Top Circuits Page 152
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555 Timer Sound Effects Videos 1. This is Make website light theremin with 555 timer. Good spooky Halloween 3. film countdown 4. uHD chessboard timer karo black & 5. I made this tiny noise machine based on Forrest Mims` Engineer`s....
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Colour Organ Videos Complete instructions this episode Weekend Projects can be found Fifteen years ago I bought a box from my uncle Here`s what it does....
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Power Diagram Videos DIY Solar Panel System Wiring Diagram. This is an exact diagram how Power Window Wiring Diagram 1 Amazon Printed Books Power Door Locks & Wiring Diagram Amazon Printed Books....
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The original power supply AC-3400 with charger function. Except for the button and the indicator of inclusion, on the forward panel there is an indicator of a level of a charge of the accumulator, a start button, and a socket for connection of the....
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Circuit and assembly process of the line stage in two separate articles. The linestage shares the same circuit with the two chassis version which was already presented. Only this time power supply and preamp will be in one housing which will be in the same....
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Octal Preamplifier can also be built as a stand alone unit without the linestage part. This is not feasable since it has a split RIAA, which means the RIAA EQ circuit is split into two parts, one after the first stage and another one after the second. This....
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These circuits are often used in robotics to allow DC motors to run forwards, backwards and to give electric break(short circuit condition). H bridges are available as integrated circuits, or can be built from discrete components as figure 1...
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I went with electric because it`s quieter, not smelly and I can carry it up a flight of stairs. I chose the conversion kit made by Currie. Factory service is nonexistent, but EVdeals is a good, knowledgeable dealer. The motor delivers more than ½ horsepower....
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The NiMH battery chemistry is a topic which, for most of us, is shrouded in mystery. Myths seem to form a large part of what this chemistry is about and how it should be treated or not treated as the case may be. The following script lists and explains a....
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A video of my friend James playing his electric guitar, patched through the audio echo effect system, and then to his amp. I didnG ‚¬ t make any effort to prove that this isnG ‚¬ t a conspiracy, so youG ‚¬ ll have to take my word that the echo effect is....
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The code in mikroC PRO for PIC16F887, with 8. 0000 MHz clock for microchip 44 pin Demo board, the routines have been written from microchip in HITECH C, since I am working and have programmer and software from mikroE I am interested to go with that only,....
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A series capacitor worked best for low impedance loads while a parallel capacitor was used to feed into high impedance loads. Today`s norm is a 50 ohm antenna antenna/coax system requiring a series capacitor. loading adjustment. With SW3 I can switch out the....
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This circuit is easy to build and uses standard components available at any Radio Shack store. It accepts the audio tone output of a code practice oscillator or short wave receiver and converts those tones into the DC voltage necessary to operate an old-time....
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Photos, detailed descriptions and schematic diagrams of W2DTC`s homebrew 3CX3000F7 triode HF linear RF amplifier....
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3CX3000F7 Plasma amp conversion to 40 meters, including photos and descriptions....
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This is the working prototype. The eagle files have some minor changes made to it. Fixed some mistakes and re-positioned a few parts. This one is for the phreakers of the past. A simple Arduino shield to decode DTMF tones using an audio input. It can easily....
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The full wave phase control circuit below was found in a RCA power circuits book from 1969. The load is placed in series with the AC line and the four diodes provide a full wave rectified voltage to the anode of a SCR. Two small signal transistors are....
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This 2 channels audio mixer is based on the 2n3904 transistors which forms 2 preamplifiers. The first preamplifier of the audio mixer has a high gain and can be used for microphone input, and the second one can be used to control the input of the audio....
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As we presented in another article the A3952S integrated circuit ( designed by Allegro MicroSystems ) can be used to design very simple and useful motor driver circuits. In the precedent article was presented a simple bipolar stepper motor driver circuit....
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Digital clock project based on the PIC16C54 microcontroller can be designed using the following circuit diagram. This digital clock electronic project based on the PIC16C54 is a simple time-of-day clock incorporating four seven-segment LED displays and three....
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The circuit was designed to create an electronic siren to provide a scheme for producing an alert sound in emergency cases or any circumstances that requires its usage. 4011 a quad 2-input NAND gate integrated circuit, generally characterized by small....
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This white LED Driver circuit project is based on the NCP5680 high efficiency white LED Driver ic. NCP5680 supports double power flash LED and torch operation. The built-in DC/DC converter is based on a high efficient charge pump structure with 1X, 1. 5X and....
