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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:

Solar Powered Wireless Weather Station -  It's based on PICAXE processor and "wirelessly" transmits temperature and humidity data to a receiver up to 200 metres away.__ SiliconChip

Solar-Powered Intruder Alarm for Sheds & Boats -  Most blokes have got a shedor wish they had! While many people have alarms for their home and cars, a lot of valuable stuff is unprotected in garages and sheds.  It needs protecting and now you can do it with this simple alarm based on a PIR sensor.  It's solar-powered so no mains supply is needed.  And let's not forget boats on mooringsthey need protecting too.__ SiliconChip

Solar-Powered Lighting SystE - M -  Need lighting away from a power source? Try this one: it's ideal for your garden, shed or even a camp site.  With a 5W solar panel, a 12V SLA battery and a smart controller, it has 3-stage charging for the battery and Maximum Power Point Tracking    (MPPT) for the solar panel.__ SiliconChip

Solar-Powered Lighting System, Pt.2 -  Last month we described the operation of our new off-grid lighting system, featuring free power courtesy of the sun! Now we move on to the fun part: building it!__ SiliconChip

Solution Waiting for ProblE - M -  Think up an application for the Aura Interactor Amplifier and you could win a $200 gift Voucher.__ SiliconChip

Some Techniques for Direct Digitization of Transducer Outputs -  Linear Technology AN7 __ Designed by Jim WilliamsFeb 1st, 1985

Speech EEProm -  24LC512 EEPROMS contain 64k bytes and cost about $3.  That makes them ideal for adding some speech to small projects.  Here is the set of  (DOS) programs and files to do this.  This is how the speech was added to the Talking Fish project.   __ Designed by Luhan MonatMesa Arizona

Speech Synthesizer Development SystE - M -  This system was designed to facilitate the development of a low cost speech module using a PIC and some EEPROM memory.  This has already been done  (see PICTalker) using 64k of memory.  So far, this device is working with only 11k of memory by using techniques discussed below __ Designed by Luhan Monat-Mesa Arizona

Speed Alarm for Cars; Pt 1 -  Is your license looking a bit a bit dodgey? This compact speed alarm will help you stick to the speed limits.__ SiliconChip

Speed Alarm Pt 2 -  Last month, we gave the circuit details of our new compact Speed Alarm.  This month, we show you how to build it and give the installation details.  We also show you how to fit the speed sensor.__ SiliconChip

Speed Controller for Film Projectors -  Do you have old family movies on film? Have you watched them lately? You may be shocked by how much they have deteriorated over the years.  They need to be transferred to DVD before the film deteriorates to the point where it is unwatchable.  Video conversion is not as straightforward as you might think but this simple project enables you to do it.__ SiliconChip

Speedy logic translator uses little power -  07/08/98 EDN-Design Ideas In handheld equipment, component count and power consumption are critical considerations.  This design idea uses only a few transistors to configure a high-speed output stage of an RS-232C link while draining few precious milliamperes from the batteries.  In general __ Circuit Design by Davis Magliocco, CDPI, Scientrier, France

SPI Flash Microcontroller Programmer -  This SPI Flash Programmer can be used either for in-system programming or as a stand-alone serial flash programmer for the Atmel SPI programmable devices.  The programmer hardware interface is controlled by the PC parallel port and the parallel port control signals are freely selectable by the user.  The software supports both the 8051 and AVR series devices.   __ Designed by Mohammad Asim Khan

Spring Reverberation Module -  Build it and get great concert hall effects for your guitar or keyboard instrument.__ SiliconChip

Spydar 2 -  PIC Project  This is a circuit monitoring device.  It runs for over 10 days and can log up to 32k events both digital and analog.  Samples are logged either on a timing basis  (.01 to 2.5 seconds) , or on a triggered basis.  Four inputs are provided, up to three of which can be analog __ Designed by Luhan MonatMesa Arizona

Standalone Digital Voltmeter Uses a Multichannel ADC -  11/15/12  EDN-Design Ideas Monitor several different voltages with one instrument.  This Design Idea was realized for voltage/current measurement on a four-channel analog voltage source but has wide use in many other applications.  The design is based on the Atmel ATmega8-16AC microcontroller and the MAX1230 12-bit ADC  (references 1 and 2) .  Although the microcontroller has an internal 10-bit ADC, itís more efficient to use an external multichannel ADC than to multiplex more analog channels to the ATmega8-16AC differential ADC inputs __ Circuit Design by Branislav Korenko

Starship Enterprise Door Sounder -  Here's a project especially for trekkies.  At the closure of remote switch contacts, it recreates that distinctive "ssshhhhhhh-thump" sound of the sliding doors opening or closing on the "Starship Enterprise".  Use it for generating sound effects for your own sci-fi movies or for hooking up to a bedroom or wardrobe door so you can pretend you're aboard the "Enterprise" in deep space, going where no man has gone before!__ SiliconChip

State & Timing Modules for Agilent Technologies Logic Analysis Systems -  Application Note__ Aligent

Step Km Counter Max -  Pedometer has a range of 9.950 meters with2-digits.  Slip it in pants pocket for walking and jogging __ Contact: Flavio Dellepiane, fladello @ tin.it

Stepper Controller from Recycled Materials -  I am 13 I have always wanted to build a cnc machine but because inexpensive parts are hard to find in Canada I have had trouble trying to build a decent cnc controller.  The purpose if this Instructable is to show that anyone can build a cnc __ Designed by Radio LocMan

