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Control Circuits

 
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Last Updated: October 24, 2017 02:54 PM

Circuits Designed by Dave Johnson, P.E.

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 . . . Hobby Circuit designed by David Johnson P.E.-July, 2000


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

Detects Xenon Lamp Flash -  This circuit has a very low standby current requirement yet has very high sensitivity toward the light flashes from a xenon lamp.  When connected to a flip/flop it can serve as an on on/off Controller . . . Hobby Circuit designed by David A. Johnson P.E.-December, 2004

Device Control using DTMF -  Controlling devices using switches are common.  From a few decades controlling devices using remote control switches like infrared remote control switch, wireless remote control switches, light activated switches are becoming popular.  But these technologies have their own limitations.  Laser beams are harmful to mankind.  

DI Nocturnal Solar Engine -  The D1 solar engine is the original nocturnal solar engine design.  The design is simple, tuneable, but no longer terribly useful (I include it here just for purposes of education and folks' historical interest).  This design has a number of weaknesses; courtesy of Wilf Rigter, here are a few: __ Contact: Eric Seale

DIAC-Controlled Flasher -  This simple flasher finds various industrial applications as a high-voltage indicator or machine-’on’ indicator.  It flashes once every second to give a warning indication.  It is simple to design and can...__ Electronics Projects for You

Dice -  Press the push switch to 'throw' the dice: this makes the circuit rapidly cycle through the dice numbers so that an effectively random dice number is displayed by the LEDs when the push switch is released.   __ Designed by John Hewes

Digi Pack DMX 512 Lighting Controller -  This is a design for a digital lighting controler.   __ Designed by Paul Harris

Digital & Binary clock with thermometer & hygrometer -  Here we have a clock.  It's not another clock.  It has digital and binary output.  It also has a thermometer and a hygrometer.  It's not another thermo-hygrometer.  It display's absolutely humidity (gr/m 3) also.  Schematic __ Designed by Konstantinos Bellosstyle

Digital Automatic Gain Control AGC -  This project is a digital Automatic Gain Control   (AGC) system using a PIC16F876 MCU.  The ability to set the gain level in a circuit and have it control itself is a very useful function.  This circuit is a building block of another project I am working on.  A 30W power amp for either the PCS, iDEN or CDMA frequency bands.  I will settle on one of those frequencies sometime soon.   __ Designed by steevn.geo @ yahoo.com

Digital Bench Power Supply -  PIC Project  This unit delivers 0 to 20 volts at up to 4 amps in 0.1volt increments.  The entire device runs on a PIC16F870   (about $3 in small quantities).  This is basically a switching power supply with the voltage regulation done in software.  The PIC used here has analog inputs   (used to measure voltage and current) and hardware PWM   (pulse width modulation) output used to control the power.   __ Designed by Luhan Monat-Mesa Arizona

Digital controller compensates analog controller -  02/19/09  EDN-Design Ideas Combine the simple and robust closed-loop control of the digital CLZD010 with the current-limited high-side gate drive of the analog LM3485 for the best of the digital and analog worlds __ Circuit Design by David Caldwell, Flextek Electronics, Carlsbad, CA

Digital Controller for Christmas Light Shows -  Want one up on your neighbours? Instead of a static Christmas Lights display (so passe!) now you can have the ultimate in Christmas extravaganzas.  This amazing controller will bring your Christmas lights to life, making them flash, dim up and down, you name it, all in time with your favourite Christmas music.  It's easy to build, easy to connect and, best of all, easy to program!__ SiliconChip

Digital Delay Unit for Surround Sound The Mitsubishi M65830 Delay IC has been discontinued (for reasons beyond my comprehension) , and so far a suitable replacement device has not been found.  This means (of course) that you will be unable to build this delay circuit.  I have left the project in place as reference, and the overall connection schematic is still valid if (when?) a replacement for the M65830 is located.  The project will be updated at that time.  In the meantime, just ignore the delay circuit __ Designed by Rod Elliott  ESP

Digital Dimming DALI Ballast for 32w/T8 110V Input -  This reference design is a high efficiency, high power factor, digital dimming electronic ballast designed to drive rapid start fluorescent lamp types.  The design contains an active power factor correction circuit for universal voltage input as well as a ballast control circuit using the IR21592.  The design also includes a PIC16F628 microcontroller and an isolation circuit for connecting to a Digitally Addressable Lighting Interface (DALI).  

