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Last Updated: December 01, 2017 03:41 AM

Circuits Designed by Dave Johnson, P.E.

Control Variable LED IntensityThe circuit below uses power from four rechargeable AA NiMH
cells to drive 3 white LEDs.  A potentiometer varies the duty cycle of a pulse width modulator circuit to vary the intensity of the LEDs from 0% to 100%.  The beauty of the circuit is that when the . . . Hobby Circuit designed by Dave Johnson P.E.-September, 2009

Controlled Up/Down Ramping LightThere are times when you want a lamp to gradually change from dark to light and from light to dark, with each push of a pushbutton switch.  The circuit below performs this control function using a flip/flop and a classic pulse width modulation or PWM . . . Hobby Circuit designed by David A. Johnson P.E.-March, 2009

Controller for a 9v Powered Xenon PhotoflashThis 9v battery powered circuit is designed for remote control flash needs.  A charge control circuit turns off the high voltage generator when the photoflash capacitor is fully charged.  A neon lamp is included to indicate when the system is ready to flash . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000




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

Continuity Tester with a Chirping Sound -  Today, there’s a party at your home.  And you are busy detecting faults in the decorative lights hanging over the boundaries of your house.  You want to finish the job before...__ Electronics Projects for You

Continuity Tester, Low-Voltage -  Several simple circuits were tried -a lamp, battery and probes still demanded the attention of the eyes; replacing the lamp with a buzzer was more successful but needed some three to four volts and gave no indication of a series semiconductor.   __ Designed by Tony van Roon  VA3AVR

Continuity Tester-essential for Digital projects -  This is another invaluable piece of test equipment for digital work.  It has been designed by us to cater for a particular application servicing digital projects sent in for repair.   __ Designed by Collin Mitchell

Control 32 DAC Channels via a Parallel Port -  EDN-Design Ideas July 8, 1998    This circuit controls 32 voltage-output channels from the parallel port of a PC.    __ Circuit Design by Mark A Shill, Burr-Brown Corp, Tucson, AZ

Control a DC Motor with your PC -  08/26/10 EDN-Design Ideas Use the printer port to select three different speeds.    __ Circuit Design by Firas M Ali Al-Raie, Polytechnic Higher Institute of Yefren, Yefren, Libya

Control a processor's power supply in real time 31-Mar-05 EDN-Design Ideas Dynamic control of processor's supply rail minimizes power consumption __ Circuit Design by Yogesh Sharma, Analog Devices, San Jose, CA

Control accurate incremental voltage steps with a rotary encoder -  EDN-Design Ideas 11/30/2015    This handy little DI circuit affords precise voltage-step control and makes a good pot replacement in many cases __ Circuit Design by Anthony Smith

Control an FPGA bus without using the processor -  EDN-Design Ideas 04/27/2016    A bit of added hardware lets FPGA engineers access peripherals without having to deal with the processor __ Circuit Design by Noe Quintero

Control an LM317T with a PWM Signal -  02/03/11  EDN-Design Ideas Set a regulator's output voltage under microprocessor control.  The LM317T from National Semiconductor is a popular adjustable-voltage regulator that provIdeas output voltages of 1.25 to 37V with maximum 1.5A current.  You can adjust the output voltage with a potentiometer.  The circuit in Figure 1 replaces the potentiometer with an analog voltage that you can control from a PWM (pulse-width-modulation) signal.  You control this signal with a microcontroller or any other digital circuit.  You can use the same microcontroller to dynamically monitor the output and adjust the LM317T.   __ Circuit Design by Aruna Rubasinghe

Control Brightness of Multiple Displays -  05/30/02 EDN-Design Ideas I recently needed to control nine seven-segment displays for a microcontroller's serial port.  The complication I faced was the need to provide a continuous brightness adjustment for all the digits—from completely dark to fully bright.  I couldn't easily use the obvious solution of a string of 74HC595 serial-to-parallel converters driving the segments through series resistors, because I wou __ Circuit Design by Stephan Goldstein, Analog Devices, Wilmington, MA

Control electrical appliances using PC -  Here is a circuit for using the printer port of a PC, for control application using software and some interface hardware.  The interface circuit along with the given software can be used with the printer port of any PC for controlling up to eight __ Designed by Radio LocMan

Control Frequency Response & Noise In Broadband, Photodetector, Transimpedance Amplifier -  EDN-Design Ideas 07/04/96    Converting the current output of a wideband photodetector to a voltage, minimizing noise, and achieving the desired frequency response can tax the patience of even an experienced designer.  Careful selection and correct application of an op amp can often provide the best and most cost-effective solution.  Choosing and properly applying a transimpedance amplifier for broadband photodetector applications involves understanding trade-offs.  Manufacturers of components for wideband transimpedance applications often spec products only for selected detector diodes.  These components can be prohibitively expensive for all but the narrowest applications.    __ Circuit Design by Michael Steffes, Burr-Brown Corp

