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

Last Updated: June 02, 2021 01:44 PM

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12 Amp, High Performance Microprocessor VID power supply (08 to 7 volt core voltage) - Many of the latest processors require a 2-level power supply voltage that must be dynamically switched.  A power supply that satisfies these requirements can be constructed using a DC/DC controller specifically designed for VID service.  However, substantial external circuitry is still required to make a functioning, reliable power supply.  Notebook computer manufacturers also prefer the VID feature because it provides the ability to change output voltages to support future processor core voltages __ Designed by Steve Hageman

12 Hour Clock - PIC16F84 based, four LED display segments, 12 hour clock

12 Volt Generation - PIC Project  The PWM output available from many PIC chips can be used to generate 12 volts.  This is very useful in making programmers for PICs that run on +5 volts only.   __ Designed by Luhan Monat - Mesa Arizona

12/24V AuxiliaryBattery Controller - Going bush in the 4WD or camper? Want to add a second battery for security and safety? Here's the safe way to do it.__ SiliconChip

12/24V MPPT Solar Charge Controller Rev.1 - Mix-It: An Easy-To Build 4-Channel Mixer__ SiliconChip

125 kHz RFID tag reader - This RFID reader is based on  a small 8 pin micro-controller    (ATtiny13) and an Operational Amplifier    (LM358) .  The reading-decoding and output the unique ID serial number of RFID tag is made entire in software by ATtiny13.  No special chip is used! __ Designed by © Vassilis Serasidis

12V 100W Converter with Adjustable 15-35V DC Output - Did you build the 12/24V 3-stage MPPT solar charge controller published in the February 2011 issue? Then you will probably want this companion 12V 100W inverter as well.  It will power laptops and other devices which require a DC voltage between 15V & 35V.__ SiliconChip

16 Bit PC Serial Port Receiver CMO - S - This circuit was designed to control a 32 channel Christmas light  show from the PC serial port.  Originally designed with TTL logic,  it has been simplified using CMOS circuits to reduce component  count.  It is a fairly simple, reliable circuit that requires only  4 common CMOS chips    (for 8 outputs) , an optical isolator, and a  few discrete components. __ Designed by Bill Bowden

1-I/O line drives shift register with strobe - 03/28/13  EDN-Design Ideas - This Design Idea shows how a single microcontroller port can drive a lot of output lines through shift register. by Zoran Mijanovic & Nedjeljko Lekic

2 channel RF remote control - This RF remote control it runs at 418 MHz frequency and support up to 2 channels.  It is very safety as the transmitting code is changing every time you push any button    (roll-code function)  __ Designed by © Vassilis Serasidis

2 channel RF remote control on AVR - How many times you needed some remote control to handle some electric device ? many times. There are lot of remote controls like infrared, RF, SMS  (like my other circuit) and more. The basic small-range remote controls are 2, Infrared and RF  (Radio Frequency) . One of the weaks of Infrared is that the signal can not pass the walls. So, if you want to control your garage door, the only way is to use some RF remote control. 

2 DDS ICs implement Amplitude shift keying - 12/25/03 EDN-Design Ideas - Many communications systems, including RFID systems and cable modems, use AM   (amplitude modulation].  This design idea shows how two DDS   (direct-digital-synthesis] devices can implement AM and ASK   (amplitude-shift keying] over a range of frequencies.  The AD9834 complete 50-MHz DDS IC   (Figure 1) has a current output, so you can easily sum the outputs of two orof them by connecting them to a Design by Noel McNamara, Analog Devices, Limerick, Ireland

2 gates & a microprocessor form digital PLL - 04/14/05 EDN-Design Ideas - Low-frequency PLL needs just a processor and gates Design by Kenneth Martin, TareTronics Inc, Corinth, MS