Digital Dimming DALI Ballast for 36w/T8 220V Input -  This reference design is a high efficiency, high power factor, digital dimming electronic ballast designed to drive rapid start fluorescent lamp types.  The design contains an active power factor correction circuit for universal voltage input as well as a ballast control circuit using the IR21592.  The design also includes a PIC16F628 microcontroller and an isolation circuit for connecting to a Digitally Addressable Lighting Interface (DALI).  

Digital Encoder using Stepper Motor -  Using circuit depicted in the schematic diagram below, the direction and shaft rotation of stepper motor can be seen on the LED display.  Alternative to digital rotation encoder as a digital encoder input, this circuit uses a stepper motor.

Digital LED Lighting Controller for Chrismas Lights -  It's that time of year again when all those Christmas lighting devotees start planning and building their displays for the festive season.  They might have dozensif not hundredsof different light arrays and they will be thinking about buying even more.  Is this you? Have you thought about controlling lots of your lights in time to music? Well now you can!__ SiliconChip

Digital Lighting 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

Digital Lighting Controller for Christmas Light Shows, Pt.3 -  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

Digital Logic Based LED Christmas Tree with 64 LEDs -  The Holidays are once again upon us and we wanted to give our readers the edge in decorating this year.  Continuing our all-digital-hardware theme to coincide with our Kickstarter for a Digital Electronics Course at PyroEDU, we have created an LED Christmas tree controlled entirely by digital logic __ Designed by PyroElectro

Digital noise generator -  When 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 . . . Hobby Circuit designed by David Johnson P.E.-July, 2000

Digital Thermostat with LED Temperature Display -  I needed to replace two old, unreliable thermostats for controlling the heating and cooling for a large garden shed.  Commercial basic digital thermostats are available quite cheaply, but some lack the ability to control heavy loads or have the extra features that I require for saving energy when the door is often left open or to indicate temperature being out of range etc.  I like the PIC18F1320 microcontroller used in my previous project, so decided to use it again in a very similar design to drive three multiplexed LED displays and read the temperature from a Dallas/DS18x20 "1-Wire" digital sensor.   __ Designed by D. Thorpe, 2006

Digital volume control -  The Tiny Audio Amplifier kit is a good choice for battery operation.  It is based on LM386 IC.

Digital Volume Control -  The heart of this digital volume controller DVC circuit is IC2 4067, 16-channel analog multiplexer.  Because the 1kΩ has been connected between every input and output, the multiplexer can act like a potentiometer.  The total resistance is 15kΩ.  You can use different values for the resistor to obtain a different characteristic.   __ Designed by Popescu Marian

Digital volume control -  Circuit of a digital volume control using six discrete ICs, including a 5V regulator, is presented.  IC1 (555) is configured to function as astable flip-flop.  Its frequency or period may be adjusted by proper choice of resistors R44, R45 and capacitor C6 combination.  Here it is for 0.3 second period __ Contact: IQ Technologies

Digital Volume Control -  This circuit could be used for replacing your manual volume control in a stereo amplifier.  In this circuit, push-to-on switch S1 controls the forward (volume increase) operation of both channels while a similar switch S2 controls __ Contact: IQ Technologies

Digital volume control has log taper -  04/11/02 EDN-Design Ideas Digital potentiometers provide a compact and convenient way to attenuate audio-amplifier signals.  However, most such potentiometers suffer from at least one flaw  a nonlogarithmic step increment.  To avoid this problem, a user must usually step the potentiometer in a nonlinear sequence to simulate a logarithmic taper __ Circuit Design by Doug Farrar, Los Altos, CA

Digital Volume Control using DS1669 Digital Pot IC -  This digital volume control has no pot to wear out and introduces almost no noise in the circuit.  Instead, the volume is controlled by pressing UP and DOWN buttons.  This simple circuit would be a great touch to any home audio project.   __ Designed by Aaron Cake

Digital Volume Control with DS1669 -  This is digital volume control circuit which uses DS1669 as the main volume control.  This is stereo volume control, you can use stereo push button switch for to control both channel by together.