Control Inrush Current in AC-Operated Power Supplies -  10/06/11  EDN-Design Ideas Inrush current control circuit for ac operated power supplies.  Large power supplies that operate from ac wall voltage have large input-filter capacitors.  You must limit the inrush current to those capacitors.  Otherwise, the supply may trip the ac circuit breaker, or you may damage the rectifier, filer chokes, or PCB (printed-circuit-board) traces.  The circuit in this Design Idea inserts a current-limiting resistor in the capacitor’s charging path.   __ Circuit Design by Peter Demchenko, Vilnius, Lithuania

Control Intensity of Reflex Optical Sights -  02/21/02  EDN-Design Ideas A popular category of aiming/pointing aids is the reflex, or "red-dot, " sight.  This system finds use in such diverse applications as astronomy, archery, and shooting.  In the reflex sight, light from an internal source-typically a  __ Circuit Design by Stephen Woodward, University of North Carolina, Chapel Hill, NC

Control Isolated 12v Stepper Motor -  09/26/96 EDN-Design Ideas Allows full direction and step control of a12V, four-phase stepper motor from a5V, TTL/CMOS -compatible logic controller.   __ Circuit Design by Martin O'Hara, Newport Components Ltd, Milton Keynes, UK

Control Mains Powered Devices with Low Voltage -  Switch mains powered devices on and off safely and simply with low voltages.   __ Designed by REUK-Renewable Energy UK website

Control Microneedle Etching -  11/27/03  EDN-Design Ideas At its invention roughly two decades ago, STM (scanning tunneling microscopy] created a sensation because it was the first technology to make atomic-scale-resolution imaging a routine procedure.  An essential requirement for the prac __ Circuit Design by Stephen Woodward, Marine Sciences, Chapel Hill, NC

Control Multiple Thermoelectric Coolers -  08/19/99 EDN-Design Ideas Optoelectronic and other components sometimes use a thermoelectric cooler and a thermistor for temperature control.  A typical thermoelectric cooler __ Circuit Design by Frank Effenberger

Control ratiometric or simultaneous power-up of multiple rails -  05/13/04  EDN-Design Ideas Many applications use FPGAs, ASICs, or DSP chips, which usually require multiple voltage rails, typically twothe core voltage and the I/O voltage.  The core voltage is usually lower than the I/O voltage.  Guidelines for determining __ Circuit Design by Dirk Gehrke, Texas Instruments, Freising, Germany

Control Room Light Intensity Digitally -  11-Nov-04 EDN-Design Ideas Many people favor different light and temperature settings for different rooms depending upon their mood or whether they are working or relaxing.  The circuit in Figure 1 controls the intensity of the artificial light in a room and  __ Circuit Design by Donal McNamara and Kieran Kelly Analog Devices, Limerick, Ireland

Control shuts down data-acquisition systE - M -  One of the most effective ways to reduce circuit power is to shut down unused components.  Some circuits with power-shutdown capability reduce supply current 1000-fold compared with normal operation.  Placing data-conversion and support components in shutdown between conversions or when conversions are unnecessary significantly reduces supply current and average dissipation.    __ Circuit Design by Kevin Hoskins, Linear Technology Corp, Milpitas, CA  March 14, 1997

Control Slew for Stepper Drive -  03/14/97 EDN-Design Ideas The circuit in Figure 1 provIdeas slewing control for stepper motors that you use in sophisticated applications, such as monochromator movements in optical experiments.  The LM331 VFC plays a vital role in this circuit.  The constant 10V dc from the IC9596 voltage reference routes to the VFC through the DG303 CMOS switch.  The DG303's __ Circuit Design by J Jayapandian, IGCAR, Tamil Nadu, India

Control Stepper Motors In Both Directions -  03/18/10 EDN-Design Ideas :Logic signals turn motors on and off and change direction.    __ Circuit Design by Vladimir Rentyuk, Modul-98 Ltd, Zaporozhye, Ukraine

Control stepper-motors -  8-Jan-04 EDN-Design Ideas Stepper motors are useful in many consumer, industrial, and military applications.  Some, such as personal-transportation systems, require precise speed control.  Stepper-motor controllers can be simple(Figure 1), but they require a variable-frequency square wave for the clock input.  The AD9833 low-power DDS(direct-digital-synthesis] IC with an on-chip, 10-bit DAC is ideal for this task, becaus __ Circuit Design by Noel McNamara, Analog Devices, Limerick, Ireland

Control stepping Motor via USB interface -  This is an example that demonstration how to control some devices via USB interface.  The PC software program with delphi.  Feature : CPU PIC18F4550 with full speed USB interface at 48MHz USB 2.0 compliance Use on-chip USB driver Control 1 stepping

Control stepping Motor via USB interface -  This is an example that demonstration how to control some devices via USB interface.  The PC software program with delphi.  Feature:, CPU PIC18F4550 with full speed USB interface at 48MHz.  , USB 2.0 compliance, Use on-chip USB driver

