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Digital  / Logic Circuits 
Digital Circuits:   #'s - C       D - G       H - M       N - R       S - T       U - Z

Last Updated on: Monday, December 25, 2017 01:50 PM

Circuits Designed by Dave Johnson, P.E.

Audio Frequency Digital Noise GeneratorWhen you need to test an audio circuit with broadband noise, this circuit works great.  It uses just three inexpensive C-MOS ICs that generate a series of output pulses whose widths vary randomly.  I included a level control pot. . . Circuit by Dave Johnson P.E.-July, 2000

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Analog Datalogger Based On T89C51RD2 -  I had requested by head of the department of Applied Physics to design a low-cost device for the workshop on "Building Simple Instrument for Physics Lab" held in August 1, 2003 at the Faculty of Science, KMITL.  The workshop has 29 participants.  All of them are from high school physics teachers.  The project was the cooperation between Institute of Science and Technology Teaching Promotion and the Faculty of Science, KMITL.  Basic concept of the hardware is not so different from the Minilogger V1.0.   __ Designed by Wichit Sirichote

Analog-Input serves any microcontroller -  20-Dec-01 EDN-Design Ideas The simple ADC in Figure 1 is perfect for getting analog signals into a purely digital microcontroller.  Using just five surface-mount parts, you can assemble it for less than 50 cents   (1000], which is approximately half the cost of a single-chip-ADC approach in the same volume.  Moreover, this design takes only one pin from the microcontroller to operate __ Circuit Design by Steven Hageman, Agilent Technologies, Santa Rosa, CA

Analog-to-Digital Conversion Notes -  This chapter shows how to connect an analogue signal to a PIC. 
An analogue signal is similar to a sine wave and is generally less than 5v    (5,000mV) in amplitude.  Low-level signals are generally expressed in mV, to make them instantly recognisable and easy to talk about.   __ Designed by Colin Mitchell

Analyze Analog Signal Data with a PC-Hosted Logic Analyzer & Excel -  Application Note__ Aligent

Anti-crosstalk for Network I/O -  PIC Project  This example is using a PIC16F628a real favorite of mine recently.  Among its other features is a full function hardware UART.  This circuit was part of a servo motor controller circuit using a 74LS07 in the design.  One    (left over) section of this chip is used to provide the open collector output drive.   __ Designed by Luhan MonatMesa Arizona

Anti-symmetric FIR filter slashes resource use -  EDN-Design Ideas 12/22/2014    An anti-symmetric FIR design with the same implementation advantage as a symmetricFIR filters used for signal manipulation in the digital domain have either a symmetric or anti-symmetric impulse response, i.e., where N is the order of filter.   Anti-symmetric filters have a phase-shift property and are widely used as phase shifters.  Consider an FIR filter of order N, with N + 1 coefficients.  For a symmetric FIR filter of order N, by exploiting the symmetric nature of the filter, the memory and multiplier requirements are scaled down by almost 50%.   This  Design Ideas extends the same advantage to anti-symmetric filters. __ Circuit Design by Punithavathi Duraiswamy

Appliance Energy Meter, Pt.1 -  Want to know how much electricity appliances in your house are using and how much they cost to run.Build this Energy Meter and find out.__ SiliconChip

Appliance Energy Meter, Pt.2 -  Second article has all the construction and setting-up details.  Build it to help control your energy costs.__ SiliconChip

Arduino: What's All the Fuss About -  The low-cost, open-source Arduino microcontroller development board has taken the hobby-electronics world by storm and is now gaining popularity with experienced engineers as well.  So what?s all the fuss really about? And anyhow, what's with the name "Arduino" and where did it come from? Read on!__ SiliconChip

Arduino-Compatible I/O Controller -  Want to control somethinganythingwith commands from your PC? Perhaps turn sprinklers on and off to water your garden? Maybe read some sensors? Or even sequencing Christmas tree lights in time with music?    (OK, so we're getting in early!) Making the computer output the correct information is one thing.  Interfacing that data to control real-word devices is another.  That's what this nifty little relay box is all about.__ SiliconChip

Array Logic Provides High-Speed Multiplication -  07/18/96 EDN-Design Ideas Using embedded-array programmable logic, it's possible to build multipliers that run faster than previous programmable-logic implementations.  With the method shown here, you can make 4�4 multipliers that run at 73 MHz, as well as 8�8 multipliers that operate at 23 MHz.  The design approach involves using embedded arrays as large look-up tables to store the possible results __ Circuit Design by Greg Steinke and Martin Won, Altera Corp, San Jose, CA

AT89C2051 Digital Thermometer & Clock -  Build your own a laboratory instrument for measuring time and temperature.  The DigiThermo demonstrates the use of 'C' language, a dual-slope converter, LCD interfacing, and digital filtering as well.   __ Designed by Wichit Sirichote

AT89C2051 Night Light Saver -  Build a device that turn on and off a night light automatically.  Save Energy, No EMI, No Battery, Built-in Lamp Fixture, and Peak Shaving.   __ Designed by Wichit Sirichote

AT89c2051 Real Time Controller -  This is my long history the device that controls my home's night light, air-conditioner, etc.  The device is a Miniature Real-time Controller.  The circuit uses only three chips, a 89C2051, DS275   (or MAX232) , and 74LS07 open collector driver.  The scheduler for time on/off of 6-channel output can be made by downloading from PC and saved into onchip RAM.  Each output provides a 20mA sinking suitable for driving a homemade opto-TRIAC or big solid-state relay for heavy load.   __ Designed by Wichit Sirichote

