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Control Circuits

 
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Last Updated: October 09, 2017 03:39 PM


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

Valentine Heart -  18 LEDs flash at three different rates and you can use these to create an eye-catching Valentine Heart for that special person! A template for the heart shape can be downloaded.  The circuit is kept simple (and low cost) by using the 4060B IC which is a counter and oscillator (clock) in one package.  The circuit requires a 9V supply, such as a PP3 battery __ Designed by John Hewes

Variable Threshold Solar Engine -  The VTSE uses the popular 1381 chip and that is its main advantage.  The potentiometer (or two fixed resistors) connects one leg between the output and input of the 1381 and the other leg to the supply voltage.  These resistors acts like a voltage divider when the SE is off and the 1381 output is low.  In that case, the voltage that appears at the 1381 input is determined by the ratio of the pot or the two resistors and is usually set for 2 times rated 1381 voltage.   __ Designed by Wilf Rigter

Varying Brightness AC Lamp -  In this circuit, an SCR is used to slowly vary the intensity of a 120 volt light bulb by controlling the time that the AC line voltage is applied to the lamp during each half cycle.  The circuit is directly connected to the AC power line and should be placed inside an enclosure that will prevent direct contact with any of the components.  To avoid electrical shock, do not touch any part of the circuit while it is connected to the AC power line.  A 2K, 10 watt power resistor is used to drop the line voltage down to 9 volts DC.  This resistor will dissipate __ Designed by Bill Bowden

Versatile 3-Channels Radio Remote Control -  A radio controlled remote control, suitable for driving up to 3 loads using relays.  With a 6 keys transmitter __ Designed by Projects & Ideas from Nutchip.com

Versatile Miniature High-Rate ESC with BEC & Brake -  This electronic speed control (ESC) for brushed motors combines the features of two of my earlier designs.  One was a high-rate 30A ESC with a brake, and the other a high-rate 12A ESC with a BEC (receiver battery eliminator circuit).   __ Designed by Stefan Vorketter

Versatile Water Level Controller -  This simple, economical and versatile circuit switches on the motor pump when water in the overhead tank falls below the lowest level and turns it ‘off’ when the tank is full....__ Electronics Projects for You

Version a of 1.5v LED Flasher -  To squeeze even more energy from a alkaline battery cell, this circuit adds two transistors to a circuit similar to the above design to boost the efficiency.  A small 1.5 volt alkaline N cell should flash the LED for a full year.  It too uses a "charge pump" technique to provide a LED the needed voltage. . . Circuit by Dave Johnson P.E.-June, 2000

Video Design Idea: Buck regulator controls white LED with optical feedback -  10/25/07  EDN-Video Design IdeasBy using optical feedback, you can stabilize the output level of a high-intensity LED __ Circuit Design by Dhananjay V Gadre, Netaji Subhas Institute of Technology, New Delhi, India

Video/Audio Wireless Transmitter -  To design and build a wireless transmitter that works over the FM frequency and allows the transfer of a video/audio signal over a certain distance to a FM tuner.  circuit diagram and project description

Voice activated switch -  The VS-1 provides quality components and a compact printed circuit board that makes it a snap to turn on a multitude of devices, from HAM transmitters and amps to tape recorders or clandestine listening equipmentHAVE FUN!

Voice activated switch  -  This circuit uses an MC2830 to form a voice activated switch (VOX).  A traditional VOX circuit is unable to distinguish between voice and noise in the incoming signal.  In a noisy environment, the switch is often triggered by noise, or the activation sensitivity must be turned down.  This circuit overcomes this weakness.  The switch is activated by voice level above the noise and not activated by background noise. __ Contact: IQ Technologies

Voice identifier for a repeater station -  Designed as a drop-in replacement for the VHF Engineering repeater's CWID, it can be used in other equipment too. __ Designed by Manfred Mornhinweg

Voice Operated Switch -  Description This circuit is a voice operated switch (VOX) and designed for audio frequencies within a commercial telephone bandwidth of 100Hz to 3000Hz.  Input amplitude is sensitive down to 10mV and the output comparator can drive a relay or interface to micro processors and TTL switching between 0 and 5Vdc.  Notes The VOX circuit is […]

Voice Recorder & Playback SystE - M -  There are several types of voice recorder and playback systems available in the market but most of them are expensive and their circuits are also very complex to assemble.  Here is...__ Electronics Projects for You

Voice-Controlled Home Automation SystE - M -  This is a project for a voice controlled home automation system to control appliances with your voice through an Android app.  An Arduino Mega board is used for controlling the relay...__ Electronics Projects for You