2 Gates Expand ASIC's Memory Decoding Range - 03/29/01 EDN-Design Ideas - Many electronic circuits implement chip-select lines on an ASIC.  From  beginning of  design cycle,  chip selects, CS0 to CS4, have defined bases on  memory map   (Figure 1) .  Adding functions Design by Vinh Hoang, Ericsson Inc, Brea, CA

2 PIC pins drive six LEDs - 06/09/14 EDN-Design Ideas - Here’s a take on LED multiplexing with minimal output pins.  This Design Idea demonstrates a new method of driving six LEDs with only two I/O lines from a microcontroller, and so is particularly suitable for any pin-limited chip.  It uses a pair of I/O lines combined with a pair of complementary bipolar transistors.   Design by Benabadji Noureddine

2 Way IR Terminal - 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

2.2-100V Zener Diode Tester - Got a bunch of unknown diodes and zener diodes? Check 'em all with this __ SiliconChip

2.4GHz Audio/Video Link - Maximum legal power easy to build fantastic range cheap ...__ SiliconChip

2.4GHz Wireless A-V Link - We've published a few audio/video transmitters/receivers over the years but none were as compact as this 2.4GHz model.  Whether you want it for legitimate security/monitoring applications or simply for fun, it's easy to build and a lot cheaper than buying a ready-made system!__ SiliconChip

2.5 GHz Frequency counter - This project describes a very powerful frequency counter.  Very simple construction which everyone can build.6 LED display will present the frequency with 1kHz resolution and RS232 communication to computer is available as option.  The software has also been implemented with some smart functions, for calculating frequencies in receivers where IF is 455kHz or 10.7MHz.  I present schematic, PCB, components and window software.  

240V Mains Filter for Hifi Systems - Get rid of clicks, pops, spruigles and sundry other noises in your hifi system.__ SiliconChip

2-chips simplify layout for high-end embedded control - 04/01/99 EDN-Design Ideas - NOTE :  File contains many designs.   Scroll to this one.   If you are considering using one of the 32- or 64-bit RISC µPs from Integrated Device Technology   (IDT], the company’s new RC32134 and RC64145 system-controller ICs   (Picture] can make your job easier.  The chips provide synchronous-DRAM, memory, and I/O control; a PCI interface; and peripherals, including UARTs, timers, and interrupt controllers.  The 32134 for the RC32364 µP provIdeas a glueless interface to DRAM Page includes several designs.   Design by Graham Prophet

2-Digit Counter - This article describes a 2-Digit Counter using a Microchip PIC12F629.  It shows what can be done with an 8-pin chip having just 5 output lines and one input line.  The chip drives two7-segment displays and this would normally require 7 lines to drive the segments plus another one or two lines to select the displays __ Designed by Collin Mitchell

32.768 kHz Oscillator using a Common Watch Crystal - Below are a couple circuits you can use to produce a 32.768 KHz square wave from a common watch crystal.  The output can be fed to a 15 stage binary counter to obtain a 1 second square wave.  The circuit on the left using the 4069 inverter is recommended over the transistor circuit and produces a better waveform.  The single transistor circuit __ Designed by Bill Bowden

3-wire serial LCD interface - If you are developing applications for the PIC mcu, and miss debugging tools, or don't have enough I/O pins for a parallel LCD interface in your design, this serial interface can help printing debug messages and/or reduce the pin count.  This version uses a Hitachi HD44780 compatible LCD module in 4-bit mode.  The interface is based on the idea of Myke Predko __ Designed by Peter Jakab

3-Wire Serial LCD using a Shift Register - HD44780 based character LCDs require at least 6 I/O lines from microcontroller to display data.  Therefore, they are not suitable for low-pin microcontrollers like PIC12F series microchips.  In this project, I am going to show how to __ Designed by Rajendra Bhatt

