You can also write equations in the s domain.  The location of the two poles __ Circuit Design by Mika Maaspuro, Espoo, Finland

6-Decade Resistance Substitution Box -  Get a million resistance values with this __ SiliconChip

6-Digit Frequency Counter Module -  Low-cost unit measures frequencies up to 40MHz__ SiliconChip

75 LED Matrix using Arduino -  Presented here is a simple 7x5 LED matrix circuit vriven by Arduino Uno    (Arduino LED) .  It can be used to display your name or create any number of patterns.  If the...__ Electronics Projects for You

70-W S-Band Amplifier for MMDS & Wireless Data/Internet Applications 12/11/00  -  App Note 1038__ California Eastern Laboratories

8 Hints for Debugging Siemens MCU-based Designs -  Application Note__ Aligent

8 Hints for Solving Common Debugging Problems with Your Logic Analyzer -  Application Note__ Aligent

8 Switcher Powers High-Performance Ps -  04/13/95 EDN-Design Ideas - The circuit in Fig 1  delivers 8A for driving as many as two of today's high-performance, high-speed Ps.  You can also optimize the design for lower current by changing a few components.  Most systems use a low-current 12V bias supply and a poorly regulated high-current 5V to power the logic.  However, __ Circuit Design by Chester Simpson, National Semiconductor, Santa Clara, CA

8049 Spy -  What do you do when you have to read the internal ROM contents of a 8048 or 8049 processor and you don't own a programmer for those devices? You simply build this 8049 spy of course!  That is exactly what I did when I wanted to know how my Philips Frequency Counter PM 6668 worked.  With this knowledge I was able to add some interesting features to that beautiful counter.   __ Designed by 2005, San Bergmans, Oisterwijk, The Netherlands

8051 Development System Board -  This is the complete schematic for the development board.  Address and Data bus wires are drawn separately    (not in a bus) , so that it's easy to color over them on a printout, if you choose to manually connect the wires.  It really is easier to buy a bare circuit board, though. __ Designed by Paul Stoffregen

8051SBC V1.0 (Single Board Computer) -  I decided to rename C52EVBto be 8051SBC.  Since the cpu can be any 8051 compatible chips with 40-pinDIP package.  The old day chips, say 8031, 8751, 8032 or the new chips, 89C51, 89C52, 89C51RD2 can be used without any problem.  Some may thinkthat your old chips were useless, now you can use it for many projects.  The monitor program of new 8051SBC was placed at external 32kB EPROM __ Designed by Wichit Sirichote

8052 Development System Board #1 -  The address bus in this schematic is connected in an unusual way, which is optimized for simpler point-to-point wiring and board layout.  For anyone building the board using wire-wrap or hand soldered point to point construction, this wiring scheme makes for much less clutter in the wiring if the chips are positioned similarly to the layout on the printed circuit board.   __ Designed by Paul Stoffregen

8088 Maximum Mode SBC -  As an integral part of an advanced computer science course in microcomputer systems it was thought that students could benefit from the design of a single board computer system based on a readily available microprocessor.  This led to the project that is described in this paper.  Most of the actual design work was done by James Antonakos as part of an Independent Study project.  The result was a single board microcomputer system    (SBMCS) that requires only a power supply and a serial monitor to be fully functional.  This same project will be assigned to advanced undergraduate and intermediate graduate computer science students working in teams.  A photograph of the working single board microcomputer system that was designed and constructed is given in Figure 1.   __ Designed by Richard R. Eckert and James L. Antonakos

89C2051 microcontroller programmer -  HSETI1 PCB: An 89C2051 CPU, 8 driver ouputs    (e.  g.  LEDs, relays) , a speaker output, a light sensor input, 3 extra inputs, optional serial port, small simple PCB.  __ Airborn Electronics, Australia

89c2051proto Board -  This single sided proto board provides an economical solution for developing and testing the projects around Atmel 20 pin series u-controllers    (89Cx051 & AVR) .   __ Designed by Wichit Sirichote

89s52 Project Board -  Simple 89S52 board for student projects __ Designed by Wichit Sirichote

8-Bit Binary Counter -  Our binary COUNTER - B8 kit has many applications; Manual press the push button to count up to 2 ^ 8    (1 to 255 decimal) counts.  The binary counts will display on bright 8 LEDs! Automatic, short the switch to automatically count again and again.  Draw attention and have fun! The unique small design will allow you to mount it almost anywhere.  Simply connect the switch to your room door and you can count the number of time your brother "pick-in.  " Operate it with 9V battery, 12V car battery, four 1.5V batteries, or via one of our battery simulator kits __ Contact: Kit from Elich Industrial Development, Corp

8-Bit Generator & Display for Microcontroller -  For testing of microcontroller-based circuits, you need two test jigs: One for generating the desired bitstream to serve as the input to the device and the other to display the processed...__ Electronics Projects for You

8-Bit Microcontroller Implements Digital Lowpass Filter -  01/24/08  EDN-Design Ideas - A simple assembler routine fits a digital lowpass filter into a microcontroller __ Circuit Design by Abel Raynus, Armatron International, Malden, MA

8-pin C forms one-chip programmable VCO -  09/24/98 EDN-Design Ideas - NOTE :  multiple circuits, scoll to this one.  The circuit in Figure 1 uses a Microchip 8-pin C   (PIC12C671]as a voltage-controlled oscillator   (VCO].  Because  PIC12C671 has an internal 4-MHz oscillator, four-channel 8-bit A/D converters, and built-in power-reset circuitry, you need no external components to configure  VCO.  The C reads two analog inputs through AN0 and AN1 __ Circuit Design by Yongping Xia, Teldata Inc, Los Angeles, CA

8x8 Animated LED Signboard -  The firmware supplied incurrent sourcecode archive is VERY BASIC.  I do intend to draw more patterns.  However, a vast workload coupled with possible emigration has putfinished firmware on hold.  Please do go ahead and build this circuit thoughsupplied firmware is fully functional.  You can have hours of fun designing your own patterns and effects!UsesPIC16F84 __ Designed by Lewin A.R.W. Edwards

8x85 RGB POV Display. Part 1 -  Brads electronic projects This was my first attempt at a nice and colourful RGB LED POV Display.  POV stands for persistence of vision.  The circuit uses just 8 RGB LEDs which are mounted vertically and when spun horizontally it gives the illusion of __ Designed by Radio LocMan

8x85 RGB POV Display. Part 2 -  The drawing process is really quite simple.  The pic microcontroller puts 00000000 00000000 on the eeproms address bus    (selects the first address) This byte of info    (at that address) is now placed on the data bus and all RED GREEN AND BLUE __ Designed by Radio LocMan

8x85 RGB POV Display. Part 3 -  Things to note in the source code: You can easily define how many frames of animation are in your animation loop by changing the total_frames variable to how ever many frames you have.  The flying animation example has 178 frames.  If you only have __ Designed by Radio LocMan

90S2313 AVR Robot Board -  The Atmel AVR series are very good microcontrollers with quite a rich instruction set, rich enough that lots of folks have good compilers for them so we don't have to learn their assembler.  A very rich compiler available is the BASCOM/AVR compiler from MCS Electronics.  I've used this compiler for prototyping the software on my 90S2313 robot board for two reasons: One, It has a very rich command syntax; Two, its free in its demo version! The demo version only supports 2K of instruction memory, other than that it is completely uncrippled.  The 90S2313 has 2K of instruction memory - See the pattern? __ Designed by Dennis Clark

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


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