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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:

Silicon Chip Passive DI Box -  Don't let hum & noise spoil your performance.  This DI box performs as well as a powered unit but doesn't need batteries__ SiliconChip

Simon Says -  Nostalgiait ain't what it used to be! Here's a PIC-based update of a popular game from the 1970's.__ SiliconChip

Simple Circuit "feeds" CMOS Devices -  10/09/97 EDN-Design Ideas To retain the data of CMOS devices, such as real-time clocks or setup RAM, you need to provide power to these devices while the rest of the circuit is off.  The conventional solution uses a CMOS switch, such as the CD4066.    __ Circuit Design by Luis H Loss, Iochpe-Maxion, Porto Alegre, RS, Brazil

Simple Circuit µC acts as Dedicated Motor control -  09/11/98 EDN-Design Ideas -  (Scroll to find this circuit design)   Motion-control systems often use a PWM signal to control the duty cycle for a motor driver or amplifier module.  Typical designs generate the PWM signals using µC with dedicated PWM output lines, such as the PIC16C65  (Microchip Technology, www.  microchip.  com) and the HC11  (Motorola Inc, www.  motorola.  com) .  However, these µC may have more features than necessary for a motion-control system with multiple degrees of freedom.   __ Circuit Design by Dylan Horvath, Gecko Sysytems Inc, Austin, TX

Simple Circuit 1.2-20V 1.5A Switching Regulator -  This tiny regulator board outputs 1.2-20V from a higher voltage DC supply at currents up to 1.5A.  It's small, efficient and cheap to build, with many handy features such as a very low drop-out voltage, little heat generation and electronic shut-down.__ SiliconChip

Simple Circuit Alcohol Level Meter -  The courts are full of people who thought they were fit to drive after having "a couple of drinks".  This simple little project will give you a good indication of alcohol on your breathand therefore your blood alcohol concentration  (BAC) .  It's up to you then to make the right decision and get a cab home instead!__ SiliconChip

Simple Circuit Colour Organ -  This is a simple, one lamp colour organ.  It is far less complicated then the Three Channel Colour Organ.  It is simply a lamp controlled by an SCR.  It can be built in a few minutes, and combined with other circuits to make some pretty neat effects.   __ Designed by Aaron Cake

Simple Circuit Data-Logging Weather Station, Pt.1 -  It's cheap and simple to build, operates completely unattended and will run for years on a set of AA batteries.__ SiliconChip

Simple Circuit Data-Logging Weather Station; Pt.2  -  Last month we introduced our new Rain and Temperature-Measuring Weather Station, with all the electronics.  This month we get into the nitty-gritty of building itall the mechanical detail and then actual contstruction.__ SiliconChip

Simple Circuit digital filter cleans up noisy data -  03/02/06  EDN-Design Ideas Cleans up data from pressure and temperature sensors __ Circuit Design by Richard Rice, Oconomowoc, WI

Simple Circuit DIGITAL PANEL METER for Low-voltage measurements Here's one of those really handy little projects that will cost very little but make life a whole lot easier when you want to measure voltage and current at the same time.__ SiliconChip

Simple Circuit FIFO provides data-width conversion -  09/26/02  EDN-Design Ideas Many designs require FIFO elastic buffers to form a bridge between subsystems with different clock rates and access requirements.  However, in some applications, you need FIFO buffers for data conversion.  One example is the case in  __ Circuit Design by David Lou, Ghent University, Ghent, Belgium

Simple Circuit FSK Modulator Enables Data Transmission Over Low-Speed Link -  06/11/09 EDN-Design Ideas Send digital data over a low-speed link.  FSK  (frequency-shift keying) is a type of signal modulation for transmitting digital data over an analog communication link.  An FSK modulator comprises a digitally controlled sine-wave generator whose frequency shifts between two predetermined frequencies in response to the two logic levels of the digital data.  The circuit in Figure 1 generates a sine wave by continuously sampling a single sine cycle.  The output of IC2A is proportional to the currents through R1, R2, and R3.  These resistors connect together at one end to the inverting input of IC2A, which is biased at VCC/2.   __ Circuit Design by Israel Schleicher, Prescott Valley AZ

