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

Last Updated: December 29, 2017 03:15 AM

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Darkroom timer using PIC16F84A - Yet another darkroom timer using a PIC 16F84A 4 mhz.  I tried to design a timer that would do everything it needed to do but with the smallest number of pieces and simplest mode of operation.  It only needs the PIC, a four digit LED display, one other IC, a resistor network, one pushbutton switch and a capacitor.  It can run on batteries if you use a solid state relay to turn the exposure light on and off thereby adding a minimum of parts to make a fully functional darkroom timer.  A simple regulator would add only a few extra parts and allow the use of a "wall-wart" for power __ Designed by Lloyd Gordon

Data Acquisition System with VB - Build a data acquisition system with Visual Basic and the 89C51.   __ Designed by Wichit Sirichote

Data Acquisition using Atmega8 - Build the AVR ADC board and PC software for temperature logging __ Designed by Wichit Sirichote

DC Amplifier for Pyranometer  - The study program for 3rd Year Applied Physics students has a course on Measurement Laboratory I.  The students must attend for 10 labs.  I have three labs, 1) Ultrasonic Measurement: to measure sound velocity in the water with pulse-echo-overlap, 2) THDV Measurement: to study how 3rd harmonic appears in AC supply and how to measurement such distortion and 3) Solar Radiation Measurement: to study how to measure daily insolation and to find the system efficiency of the utility backup PV system.  This led me to develop the signal conditioning circuit to amplify the EMF produced by pyranometer. __ Designed by Wichit Sirichote

DC Power Supply - Build a simple DC supply having three output terminals: regulated +5VDC, unregulated +10VDC and 7.5VAC.  The supply is suitable for microcontroller experimenting.   __ Designed by Wichit Sirichote

DC Voltage & Current Source - A reference volatge and current source for testing data converter and analog amplifier.  A simple circuit built with TI LinCMOS opamp, TLC254C provides multiple outputs: +2.5V, 0 to +2.5V and 0 to 250uA.  The circuit is operated with 9V battery. __ Designed by Wichit Sirichote

DC/AC inverter (1) - This is the circuit which outputs 100 V of the alternating current from the input of 12 V of the direct current.  It is convenient to use the equipment which works in the alternating current using the battery  (DC12V) of the car.   __ Designed by Seiichi Inoue

DC/AC inverter (2) - On this page, I will explain DC/AC invertor with center-tapless transformer.  As for the DC/AC invertor with center-tap transformer, refer to "DC/AC invertor  (1) ".  The invertor that I made this time uses power MOS FET as swtching device.  I assum that this unit is used with the battery of car.  So, the input voltage is +12V DC.  The output voltage is AC 100V.   __ Designed by Seiichi Inoue

DCF-77 PIC LED clock - DCF77 is the name of a german radio station on 77.5 KHz, which gives official time and date from an atomic clock located in Francfort.  The time and date is coded into a 59 bit length frame, and is sent on the air through an antenna, by a 50 kilowatt power amplifier.   __ Designed by Bruno Gavand

DCF77 PIC16F84A Single-Nixie clock - Here is the nixie clock !  PIC16F84A microcontroller, single-digit Nixie, sequential hours, minutes and seconds display DCF-77 atomic clock, with automatic or manual time set-up high voltage power supply for Nixie with only 4 components 24 hours cycle programmable extinction time no MikroC compiler licence needed __ Designed by Bruno Gavand

Dead-Simple Circuit Masthead Amplifier - Decided to take the plunge and get into digital TV? For most people, it's simple - just plug the new TV or set-top-box into your existing antenna.  But for many, the old TV antenna and cable just won't be up to it.  Here?s a new kit from Oatley Electronics which could solve your digital woes __ SiliconChip

Debug a Microcontroller-To-FPGA Interface From the FPGA Side - 12/05/09 EDN-Design Ideas - Monitor activity through a JTAG download cable __ Circuit Design by Bibo Yang, Sunrise Telecom, Beijing, China

Debugging an MCU-based CCD camera Controller - Application Note__ Aligent

Debugging serial I/O - Application Note__ Aligent

Debugging Terminal - Build a simple 9600 BAUD 8n1 terminal for debugging and testing device having RS232C output.  A Microchip PIC16F84 connects a 16x1 line LCD for displaying ASCII code received.   __ Designed by Wichit Sirichote

