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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:

Microcontroller becomes multifunctional -  10/25/01 EDN-Design Ideas - A microcontroller, by default, can execute only one program at a time.  What do you do if, in a given project, you need to performthan one operation at a time? Addmicrocontrollers to the design? In certain cases it's unnecessary.  Consider a real-life situation (Figure 1) .  The microcontroller constantly generates on its Pulse output pin a sequence of pulses with 25-msec duration __ Circuit Design by Abel Raynus, Armatron International, Melrose, MA

Microcontroller Clapper Switch -  Introduction I always thought the clapper so cool.  For those who are lazy like me, turn on or off the bedroom light without getting out of bed, simple clap your hands is amazing.  Thinking about it I projected one for me.  Several __ Designed by Toddy Cangica

Microcontroller Controls Analog Phase Shifter -  06/12/08  EDN-Design Ideas - By using a digital potentiometer in a phase-shift circuit, a microcontroller can precisely control phase shift __ Circuit Design by Nick Ierfino, IGS Technologies, Montreal, PQ, Canada

Microcontroller controls multichemistry battery charger -  09/28/00 EDN-Design Ideas - Figure 1 is a generalized block diagram of a multichemistry battery charger.  A COP8ACC5 µC handles its key charging features.  The µC is available in a 20-pin (15 I/O pins] SOIC or a 28-pin (23 I/O pins] SOIC/DIP.  It contains 4 kbits of internal ROM.  The controller's A/D inputs monitor __ Circuit Design by Kelly Flaherty, National Semiconductor, Santa Clara, CA

Microcontroller Delivers Voltage-multiplied DC Power -  05/11/06 EDN-Design Ideas - Use the microcontroller's comparator and PWM blocks to form a simple inductor-based boost converter __ Circuit Design by Aaron Lager, Masterwork Electronics, Santa Rosa, CA

Microcontroller Detects Pulses -  24-Jul-08 EDN-Design Ideas - A microcontroller detects output pulses in a device under test __ Circuit Design by Abel Raynus, Armatron International, Malden, MA

Microcontroller Directs Supply Sequencing & Control -  29-May-03 EDN-Design Ideas - Obtain higher voltage from a buck regulator - With the proliferation of dual-voltage architectures and multiprocessor boards, even simple applications can require several processor voltage rails.  With each processor having its own power-up and -down requirements, power-rail sequencing and control can become a complex task.  The challenge for power-supply designers is to consider each processor's timing and voltage requirements and assimilat __ Circuit Design by Joe DiBartolomeo, Texas Instruments, Dallas, TX

Microcontroller discerns addresses in RS-485 systems -  11/08/01 EDN-Design Ideas - One of the many benefits of using the RS-485 data-interface system, unlike the RS-232 system, is its ability to implement multidrop networks.  Such networks usually carry 9-bit data words, in which the ninth (parity] bit identifies each word as address or data.  When using small microcontrollers without a hardware UART, such as IC1 in Figure 1, designers must decide whether to add an exte __ Circuit Design by Nigel Brooke and Ted Salazar, Maxim Integrated Products, Sunnyvale, CA

Microcontroller Displays Multiple Chart or Oscilloscope Timing Ticks -  05/01/08  EDN-Design Ideas - A crystal controlled microcontroller generates precise timing ticks __ Circuit Design by William Grill, Honeywell, Lenexa, KS

Microcontroller drives 20 LEDs -  09/27/07  EDN-Design Ideas - Details and demonstrates the use of "Charlieplexing" to drive 20 LEDs using six available I/O pins on an 8-pin microcontroller __ Circuit Design by Dhananjay V Gadre of the Netaji Subhas Institute of Technology in New Delhi, India

Microcontroller Drives DSEC Motors -  11/18/10 EDN-Design Ideas - Use satellite disk motor in stepper-motor applications.  [Design Ideas by Charaf Laissoub, Valeo Interior Controls, Créteil, France __ Circuit Design by Charaf Laissoub, Valeo Interior Controls, Créteil, France

Microcontroller drives H bridge to power a permanent-magnet DC Motor -  15-Mar-07 EDN-Design Ideas - Improved H-bridge requires only two driver signals __ Circuit Design by Luca Bruno, ITIS Hensemberger Monza, Lissone, Italy

Microcontroller Drives LCD with Just One Wire -  3-Dec-07 EDN-Design Ideas - A Microchip PIC10F family microcontroller sparks an HD44780 LCD using a single I/O pin __ Circuit Design by Noureddine Benabadji, University of Sciences and Technology, Oran, Algeria

Microcontroller drives logarithmic/linear dot/bar 20-LED display -  01/18/07  EDN-Design Ideas - Do-it-yourself analog-to-LM3914 display driver offers user programmability __ Circuit Design by Dhananjay V Gadre and Anurag Chugh, Netaji Subhas Institute of Technology, New Delhi, India