Voltage Booster (Very Simple) -  Uses a LT1372 and only a Few partsBut can handle 1.5 amps Input Current.  Input as low as 3 VoltsOutput may be as high as 35 Volts __ Designed by G.L. Chemelec

Voltage Clamps for ultra-low-voltage apps -  Today's electronic systems oftenmade to simulate a low-power Zener shunt regulator, using two parallel-The precise, ultra-low gate threshold voltage is used to control the sharp, fast  __ Advanced Linear Devices, Inc

Voltage comparator switch -  This circuit will provide an indication whenever the input voltage differs from two defined limits, V1 and V2.  The supply voltage, Vcc must be higher than the highest input voltage by at least 2 volts.  One application here is to monitor a 12V car battery __ Designed by Andy Collison

Voltage controllable LFO -  This voltage-controlled LFO is based on the PIC 16F684, which is a pretty basic chip.  Nonetheless, this LFO has more features than your average LFO.  For a start, it can produce 7 basic waveforms, and also includes a noise source.  It can also morph its waveforms under CV control, well beyond basic PWM

Voltage Controlled Panner -  pans audio left and right __ Designed by G. Forrest Cook

Voltage Controlled Solar Engine -  Voltage-Controlled Solar Engine: These designs are based on the Motorola MC34164-* micro power undervoltage sensing ICs.  They're pretty efficient, work at higher voltages than most solar engines, and can provide voltages for other logic circuits (say, a microprocessor).  This page hosts the original Chloroplast by Craig Maynard, as well as some Chloroplast variants by Wilf Rigter.   __ Designed by Craig Maynard

Voltage Regulator controls scanner Lamp brightness -  05/13/99 EDN-Design Ideas An image-scanning device performs best when the scanner IC controls the brightness of the image reflected into the light sensors.  The best way to control brightness is by adjusting the intensity, or light output, of the fluoresce __ Circuit Design by Chester Simpson, National Semiconductor, Santa Clara, CA

Voltage-Based Controller for Switches -  Here’s a simple circuit for controlling four switches from a distance through just a pair of wires.In the circuit, the inverting inputs (pin 2) of operational amplifiers IC1 through IC4 are...__ Electronics Projects for You

Voltage-doubling Solar Engine -  The Vx2SE is a simple discrete voltage-doubling SE for driving an LED.  If the load is a red or green LED, J1 is used together with just one red or green LED for threshold detection (no 1381).  For driving a blue LED use two green or red LEDs in series and may require a higher voltage (3V) solar cell.  With 100uf capacitors the flash frequency is 2-3Hz and the R2 and R3 resistors may be omitted.  With very large capacitors (0.01F and up) the frequency is much lower and the resistors can be optimized to stretch the LED "on" time.  The Vx2 solar engines will self trigger but are also sensitive to a drop in light and will trigger from a shadow etc.   __ Designed by Wilf Rigter

Volume Control -  A volume control using a linear pot that is much better than most log pots __ Designed by Rod Elliott  ESP

Volume Control -  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

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 __ Designed by Aaron Cake

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

Volume unit meter spans 60 DB dynamic range -  11/10/05 EDN-Design Ideas An audio volume-unit meter displays peak-related audio amplitudes to aid in accurately setting recording levels or for displaying an amplifier's operating conditions.  A simple diode and capacitor network provIdeas a classic volume-unit meter's peak-weighted response, but the circuit typically limits response to about 23 dB of displayable dynamic range, and the meter suffers from errors that its pointer's inertia and mechanical "ballistics" introduce.  Contemporary displays eliminate the inertia problem by using arrays of lighted elements to form bar graphs, but any shortcomings in response and accuracy characteristics now shift to the signal-processing domain.   __ Circuit Design by Jon Munson, Linear Technology Corp, Sunnyvale, CA

VTSE: Variable Threshold Solar Engine -  Voltage-Controlled Solar Engine: The "Variable Threshold Solar Engine" is Wilf Rigter's 1381-based design -with a variable "trip" threshold.   __ Designed by Wilf Rigter

Vx2SEType 1 (Voltage Controlled) Solar Engine -  The VTSE uses the popular 1381 chip and that is its main advantage.  The potentiometer (or two fixed resistors) connects one leg between the output and input of the 1381 and the other leg to the supply voltage.  These resistors acts like a voltage divider when the SE is off and the 1381 output is low.  In that case, the voltage that appears at the 1381 input is determined by the ratio of the pot or the two resistors and is usually set for 2 times rated 1381 voltage.   __ Designed by Wilf Rigter

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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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