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

Last Updated on: Thursday, November 30, 2017 04:23 PM


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

Safe Flash Trigger for Your Digital SLR Camera -  Many of today's digital SLR cameras risk serious damage if used with an external electronic flash, whether that is a portable type or a large studio "strobe".  We found this was the case here at SILICON CHIP so we have produced a flash trigger to ensure the camera's safety.  You can do likewisebut beware of the JISP!__ SiliconChip

Santa & Rudolph Chrissie Display -  It is huge...It has colour...It has light...It has movement...It is the ultimate__ SiliconChip

Scenix & PIC Programmer -  I was trying to think of a suitable name for this project, and after literally seconds of careful deliberation, I gave up and decided to call it Fluffy.  Sorry.  Anyway, Fluffy is a SX programmer for people who have already experimented with PIC chips, and want to try out the Scenix SX family.  I built Fluffy because I wanted to experiment with the SX's, but didn't want to spend $300 or so bucks on the official development system.  To build it, you will need a PIC16F84    (a 16C84 will probably also work, but I don't have any to test!) .     __ Designed by Ben  last name not found

School Zone Speed Alert -  Have you been booked for driving through a school zone at well above the 40km/h limit? It's easy to do and can be a very expensive mistake.  Here's a project to help you stay out of trouble.  It keeps track of the time and flashes a warning LED during the morning or afternoon 40km/h time periods.__ SiliconChip

Schoolies Amp -  This 20W audio amplifier module sounds great and is dead easy to build!__ SiliconChip

SD Memory Card Interface -  SD memory cards, especially the ones under 1GB are cheap, relatively easy to interface and provide vast amounts of memory for imbedded control.   __ Designed by Luhan MonatMesa Arizona

Sealed Jar Lamp -  PIC Project  This device uses 2 AA alkaline batteries to power a 1 watt LED.  It has 4 power levels, plus on/off, and can run either side up.  The jar light is entirely sealed with no external switches.  An internal mercury switch controls all of the modes of operation.  It will work under water.  All components are mounted directly to the circuit board  (mouse over image above) .  A small piece of 1/4 inch board is glued to the inside of the lid.  The circuit board is fastened to this with 2 small wood screws.  Nothing penetrates the lid.   __ Designed by Luhan MonatMesa Arizona

SemTest: a Discrete Semiconductor Test Set; Pt.1 -  Check all those semiconductors in your collection with this easy-to-build test set!__ SiliconChip

SemTest: a Discrete Semiconductor Test Set; Pt.2 -  Check all those semiconductors in your collection with this easy-to-build test set!__ SiliconChip

SemTest: a Discrete Semiconductor Test Set; Pt.3 -  Now that we have looked at the full circuit of our new Discrete Semiconductor Test Set, it's time to describe its construction and the setting-up procedure.  We also describe how to fit a crowbar circuit to quickly discharge the HT after making high-voltage measurements.__ SiliconChip

Sensing Low-g Acceleration using the ADXL345 Digital Accelerometer Connected to the ADuC7024 Precision Analog Microcontroller  -  Sample code for the I2C configuration can be found at http://www.  analog.  com/static/imported-files/circuit_notes/CN0133_Source_Code.  zip__ Analog Devices from the Lab

Serial cable for Casio QV-200 digital camera -  Lose your cable? Build it yourself and save $29.  Fits many QV models __ Designed by Bob Blick

Serial Comms 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

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

Serial I/O Controller & Analog Sampler -  It connects to your PC's serial port and can switch relays according to voltage, resistance, temperature and digital inputs.  It also includes system timers and can be operated as a PLC-style controller__ SiliconChip

Serial input 4 Digit Readout -  PIC Project  This device uses an LTC4625 4 digit LED display  (with RH decimal points) , along with 2 extra LED's.  It requires only 5 volts, TTL serial input, and Ground on a 3 pin connector.  Note: the connector is mounted with the pins sticking out the back side to allow for mounting flush against a  (transparent) front panel.   __ Designed by Luhan MonatMesa Arizona

Serial PIC Tap -  One of the first things I like to do when creating a new project is to get the I/O working.  This helps in debugging the code as I write it.  What about projects that do not have I/O? This device sneeks both input and output from your computer  (terminal program) to the PIC using just one pin.   __ Designed by Luhan MonatMesa Arizona