Decorative light Controller - Dimmer control is often used to change the brightness of the light with AC.  Bidirectional thyristor  (TRIAC) is used for controlling current.  The circuit which controls a thyristor using a variable resister and a capacitor is common.  The circuit introduced on this page is a circuit which controls a thyristor by software of PIC.  It is also possible to make control the electric bulb on a Christmas tree bright gradually and dark gradually.  Blink control of various patterns can be performed.   __ Designed by Seiichi Inoue

Definition of terms, Q&As - Application Note__ MiniCircuits.com

Delta Audio XL-02 Towers - A high-power 2-way system that you build from a kit__ SiliconChip

Deluxe Lead-Acid Battery Zapper & Condition Checker  - Improved design can check battery condition and has output sockets so that you can monitor the zapping pulses using a multimeter__ SiliconChip

Design aid for MC34063A switcher chip (JavaScript) - This is a simple-minded design tool that allows you to calculate component values MC34063A simple switcher chip.  It displays the appropriate scematic diagram  (step-up, step-down, or inverting) and checks for current and voltage limits.  Feedback resistors are chosen from standard component values so that the output is as close to desired value as possible. __ Designed by Madis Kaal

Designing a 4-Channel A/D ADC converter with the PIC12C671 - This application expands on our earlier projects using the PIC12C671 series A/D converter.  If you missed the first articles covering the PIC12C671, you may want to review them to gain a full understanding of how to configure the onboard 4MHz oscillator of the PIC12C671 __ Designed by Reynold's Elec

Designing Low Noise Amplifiers for PCS Applications 8/25/97 - App Note  Doc #923__ California Eastern Laboratories

Designing Low Power Products using MSP430 Microcontroller - The use of battery-operated electronics gadgets is increasing fast in our daily lives.  Products are expected to be versatile, while consuming minimal power.  Reduced power consumption has added advantages of smaller...__ Electronics Projects for You

Developing a CDMA Handset ASIC with Reconfigurable System Prototyping - Application Note__ Aligent

Device Programmer-Atmel 89 Series - Powerful programmer for the Atmel 89 series of microcontrollers that includes 89C51/52/55, 89S51/52/55 and many more.  With this article you can make your own programmer.  This is a complete programming solution when it is attached to a suitable power supply and connected to your personal computer.  Proload and Firmware Version 4.1 at 57600 speed.   __ Designed by Wichit Sirichote

Different Programs In the Chip using a PIC16c510 Scroll to find this circuit #3 - Up to 5 different programs can be burnt into a single '508A and the required program can be accessed by soldering a resistor between one of the outputs and the "input-only" line - GP3, as shown in fig: 4. 
During turn-on, a special program will put a HIGH on each output in turn and the output containing the resistor will determine the program.   __ Contact: Colin Mitchell

Differentiation - This circuit is used when getting the signal having to do with the pulse from the input signal of the square wave.  The circuit of this form is used to interrupt the relation having to do with the direct current among the circuits, too.   (Direct current cut) In the case, the signal of the square wave causes the warp.  Also, in case of the analog signal, the voltage which is output in the capacity of the capacitor changes.  The influence comes out to the extent that the input signal is low-frequency __ Designed by Seiichi Inoue

Digital & Binary clock with thermometer & hygrometer - Here we have a clock.  It's not another clock.  It has digital and binary output.  It also has a thermometer and a hygrometer.  It's not another thermo-hygrometer.  It display's absolutely humidity  (gr/m 3) also.  Schematic __ Designed by Konstantinos Bellosstyle

Digital Audio Delay for Perfect Lip Sync - Do you have a large plasma or LCD TV set and a home-theatre system? If so, you may have problems with sound and picture synchronisation  (lip-sync) .  This Digital Audio Delay unit allows you to get the picture and audio perfectly matched.  to choose from.  To help you in this choice we gathered a number of these to test along with some expansion boards that might help you connect the Maximite to the rest of the world.__ SiliconChip

Digital audio setup on a cheap side - I always wanted to know more about signal processing than I currently do, so I have been eyeing various solution to set myself up with equipment that would allow to get some audio into my PC, and out of it - without busting my budget. __ Designed by Madis Kaal

Digital Bench Power Supply - PIC Project  This unit delivers 0 to 20 volts at up to 4 amps in 0.1volt increments.  The entire device runs on a PIC16F870    (about $3 in small quantities) .  This is basically a switching power supply with the voltage regulation done in software.  The PIC used here has analog inputs    (used to measure voltage and current) and hardware PWM    (pulse width modulation) output used to control the power.   __ Designed by Luhan Monat-Mesa Arizona