Simple Circuit hookup increases AD2101's memory -  04/27/95 EDN-Design Ideas The circuit in Fig 1 increases the memory of Analog Devices' 2101 family of fixed-point DSP µPs.  The simple scheme uses only three external static-memory devices and no glue logic.  With the additional memory, the DSP µP will have __ Circuit Design by Bogdan Morariu Digital Dispatch Systems, Richmond, BC, Canada

Simple Circuit logic analyzer pushes microcontroller to its limit -  12/07/00  EDN-Design Ideas A simple logic-analyzer design is compatible with all versions of Windows and pushes the PIC 18C252 chip to its speed limit to achieve a 1-MHz sampling rate  (Figure 1) .  The circuit can examine three channels of relatively low-speed logic signals that have infrequent, or sparse, transitions.  The analyzer can record only 510 transitions per run, but a run can last as long as several minutes, if necessary.  Applications include monitoring the I/O of an IBM keyboard or printer port, TI-calculator intercommunication, and serial  (RS-232) signals __ Circuit Design by Tom Lyons Fisher, Inexpensive Systems, Huntingdon, PA, and Michael Deskevich, Juniata College, Huntingdon, PA

Simple Circuit Logic Probe uses Bicolor LED -  03/13/98 EDN Ideas -  (File has several circuits, scroll to this one) A project posed the challenge of replacing existing analog potentiometers  (used to set brightness and contrast levels]in video monitors with digitally controlled potentiometers.  The different brands and models of monitors presented widely varying voltages across the potentiometers.  The design.    __ Circuit Design by Mark Shill, Burr-Brown Corp, Tucson, AZ

Simple Circuit logic reduces EMI -  08/05/99 EDN-Design Ideas A current-input ADC whose primary use is measuring low-level signals from photodetectors can also measure a range of voltages using the circuit in Figure 1.  The main component is a dual-input current-integrating ADC, IC1.  IC2 and IC3 provide the buffered 4.096V reference for IC1 __ Circuit Design by Eugene Palatnik

Simple Circuit provides digital hysteresis -  12/03/98 EDN-Design Ideas -  (File has several circuit ideas.  Scroll to find this one.) It is sometimes useful to have hysteresis in a digital circuit—for example, in a power circuit under the control of a manual pulse generator, in which mechanical vibrations can produce position errors.  The circuit in Figure 1, which consists of a 4585 comparator  (IC2) , a 4019 switch  (IC1) , and one-sixth of a 4069 inverter  (IC3) , provIdeas digital hysteresis.  If DI=0, DA=8, and DB=6, then Output 12 and G2 of IC2 assume logic 1, and G1 of IC2 assumes logic 0.   __ Circuit Design by W Dijkstra, Waalre, The Netherlands

Simple Circuit RS232C Level Converter using Transistors -  Cheap and easy circuit for converting TTL logic to RS232C level using small signal transistors.   __ Designed by Wichit Sirichote

Simple Circuit setup tests bit-error rate -  18-Mar-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, Rosslare Israel Ltd, Rosh Ha'ayin, Israel

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

Simple Circuit Variable Boost Control for Cars with Turbochargers -  Quite a few cars have turbochargers these days and these can provide even more performance if the turbo boost pressure is increased.  However, you don't want permanently increased turbo boost as it increases wear on the engine, so you need a variable boost control, as presented here.__ SiliconChip

Simple Circuit VCOM adjustment uses any logic-supply voltage -  09/30/04 EDN-Design Ideas All TFT [thin-film-transistor] LCD panels require at least one appropriately tuned VCOM signal to provide a reference point for the panel’s backplane.  The exact value of VCOM  varies Page includes several designs.  Scroll to find this one __ Circuit Design by Peter Khairolomour and Alan Li, Analog Devices, San Jose, CA

Simple Circuit VGA/Video adapter -  This project is about creating VGA/Video signals  using the 8-bit AVR MCU.  The output can drive a TV set or a VGA monitor.  __ © Vassilis Serasidis

Simple Circuit VHF FM/AM Radio. -  Looking for an ideal first project? Try your hand at this simple radio.__ SiliconChip