Digitally Addressable DALI Dimming Ballast -  A digitally addressable digital dimming ballast has been developed.  It conforms to DALI standard requiring very few parts and operates at very low power.  Applications include building management or studio lighting where it is desired to control single or groups of lamps for conserving energy, performing lamp maintenance or creating prefect light quality.  The design includes the digital dimming ballast, the code of the micro-controller and a platform to control the ballast by PC.   __ Designed by Cecilia Contenti and Tom Ribarich Applications Engineer, International Rectifier, Lighting Group

Digitally Adjustable Dancing Lights -  You might have come across several types of adjustable dancing lights (flickering LEDs).  Most of them use presets (variable resistors) to adjust the rate of switching.  Being a mechanical component, the...__ Electronics Projects for You

Digitally Control Gain over a ±40 DB Range -  09/12/97 EDN-Design Ideas Digitally controlled amplifiers typically take the form of programmable-gain amplifiers (PGAs).  Though useful for many applications, PGAs have the disadvantage of large, discrete gain steps, such as gains of 1, 2, 4, and 8.  For higher resolution gain steps, you must use a different approach.  The circuit in Figure 1 can digitally control an amplifier's gain over a ±40-dB range.  The circuit has a programmable-gain resolution of 1.25 dB and can attenuate or amplify the input signal, depending on the digital code you apply.  You could use this high-resolution PGA as the front end of an ADC and thus obtain increased dynamic range.  The circuit is also useful as a digitally controlled audio preamplifier.    __ Circuit Design by Mark Shill, Burr-Brown Corp, Tucson AZ

Digitally Control Room Light Intensity -  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

Dim 12V Light Bulb with 555 IC -  This light dimmer is used to dim the intensity of 12V light bulbs using the well-known 555 timer that is configured as an astable multivibrator.  The pulses from pin 3 are used to control the VMOS transistor BUZ20, BUZ72 or 10N10.  The maximum dissipated power must not exceed 40 watts.  You may use the transistor without a __ Designed by Popescu Marian

Dimension Control -  Add an effective New Dimension to your Stereo sound, Increase Seperation and Reduce Noise.   __ Designed by G.L. Chemelec

Dimmable LED Desk Lamp -  This circuit was used to convert a portable fluorescent desk lamp to LEDs.  It is dimmable from "night light" level to "retina burner" level.72 high-brightness LEDs put out a lot of light.  Without a diffuser, the light output is very directional, like __ Designed by Andrew R. Morris

Dimmable LED Desk Lamp -  30-Nov-12 -Design News:   Andrew Morris designed a dimmable LED driver circuit that is simple and energy efficient.  He then installed the circuit into a portable fluorescent lamp. __ Designed by Andrew R. Morris, Gadget Freak-Case #230

Dimmer Switch -  The following circuit is a simple circuit layout for a light dimmer constructed with basic electronic components.  The light dimmer circuit is built using components such as diodes, resistors, wires and capacitors.  The main principle in the working of a dimming circuit is to charge the capacitor first using the power source and then let the capacitor discharge slowly.  This makes sure that the wattage is decreased at the source to which the lighting dimmer is attached.  __ Lighting Unlimited Company

Dimmer/Motor Speed Control -  Lamp dimmers using traics can be quite simple,   nothing more than a potentiometer, resistor, capacitor and TRIAC with a built-in diac.  (See Teccor's App Note for examples and other technical data.) The circuit below is similar __ Contact: Charles Wenzel of Wenzel Associates, Inc.

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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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