Digital Clock - On this page, I will introduce the PIC controled circuit which is the heart of Ultra High Accuracy Digital Clock.  For the details of the clock, refer to "Ultra High Accuracy Digital Clock version 2". 
As for PIC, PIC16F873 is used in the relation of the input-output port.  Also, to make a circuit compact, CPLD is used for the peripheral.   __ Designed by Seiichi Inoue

Digital Clock with Alarm using DS1307 - DS1307 is a hardware realtime clock, which works on I2C protocol.  Better graphics using the same old fashioned alphanumeric LCD  (type HD44780) .  Icons which shows the status for Alarm ON/OFF state, which gives a nice and cute look to the clock.   __ Designed by Wichit Sirichote

Digital combination lock using paIR of CD4 013 CMOS chips - The Circuit Board is Designed to accept 2 types of Drive transistors.  I Used a 2N3906 in this schematic, but for Higher Current Drive for a Solenoid, You can use Various T0-220 PNP types of transistors.  USE ONLY ONE OR THE OTHER, NOT BOTH.  In the Picture, I just put a Resistor and LED, where the Solenoid should go.   __ Designed by G.L. Chemelec

Digital Dialer - This circuit is the up down circuit of the digital counter which used a rotary encoder.  Two sliding switches are incorporated into the rotary encoder.  The timing that each switch closes is shifted.  Because this circuit detects the timing that each switch closes, it judges the clockwise  (CW) or the counterclockwise  (CCW) of the switch, and adds or subtracts a counter __ Designed by Seiichi Inoue

Digital Electronic Lock - The digital lock shown below uses 4 common logic ICs to allow controlling a relay by entering a 4 digit number on a keypad.  The first 4 outputs from the CD4017 decade counter  (pins 3, 2, 4, 7) are gated __ Designed by Bill Bowden

Digital potentiometer programs & stabilizes voltage reference - 05/30/02 EDN-Design Ideas - The potentiometer portion of a mixed-signal, digitally programmable potentiometer adds variability to an analog circuit, and its digital controls provide programmability.  You can use a digital potentiometer in two ways in an analog circuit.  You can use it as a two-terminal variable resistance, or rheostat, or as a three-terminal resistive divider __ Circuit Design by Chuck Wojslaw, Catalyst Semiconductor, Sunnyvale, CA

Digital RF Level & Power Meter - Need to measure small signals at radio frequencies? Here is a low-cost digital level and power meter which will allow you to measure RF signals from below 50kHz to above 500MHz.  As well as indicating the signal level in volts and dBV, it also shows the corresponding power level  (into 50 ohms) in both milliwatts and dBm.__ SiliconChip

Digital Signal Controls Sine Generator - 05/15/03 EDN-Design Ideas - The circuit of Figure 1 produces an accurate, variable-frequency sine wave for use as a general-purpose reference signal.  It includes an eighth-order elliptic, switched-capacitor lowpass filter, IC3, which uses a 100-kHz square-wave clock signal that microcontroller IC2 generates.    (Any other convenient square-wave source is also acceptable __ Circuit Design by Simon Bramble, Maxim Integrated Products, UK

Digital Tachometer for Your Car - Compact design features a 4-digit LED display and a bargraph.  It can also provide gearchange indication and drive a rev limiter.__ SiliconChip

Digital Thermometer/Thermostat - It covers the range from -55 C to 1200C and has an over or under temperature alarm and switched outputs for thermostatic control.__ SiliconChip

Digital Thermometer-Cum-Controller - This standalone digital thermometer controls the temperature of a device according to its requirement.  It also displays the temperature on four 7-segment displays in the range of 55C to +125C.  At...__ Electronics Projects for You

Digital Timer for Less than $20 - Just "nick" the timer from an old microwave oven and fit it into a case.  The resulting timer has lots of uses.__ SiliconChip

Digital Volt & Amp Meter with Temperature Control - This project was designed and constructed as enhancement to the 0-30V Stabilized Power Supply Project with the DIY electronics hobbyist in mind.  The circuit uses a single PIC Microchip to perform the Voltage, Current and Temperature conversions and display functions.  The PCB Board uses large  __ Designed by RSABear 2008

Digital Voltmeter for Your Car - A PIC microcontroller makes it a snack to build.__ SiliconChip

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

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