Stepper Motor Controller -  Use one of those surplus motors with these cheap and easy-to-build controller.__ SiliconChip

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

Stereo Audio Compressor -  Do you hate the way the sound level on your TV suddenly jumps during the advert breaks? Or do you find that the sound levels vary widely when switching between digital TV stations? Or maybe you have problems listening to CDs or MP3s in your car or against the background din during a party? Are the soft parts too soft and the loud parts too loud? This Stereo Compressor will solve that problem.  It reduces the dynamic range of the signal while still maintaining clean sound.  The unit is also ideal for use with PA systems.__ SiliconChip

Stereo Class-A Amplifier; Pt.5  -  In this article, we show you how to build a high-performance 20W Class-A Stereo Amplifier using the modules described over the last few months.  The unit will be available as a complete kit from Altronics and the assembly is straightforward.__ SiliconChip

Stereo Potentiometer -  in PDF format, text in Finnish

Stop Those Zaps From Double Insulated Equipment! -  If you have experienced mild tingles or shocks from double insulated equipment, you will want to know how to prevent them.  Here's our "Tingle Terminator": a simple solution to this vexing problem.  There is no need to gain access inside the equipment and it will not void the warranty.__ SiliconChip

Storage Oscilloscope Adapter -  Yes, it's finally here !.  The DSOA Mk3 has been a long time coming  (many years in fact) , but it was finally published in the October/November 98 issues of EA.  EA October 98 issue cover shot of DSOA Mk3 Here are the basic specs.  

Strategy Processes Video In RAM -  03/18/10 EDN-Design Ideas How you process images in RAM can eliminate problems with different image sizes.  Many video devices, such as the Analog Devices ADV7179 DAC, have analog-baseband-TV interfaces for PAL  (phase-alternating-line) and NTSC  (National Television System Committee) video signals.  Unfortunately, these kinds of DACs accept video in interlaced-image format only, but you may need progressive-scan video instead.  Furthermore, many of the progressive-scan images vary in size, which makes it more difficult to convert a progressive-scan image to an interlaced image.  Therefore, you need a universal and efficient image buffer, such as SDRAM or DRAM, as a strategy for separating the image field. __ Circuit Design by Tai-Shan Liao, National Applied Research Laboratories, Hsinchu, Taiwan

Studio Series Remote Control Module -  Works With Any Universal Remote Control!__ SiliconChip

Subwoofer Controller -  Adding a subwoofer to your home theatre or hifi system is the easiest way to extend the bass response.  A relatively small speaker system driven by a big amplifier can give heaps of bass while not taking up a lot of space.  This new Subwoofer Controller has all the features you could want, including low and high pass filters, parametric equaliser and auto-turn on.__ SiliconChip

Sun-Seeking Sunflower -  It senses where the sun is and automatically turns toward it.  A couple of solar cells power the circuit and driver the motor.__ SiliconChip

Super Remote -  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)  __ Designed by Luhan MonatMesa Arizona

Super Speedo Corrector -  Get your electronic speedo reading accurately__ SiliconChip

SuperCharger Addendum -  Did you build the SuperCharger decribed in Nov/Dec 2002.  If so, you need this simple 2-transistor add-on board.__ SiliconChip

SuperCharger for NiCd & NiMH
-  Build this advanced unit to fast-charge the new-generation super-capacity NiCd & NiMH
batteries.__ SiliconChip

SuperCharger for NiCd & NiMH
Batteries-Part 2
-  Completing construction and learning how to drive the new SuperCharger.There's also a handy table of beep error codes.__ SiliconChip

Superprobe -  The Superprobe project was designed to see how much could be done with a PIC chip and just a few parts.  The image at the right shows the capacitance measuring mode.   __ Designed by Luhan MonatMesa Arizona

Suppression of Prescaler Self-Oscillation 1/14/94  -  App Note  Doc #902__ California Eastern Laboratories

Surface Mount Flash Memory VPP Generator -  DN58 Design Notes__ Linear Technology/Analog Devices

S-video to composite video converter -  Some digital TV set-top boxes provide only S-video and component video outputs, which can pose a problem if your TV set only has a composite video inputor you've used up the S-video and component video inputs.  The same can happen with video tuner cards for PCs.  Here's an easy-to-build adapter to get you out of trouble.__ SiliconChip

Switch controls digital potentiometer -  02/27/02  EDN-Design Ideas The control of electronic potentiometers in most today's applications comes from controller-generated signals.  However, a significant number of applications exist that require adjustments using manual, front-panel controls.  The circuit in Figure 1 uses one IC, one switch, and 10 discrete components __ Circuit Design by Chuck Wojslaw and Gary M Craig, Catalyst Semiconductor, Sunnyvale, CA

Switch Debouncer -  This circuit will remove the transient spikes and contact bounces from a non-latching push button switch.   __ Designed by Andy Collison

System implements digital clock Modulation -  10/28/04  EDN-Design Ideas In spread-spectrum and direct-sequence receivers, it's often necessary to change the frequency of the clock oscillator, and thus the spreading-code clock, to lock the receiver's reference pseudorandom-noise code to the incoming cod __ Circuit Design by Dan Doberstein, DKD Instruments, Nipomo, CA

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

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