Microcontroller Drives Piezoelectric Buzzer At High Voltage -  03/01/12  EDN-Design Ideas - Drive the buzzer directly from the μC’s I/O pins.  Piezoelectric buzzers find wide use in embedded systems for audible-signal generation.  You can drive a piezoelectric element directly from a microcontroller’s I/O pins, but the maximum voltage rating and loudness of a piezoelectric buzzer are typically several times larger than the voltage an I/O pin supplies.  Using four enhancement-mode MOSFETs that connect in an H-bridge configuration, the microcontroller can drive the buzzer at a high alternating voltage.  The gate terminals of the N-channel transistors in the lower arms of the bridge can connect directly to the microcontroller’s I/O pins.  The voltage level on the I/O pins is insufficient for switching the P-channel transistors, however.   __ Circuit Design by Mehmet Efe Ozbek, PhD, Atilim University, Ankara, Turkey

Microcontroller Drives Piezoelectric Buzzer At High Voltage through One Pin -  08/17/12  EDN-Design Ideas - If you're short on I/O pins, this circuit might solve your problem.   __ Circuit Design by Mehmet Efe Ozbek, PhD, Atilim University, Ankara, Turkey

Microcontroller emulates numerically controlled oscillator -  02/21/02 EDN-Design Ideas - Microcontrollers commonly add intelligence or digital functions to products, but they can also provide a variety of analog signals.  An 18-pin PIC 16C54 microcontroller, combined with an inexpensive, 8-bit DAC and a simple lowpass filter, can generate sine waves from dc to approximately 50 kHz with a tuning resolution of 24 bits __ Circuit Design by Tom Napier, North Wales, PA

Microcontroller functions as voltmeter -  10-May-07 EDN-Design Ideas - PIC microcontroller and FETs enable a four-digit voltmeter __ Circuit Design by Noureddine Benabadji, University of Sciences and Technology, Oran, Algeria

Microcontroller Inputs Parallel Data using One Pin -  2-Oct-08 EDN-Design Ideas - Clever use of pulses of various time constants allows a microcontroller to input a slowly changing serial pulse stream using a single I/O pin __ Circuit Design by Rex Niven, Forty Trout Electronics, Eltham, Victoria, Australia

MicroController interface for 5KW microwave oven -  Microwaves are maybe, one of the greatest discovers of the 20’th century.  With a vavelenght between 30 cm and 3 mm and a power between 1 mW and 500 KW are practically used in all fields from medicine to industry.  Microwave thermal and chemical tratments are well known for the high efficiency, with 3 to 1000 times greatest then conventional process because of direct energy transfer __ Designed by Vasile Surducan, Emanoil Surducan, Camelia Neamtu

Microcontroller makes effective frequency counter -  11/23/00 EDN-Design Ideas - Figure 1 shows an efficient and costeffective frequency counter using an Atmel 89C2051 mC (Reference 1) .  The design can use any mC of the 8051 family.  The circuit counts frequency and sends the count to a PC via the serial portPDF has several circuits, scroll down to find this one __ Circuit Design by Fazal Pathan, Physical Research Laboratory, Ahmedabad, India

Microcontroller Measures Resistance Without an ADC -  112/05/08 EDN-Design Ideas - By configuring the I/O ports of a microcontroller as an astable multivibrator, you can measure the resistance of a resistive sensor __ Circuit Design by Ashish Aggarwal, Netaji Subash Institute of Technology, Dwarka, India

Microcontroller Moving-Dot Display Interface Uses Three I/O Lines -  05/01/08  EDN-Design Ideas - A moving-dot LED-display interface to a microcontroller uses only three output pins __ Circuit Design by Abel Raynus, Armatron International, Malden, MA

Microcontroller multiplexes DIP switches to I/O port -  02/17/00 EDN-Design Ideas - At times, aµC must read a large number of DIP switches, such as for system identification, bus-address setup, manual configuration, or other purposes.  However, the available number of I/O lines is sometimes not enough to assign a switch to each one.    __ Circuit Design by Gregory Willson

Microcontroller multiplexes six digital potentiometers -  05/11/00 EDN-Design Ideas - In Figure 1's circuit, a µC lets you adjust as many as six digital potentiometers.  Like mechanical potentiometers, digital potentiometers can adjust regulator outputs or speaker volumes and act as rheostats.  Available in resistances of 50, 100, and 200 kV, they let you throw away your mechanical potentiometers and the little flat-headed screwdrivers that go with them.   __ Circuit Design by Ted Salazar, Maxim Integrated Products, Sunnyvale, CA

Microcontroller or DSP Controls On/Off Function -  13-Nov-03 EDN-Design Ideas - In many applications, a single on/off button switches the power supply on or off.  Usually, the system switches off regardless of the processing function or workload the microcontroller or DSP circuit is currently handling.  The small circuit in Figure 1 is intended to make the microcontroller or DSP circuit the master over this on/off function __ Circuit Design by Dirk Gehrke, Texas Instruments, Freising, Germany, and Frans Ravn, ChemoMetec A/S, Alleroed, Denmark