Simple Circuit Voltage Switch for Car Sensors -  This Simple Voltage Switch can be used anywhere you want a relay to switch when a voltage reaches a preset level.  It has lots of applications in cars but can be used in any application where you have 12V DC available.  Having switched the relay on, it will then switch if off as the voltage being monitored drops below the preset level.__ SiliconChip

Simple, Cheap 433MHz Locator Transmitter -  So you made last month's 433MHz "sniffer" receiver and now fancy some adventurous tracking? Here's a versatile PICAXE-08M controlled transmitter, based around Jaycar's ZW-3100 companion 433.92MHz ASK  (Amplitude Shift Keying) module.  While relatively short range, this transmitter makes a great model plane or model rocket locator and/or tracking beaconsomething we?ve been asked about numerous times__ SiliconChip

Simplify computer-aided engineering with scientific-to-engineering conversion -  09/30/04 EDN-Design Ideas The simple yet useful formula in This design idea enables conversion from scientific format (for example, 2.2 9], which is typical for CAE (computer-aided-engineering], double-precision output Page includes several designs.  Scroll to find this one __ Circuit Design by Alexander Bell, Infosoft International, Rego Park, NY

Sine/Square Wave Oscillator for Your Workbench -  It uses a switched capacitor filter IC to give a very good envelope stability.__ SiliconChip

Single 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

SLow Motion Clock -  Sometimes the sleep mode will not work for some application that needs to keep an eye on some things while radically conserving power.  In that case, you can just slow down the  (RC) clock speed by switching a second resistor in or out of the circuit.   __ Designed by Luhan MonatMesa Arizona

Smart Card Reader & Programmer -  A Programmable Continuity Tester__ SiliconChip

Smart Radio Modem for Microcontrollers -  This low-cost project will enable your Picaxe, Stamp or other microcontroller to communicate without wires.__ SiliconChip

Smart' Slave Flash Trigger -  Does your camera's flash operate in red-eye reduction    (multiple flash) mode only? This clever unit counts the number of "pre-flashes" before triggering a slave flash unit.__ SiliconChip

SMS Controller, Part 2 -  Second article tells you how to complete the circuit checks and describes how the unit is used.__ SiliconChip

Soft Starter for Power Tools -  Stop that dangerous kick-back...__ SiliconChip

SoftStarter: Taming the Surge Current Menace! -  Are you alarmed by the juicy "splattt" from your mains power point when you plug in something like a large plasma TV set? Do you some-times burn out light and power point switches because of the surge currents at switch-on? Or perhaps you occasionally trip circuit breakers because of appliance switch-on surge currents.  This is a very common problem but there is a simple cure: our SoftStarter.  It tames those nasty surge currents while having no effect on appliance performance.__ SiliconChip

Software Calibrated, 1 MHz to 8 GHz, 60 DB RF Power Measurement System using the AD8318 Logarithmic Detector  -  Software Calibrated, 1 MHz to 8 GHz, 60 dB RF Power Measurement System Using the AD8318 Logarithmic Detector.  A calibration is performed by applying two known signal levels close to the endpoints of the AD8318 linear input range and measuring the corresponding output codes from the ADC.  This deviation is expressed in dB using the equation where CODE_OUT is the ADC output code; SLOPE_ADC is the stored ADC slope in codes/dB; INTERCEPT is the stored intercept; and PIN_TRUE is the exact  (and unknown) input level.  , The plots shown in Figure 3 through Figure 8 show the typical system performance that can be obtained using the AD8318 and AD7887BR in an RF power measurement system.  __ Analog Devices from the Lab

Software Implements Digital Potentiometer -  06/08/95 EDN-Design Ideas In some applications  (for example, dynamic biasing of laser diodes) , the use of digital potentiometers, or trimDACs, has limitations because of resolution, accuracy, or interface difficulties.  Using the simple  (but maybe not so obv __ Circuit Design by Gray Creager,  Xicor Inc, Milpitas, CA

Solar Charge Controller -  PIC Project  The previous version of this device used pulse width modulation  (PWM) to control the power from the five solar panels to charge the battery bank.  Under full sun conditions the MOSFETS got a bit warm and the whole unit radiated a lot of RFI.  This design uses a set of relays, one for each panel.  If the controller decides the battery voltage is too low, it engages another relay;.)  __ Designed by Luhan MonatMesa Arizona

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

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