AT89C2051 serial COMs to LED driver -  This document describes the HSETI PCB.  This PCB is a small simple application for the Atmel AT89C2051 microprocessora 20 pin 8051 variant, with FLASH    (reprogrammable) program memory.  The board has just two chips on it, the CPU and a driver/buffer.  __ Airborn Electronics, Australia

AT89c2051/4051 Stepper Motor Interface -  M1 is a stepper taken from an old disk drive.  There are five pins, i.  e.  , common, coil 1, 2, 3 and 4.  Resistance measured between common pin and each coil is about 75 Ohms.  Driving current for each coil is then needed about 60mA at +5V supply.  A darlington transistor array, ULN2003 is used to increase driving capacity of the 2051 chip __ Designed by Wichit Sirichote

AT89Sxx Cheap & Simple Circuit Learning Board -  Build your own a cheap simple Microcontroller learning board S-52.  The board is based on ATMEL's new ISP chip AT89S51, AT89S52, or AT89S53.  This board can be used by beginners for learning Assembly and C language programming.  Single sided PCB file included.   __ Designed by Tahan Prahara prahara_satria @ yahoo.co.id

AT90S8515 Experimenter Board -  Schematic only, no text included __ Designed by Mike Lambardo

Atmel 8051 Flash Based Microcontroller Programmer -  The Atmel Flash devices are ideal for developing, since they can be reprogrammed easy and fast.  If you need more code space for your application, particularly for developing 89Cxx projects with C language.  Atmel offers a broad range of microcontrollers based on the 8051 architecture, with on-chip Flash program memory __ Designed by Wichit Sirichote

ATMEL 89 Series Flash Microcontroller Programmer Ver 2.0 -  This programmer was designed in view of to be flexible, economical and easy to built, the programmer hardware utilizes the standard TTL series parts and no special components are used.  The programmer is interfaced with the PC parallel port and there is no special requirement for the PC parallel port, so the older computers can also be used with this programmer __ Designed by Wichit Sirichote

Atmel 89C2051 In-Circuit Programmer Schematic -  This is a "beta release" schematic.  Use at your own risk The idea is to add this circuitry to a board with already has ram at 2000 and an 82C55 I/O chip to provide ports A, B and C.   __ Designed by Paul Stoffregen

Atmel 89c2051 Prototype 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

Atmel AVR Atmega 8535/16/32 & AT89S5x Family Learning Kit -  The LED board provides 8-bit dot LED.  The board can tie to the main PCB easily with a 10 pin ribbon cable, Single and Double LED version avaible __ Designed by Wichit Sirichote

Atmel AVR ATtiny45 Development board -  During development of a project with ATtiny45 i experienced some difficulties with programming with STK500, so i decide to build this tiny board.  Nothing Fancy about it but i am sure you find it useful in your experiments with that micro.  __ AVR Projects Dim

Atmel AVR Infrared Downloader-Part 2-Target-Side -  In the first part we have considered a circuit design and software of Host-part.  The target-side consist of device minimum system based on ATmega162 and infrared hardware unit.  Device minimum system consist of ATmega162, external SRAM 8 kbyte and__ Radio LocMan

Atmel AVR Programmer -  Easy-to-build AVR C-programming circuit that can program the 40-pin AT90S4414/8515, the 20-pin AT90S1200/2313, and the eight-pin AT90S2323/2343.  The programmer uses only three chips.  It connects to the host PC's serial port via a MAX232 RS-232 transceiver, IC1.  Power comes from a 9V wall cube and the 78L05 linear regulator, VR1.  The AT89C4051 C    (IC2) works with the 11.0592-MHz oscillator, and controls all programming tasks.  LED1 indicates the programmer's status.  

Atmel Mega32 8ch Analog signal measure logger -  Data acquisition    (DAQ) and data logging circuit diagrams / circuit schematics__ Thomas Scherrer OZ2CPU

Atmel Mega88 Dual Temperatur meter -  Microcontroller based electronic circuit__ Thomas Scherrer OZ2CPU

Atmel Mega88 LED temperature meter 2015 -  Microcontroller based electronic circuit __ Designed by Thomas Scherrer OZ2CPU

Atmel Mega88 Temperatur meter, Type K sensor, Heat set & regulator -  Microcontroller based electronic circuit__ Thomas Scherrer OZ2CPU

Atmel Solar Panel Battery Charger -  Batwatch is a simple monitor for a solar panel battery charger, using an Atmel ATtiny13V.  It periodically measures the charge current and battery voltage, and shows them by blinking two LEDs.  I built this circuit into the plug of a VW solar charger panel that is used to prevent a discharge of the battery when a car is not used for some time.  A modern car contains a large amount of electronics, and a quiescent current of 40-50mA    (about 1Ah per day!) is considered "normal".  

Atmel TWI -  Explains an I2C multi-master bus issue on the Atmel AVR 8-bit microcontrollers.  Shows logic analyzer traces of TWI    (two-wire interface) .   __ Contact: David Cook

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Digital or Logic Circuits:  #'s - C       D - G       H - M       N - R       S - T       U - Z

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