Microcontroller pin senses Ambient light, controls illumination -  10/26/06  EDN-Design Ideas - LED circuit senses light and controls its own brightness __ Circuit Design by Loren Passmore, Berkeley, CA

Microcontroller Produces Analog Output -  16-Oct-03 EDN-Design Ideas - A brushless dc motor needs several voltage levels to control its speed  0V to stop the motor, 5V to run it at maximum speed, and some voltages between these extremes to run it slower.  When you use such a motor in a system under microcontroller supervision, the microcontroller should generate all these voltages __ Circuit Design by Abel Raynus, Armatron International, Melrose, MA

Microcontroller programmer taps power from PC’s serial port -  04/26/07  EDN-Design Ideas - A PC's serial port can supply enough power to supply a microcontroller programmer __ Circuit Design by GY Xu, XuMicro, Houston, TX

Microcontroller protects DC-motor -  02/17/05  EDN-Design Ideas - Although any overloaded dc motor can draw excessive current and sustain damage, a cooling fan's motor is particularly vulnerable due to fouling by dust, insects, or misplaced objects.  A few fans include built-in overload protection __ Circuit Design by Abel Raynus, Armatron International Inc, Malden, MA

Microcontroller Provides an Alternative to DDS -  7-Jan-10 EDN-Design Ideas - Use a microcontroller to generate the codes for a DAC __ Circuit Design by Daniele Danieli, Eurocom-Pro, Venice, Italy

Microcontroller provides low-cost analog-to-digital conversion, drives seven-segment displays -  10-May-07 EDN-Design Ideas - Versatile conversion circuit detects and displays signal's peak value __ Circuit Design by Name withheld by author’s request

Microcontroller provides SRAM battery backup -  26-Jun-03 EDN-Design Ideas - To maintain content in the event of power loss, many designs that include SRAM require a dedicated device that can automatically switch from a standard power supply to battery operation.  Microcontrollers seldom find use in power-switching applications.  Because microcontrollers typically operate from the primary power supply, they stop execution if that supply drops, thereby making it impossible __ Circuit Design by Dave Bordui, Cypress Semiconductor, Orlando, FL

Microcontroller provides timer function -  01/04/01 EDN-Design Ideas - The circuit in Figure 1 is a µC-based programmable timer with two output channels.  The first channel, activated by pressing the red switch, S3, has a red LED at its output.  This channel is active until it reaches its desired time-out point.  The second output channel connects to a green LED __ Circuit Design by Tito Smailagich, ENIC, Belgrade, Yugoslavia

Microcontroller selects minimum/maximum value -  09/20/01 EDN-Design Ideas - Microcontroller-based systems for measurement, sensor-data processing, or control, sometimes require you to determine a maximum or minimum data value.  For example, in an object-detection system, such as a radar or sonar system, the microcontroller receives echo signals from multiple targets and then must select the closest one; in other words, it must determine the minimum distance __ Circuit Design by Abel Raynus, Armatron International, Melrose, MA

Microcontroller sensor & actuator interfaces -  The high current driver circuit is used when you need to supply more than a few mA to a load such as an LED or a relay.  In this example the I/O pin of your microcontroller such as a BASIC Stamp is driving the base of the transistor Q1 through a 1K resistor and diode D1.  The diode is there because if Vcc on the transistor is higher than 5V you don't want that coming back into your microprocessor, the 1K resistor is there to limit the current into the base of the transistor __ Designed by Chuck McManis

Microcontroller Serial Port Measures Pulse Width -  07/15/10 EDN-Design Ideas - Direct digital synthesys lets you generate a clock at frequencies needed for a standard serial port.   __ Circuit Design by Vishwas Vaidya, Tata Motors Ltd, Pune, India

Microcontroller simplifies battery-state-of-charge measurement -  04/27/06 EDN-Design Ideas - Monitor battery status for renewable energy systems __ Circuit Design by Abel Raynus

Microcontroller takes control of comparator -  09/01/00 EDN-Design Ideas - In many µC applications, a signal conditioner modifies an analog input signal from a sensor and passes it to the µC for processing.  The last stage of the signal conditioner is always a device that transforms the signal level to a value acceptable for the µC's input.  Usually, it is a comparator.  Often, this signal channel is open or closed for some programmable time period.   __ Circuit Design by Abel Raynus, Armatron International, Melrose, MA

Microcontroller visualizes hex code -  04/27/00 EDN-Design Ideas - In µC systems, information exchanges usually use the hexadecimal 1-2-4-8 format; output data also appear in this format.  Reading the hex code is not a problem; several LEDs connected to the output lines can display the answer.  The problem arises when you wish to observe the output data.  Many engineers are unfamiliar with hex code and prefer to observe data in the common decimal format.   __ Circuit Design by Abel Raynus

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


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