Serial Port Tests Digitals -  25-Jun-09 EDN-Design Ideas The circuit in Figure 1 uses a MAX232 IC from Maxim to convert RS-232 voltage levels to TTL levels (Reference 1].  A 74HC4051 from Texas Instruments lets you select any of four digital inputs and route them to the serial port (Reference 2].  Listing 1 lets you control the RTS (ready-to-send] and DTR (data-terminal-ready] pins in the serial port that selects the signal under test __ Circuit Design by Yury Magda, Cherkassy, Ukraine

Serial Readout -  PIC Project  This device uses an LTC4625 4 digit LED display  (with RH decimal points) , along with 2 extra LED's.  It requires only 5 volts, TTL serial input, and Ground on a 3 pin connector.  Note: the connector is mounted with the pins sticking out the back side to allow for mounting flush against a  (transparent) front panel.   __ Designed by Luhan MonatMesa Arizona

Serial Receiver-32 Bit -  This is the schematic for an FM transmitter    (57.6 K Baud TTL & CMOS ) with 3 to 3.5 W output power that can be used between 90 and 110 MHz.  Although the stability isn't so bad, a PLL can be used on this circuit.   __ Designed by Bill Bowden

Serial to PIC Interface -  One of the first things I like to do when creating a new project is to get the I/O working.  This helps in debugging the code as I write it.  What about projects that do not have I/O? This device sneeks both input and output from your computer  (terminal program) to the PIC using just one pin.   __ Designed by Luhan MonatMesa Arizona

Seriously Bright 20W LED Floodlight -  Last February, we published a DIY 10W LED Floodlight, which has been enormously popular.  We said that one was almost blindingbut to paraphrase Croc Dundee, that's not bright.  THIS one is BRIGHT!__ SiliconChip

Setup Tests Bit-Error Rate -  03/18/04 EDN-Design Ideas Traditionally, the reception quality of a digital receiver is expressed in terms of BER (bit-error rate].  This figure is the proportion of received bit errors in a given period.  Typically, you measure the BER in the lab by applying an RF signal, modulated by a pseudorandom code, to the receiver under test __ Circuit Design by Israel Schneiderman

Shared-Memory Interface Eliminates Arbitration -  08/01/96 EDN-Design Ideas The design of a shared-memory interface for the ISA bus commonly requires a relatively complex arbiter, which grants access to an onboard device or to the ISA bus.  If an on-board device requires only infrequent accesses, the circuit in Figure 1 can eliminate the need for the arbiter.  Local access occurs during the execution of an ISA refresh cycle, thereby eliminating any risk of contention.  The RFRSH line signals the beginning of the refresh cycle; as long as this signal is active, the local device has full control of the memory. __ Circuit Design by Piotr Mazur, Wikom, Warsaw, Poland

Shielded Loop AntennFor DX AM Reception -  Dramatically improve your AM reception with this tuned loop antenna.  It's just the shot for remote areas & for minimising interference.__ SiliconChip

Shift Indicator & Rev Limiters for Cars -  If you drive your car for optimum performance, you will want this Shift Light Indicator to indicate just when to change gears.  As a bonus, it incorporates a Rev Limiter which throttles back the fuel injectors.__ SiliconChip

Short Message Recorder & Player -  Download WAV files from your PC and play them at will!__ SiliconChip

Shortwave Bug -  Circuit and notes only, no circuit description given.   __ Designed by Tony van Roon  VA3AVR

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

Signal Processor DSP for Radio Communications -  The W9GR DSP-3 is an improved low cost digital signal processor for radio communications use.   It features 18 DSP functions, a LED display, and 13 bit audio precision__ Quantics

Signature Series Kit Loudspeaker SystE - M -  These new speakers are among the very best kit speakers that money can buy.  They use the very-high-performance Fountek ribbon tweeters and Peerless woofers.  They will be a very good match to our recently described 20W Class-A Stereo Amplifier.__ SiliconChip

Silencing a Noisy Beast -  Don't bleat about a noisy PC.  Here's what to do so that you can enjoy THE SILENCE OF THE FANS!__ SiliconChip

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


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