Control the Rate of Voltage Change Across a Capacitor or Another LoA - D -  09/22/11  EDN-Design Ideas The output rate of change servos a pass FET.   The circuit in this Design Idea lets you set a well-controlled voltage rate of change, often expressed as the differential dV/dt (instantaneous rate of voltage change over time in volts per second).  You can vary the sensitivity with a potentiometer.  Set the dV/dt from 1V/200 nsec to 1V/3 msec.  The input voltage can range from a few volts to 30V.  Higher-voltage transistors can be used to increase the upper voltage limit.  The circuit precharges a capacitor with a slow and controllable dV/dt to avoid a large inrush current during power-up.  You can also use the circuit to create a high dV/dt for susceptibility testing on other circuits. __ Circuit Design by Fabien Dubois, Ampere Lab, Lyon, France

Control the voltage of a remote load over any length of copper wire -  EDN-Design Ideas 08/31/2015    Read about how a unique component compensates for DC conductor loss without using extra sense wires __ Circuit Design by LTC Design Note

Control Variable LED Intensity -  The circuit below uses power from four rechargeable AA NiMH
cells to drive 3 white LEDs.  A potentiometer varies the duty cycle of a pulse width modulator circuit to vary the intensity of the LEDs from 0% to 100%.  The beauty of the circuit is that when the . . . Hobby Circuit designed by Dave Johnson P.E.-September, 2009

Control Your Holiday Lights with a Magic Wand -  12/16/11  EDN-Design Ideas A magnet waved past a Hall-effect sensor does the trick.  This circuit allows you to turn on your holiday bulbs with a wave of the magic wand.  The strings flash in sequence.  At the heart of the idea is the magnetic wand.  It gives the appearance of real magic.  The main part of the circuit is a digital magnito-resistive sensor IC4 (Figure 1).  Typical Hall-effect sensors are not suitable for this design because they do not work over an extended sensing distance.  They also do not switch when excited by either magnetic pole.  The Honeywell 2SS52 sensor works from either the north or south pole.  It has good sensitivity to a magnetic field.   __ Circuit Design by Vladimir Rentyuk

Controlled Up/Down Ramping Light -  There are times when you want a lamp to gradually change from dark to light and from light to dark, with each push of a pushbutton switch.  The circuit below performs this control function using a flip/flop and a classic pulse width modulation or PWM . . . Hobby Circuit designed by David A. Johnson P.E.-March, 2009

Controller easily evaluates 2-bit gray code -  06/19/97 EDN-Design Ideas Paired with a simple controller, 2-bit quadrature, gray-encoded rotary switches can easily provide continuous indexing functions for incrementing/decrementing and other applications.  For example, the eight-pin 12C508 controller (Microchip Technology, Chandler, AZ) can evaluate the encoder's outputs approximately every 120 µsec using the controller's internal 4-MHz clock (Figure 1a).  Even in small quantities, the 12C508 costs $1.50 and thus provIdeas an inexpensive and small design for this application.    __ Circuit Design by William Grill, NavRadio Corp, Littleton, CO

Controller for a 9v Powered Xenon Photoflash -  This 9v battery powered circuit is designed for remote control flash needs.  A charge control circuit turns off the high voltage generator when the photoflash capacitor is fully charged.  A neon lamp is included to indicate when the system is ready to flash . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

Controller for Christmas Light Shows, Pt.2 -  Everyone who has seen this has been pretty impressed and no wonder! While we originally intended it to make your Christmas Lights display the best in your suburb, with up to 32 channels and total power limited only by your power outlets, it's capable of controlling just about any lighting sequencing task you want to throw at it.  Now we get on with the good stuff: putting it all together!__ SiliconChip

Controller for Christmas Light Shows, Pt.2 -  Christmas is just about here! Have you got your Digital Lighting Controller ready yet? In the first two articles we explained how the Digital Lighting Controller works and how to build it.  This third article explains how to use the softwareprimarily the Windows-based sequencing program.__ SiliconChip

Controller for Hybrid (Photovoltaic-Wind Turbine & Diesel Engine) Power Plant -  Figure 1 shows the block diagram of the HPP, comprised of 440 Wp photovoltaic modules, 1 kW wind turbine and 5 kW diesel engine as a back- up. 
HPP is a centralized PV and wind power generation plant, using battery to store the produced dc current electricity.  To cater for emergencies, a
conventional diesel generator is also provided.  The main component on HPP is the controller, an electronic device which automatically control when the
back- up diesel engine shall start assisting with producing electricity __ Designed by Didik Rostyono rostyono @ webmail.bppt.go.id

Controller for rotary film processor -  If you want to develop your color film, and specially slides, at home, here is the machine you need! __ Designed by Manfred Mornhinweg

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Control Circuits:   #'s - A       B - C       D - G        H - L       M - P        Q - S        T - U        V - Z


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