4 ICs implement video AGC & DC restore - 06/18/98 EDN-Design Ideas - Four ICs--a multiplier, a sync separator, an op amp, and a dc-restore IC--along with a handful of passive components can implement a complete AGC and dc-restore circuit for video signals   (Figure 1) .  The circuit consists of three main paths  the signal path, the gain-control path, and the dc-restore path.  The input video signalFile contains several Design Ideas, scroll to this one Design by Tamara Ahrens and Mike Wong, Elantec Semiconductor Inc, Milpitas, CA   

40 MHz Frequency meter on ATmega16 - This article shows how to build a small, cheap and simple frequency meter, without any fancy, out of reach components.  The simple proposed design can measure frequencies up to 40 Mhz with errors below 1%! This degree of precision will be more than

433MHz Super Remote Control - Using a PIC12F683 and a few transistors, it is theoretically possible to boost the power to a standard 433 MHz remote transmitter module.     (Note hypothetical image at right) . 
This design utilized 10 Pulse Coding for maximum range with minimal power draw.  Very short pulses are generated using a voltage multipier circuit described below.   __ Designed by Luhan Monat-Mesa Arizona

433MHz UHF Remote Switch - Ideal for remote control of practically anything you like and with a range of more than 200m, this wireless transmitter and receiver pair use pre-built UHF modules that make it easy to construct and use.__ SiliconChip

4-Channel Timer using Atmel 89C4051 & MAX7219 Display Driver - Easy build 4-channel timer, suitable for energy saving, simple hardware and nice firmware with c coding.  Automatic power down mode, simple settings, optional buzzer for sound alarm.   __ Designed by Wichit Sirichote

4-Input mini Logic Analyzer - A mini Logic Analyzer wich has 4 inputs, it's portable    (55x65 mm) , battery powered and can capture data up to 400kHz. __ Designed by © Vassilis Serasidis

4-Way Event/Race Anything Timer - It's based on a PIC microcontroller and can time up to four seperate events.  You can even get infrared sensors to start and stop the timin__ SiliconChip

50 MHz Frequency Counter - This project is nice and small frequency counter that reads frequency from 1 Hz to 50 MHz that I have modified from original designed by Weeder Technologies.  I have designed new PCB to fit with 16X1 LCD and change source code for compatible with new small PCB Specifications, Auto-ranging with floating decimal point.  , Up to 7 digits displayed on 1X16 LCD.  , Auto-adjusting gate speed    (0.1sec to 1 sec) .  , Microcontroller-based circuitry provides for simplicity, ease of assembly, and highly stable readout.  , Sensitivity approximately 100 mV RMS    (100 Hz to 2 MHz) , 800 mV RMSAT50 MHz.  , Input overload protected.  

50 MHz Frequency Counter Voltage Meter & SwR/PWR Indicator - This is a successor of the PIC16C71 4-digit LED f-counter & V-meter.  Some hard to find parts used in the previous version, which are out of production for some time, has been omitted.  A rather early PIC16C71 has also been replaced by 28-pin device PIC16F876 __ Designed by Aleksander Stare

500MHz PIC Prescaler - The prescaler kit is a simple divide by 10 ECL circuit which can be used to extend the range of most PIC based frequency counters from 50 MHz up to 500 MHz.  The kit uses surface mount components except for the 78L05 regulator.  

555 oscillator - This is the square wave oscillation circuit which used NE555.555 was developed as the IC for the precision timer.  It is compactness    (DIP 8 pins) and it is simple composition.  It is often used for the timer circuit, the oscillation circuit because of precision well the operation.   __ Designed by Seiichi Inoue

555 timer - 555 IC could be used for the oscillation circuit, too, but originally, it was developed as the IC for the precision timer.  The circuit to introduce on this page is the circuit to make do the operation of the relay in the constant time after pushing a start switch.  The circuit outside can be controlled using the point of contact of the relay __ Designed by Seiichi Inoue

555 timer based PWM controller for DC Motors & fans - This PWM controller is cheap and easy to build, but has no temperature control and with components shown runs at relatively low frequency. __ Designed by © Madis Kaal

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