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This is same circuit as above with the addition of a photo resistor to trigger the flip flop instead of a push button. The bias resistor in series with photo resistor was chosen so that sufficient voltage is present at the base of the 2N3904 to supply....
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Clock timer uses a PIC16F628 microcontroller to display 3 and 1/2 digit time and control an external load. The clock includes a calendar with leap year and optional daylight savings adjustments. The timer output can be set from 1 to 59 minutes and manually....
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A very simple 4 channel video amplifier electronic circuit project can be designed using NJM2582 ic suitable for video applications with SCART connector. Design of the circuit is very simple and require few external electronic parts. Some features of the....
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Normally analogue-to-digital converter (ADC) needs interfacing through a microprocessor to convert analogue data into digital format. This requires hardware and necessary software, resulting in increased complexity and hence the total cost. The circuit of....
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Many SWR / Power meter used by amateurs to the extent reasonably accurate continuous average power with a CW key-down signal, but can not reliably be used with other (modulated) signals PEP or average power measurement. These laws seek to show why the power....
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This simple circuit shown int the schematic diagram actives the switch using sound. We can use this circuit for various applications, such as automatic (sound-controlled) disco light or car`s LED light show. The Q1 amplify the audio from mic. The R1 is used....
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A sensitive detector for static electricity based around a single Field Effect Transistor It can also be used to detect the presence of negative ions, or test a negative ion generator. This circuit utilizes the extra high input impedance of a FET, and also....
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The LM48824`s Stereo Headphone Amplifier (Class G architecture ) increases audio (MP3, mobile TV, etc. ) playback time with its adaptive power supply approach that enables very low supply rails, which doubles the power-efficiency compared to typical Class AB....
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LH0024 IC small signal IC designed for general purpose switching and amplification due to its low voltage, low voltage and three different win the election 1N4148 silicon small signal diode planar epitaxial used for fast switching applications with a reverse....
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This volume controller equalizer electronic project is designed using LM1036 DC tone volume controller with volume and balance circuit for stereo applications. An additional control input of the LM1036 allows loudness compensation to be simply effected. The....
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This high voltage white LED driver electronic circuit schematic is based on the NCP5021 IC manufactured by On Semiconductor. This NCP5021 high voltage white LED driver electronic circuit is designed with ambient light sensing feature. The NCP5021 white LED....
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With an integrated voltage regulator connected reverse to a mini drill can be adjusted speed within certain limits so that it remain constant, independently of load. In the scheme presented below the electronic speed control is made by a voltage regulator,....
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A photo or slightly activated relay normally open relay in the closed circuit / contact with the light. In this circuit, a photodiode is used to sense light. The photodiode has a high resistance in the absence of light strikes. The photodiode is connected to....
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Today we would like to offers solutions for a set time for take control relay and take NO. / NC. contact to apply to control other devices. such as disable or enable the device. function of this circuit is using IC555 to determine the pulse and a resistor R1....
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The main part of this circuit is the LM386 amplifier chip. It also uses a transistor input to buffer the input signal and provide extra gain for the LM386. The little unit has helped me out on numerous occasions when trouble shooting any amplifier circuit....
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Using LM833 can be designed a very simple tone control circuit using few external components. For this Lm833 ton control circuit can be used almost any type of operational amplifier if it have high input impedance. The LM833 is a is a dual general purpose....
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This project describes a digital clock with alarm function. It uses a PIC16F877 microcontroller to generate an accurate 1 sec delay with Timer0 using Roman`s zero error method. The time is displayed in large size font on a 4G—20 character LCD that uses....
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The latest addition to my collection of Infra Red (IR) Repeater circuits. The Mark 5 is a much improved version of the Mark 1 circuit and has increased range and sensitivity. It is also immune to the effects ofambient light, daylight and other forms of....
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This Line Following Robot sensor or surface scanner for robots is a very simple, stamp-sized, short range (5-10mm) Infrared proximity detector wired around a standard reflective opto-sensor CNY70(IC1). In some disciplines, a line following robot or an....
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This circuit uses the popular and easy to find LM3914 IC. This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almost every source. This circuit is very easy to explain: When the test....
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The multimeter should be set to the lowest dc volts range for maximum sensitivity. This is normally 200mV DC for most meters. The circuit works well at VHF (around 100MHz) and was quite pleased with the results. L1 was 7 turns on a quarter inch former with....
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A very simple TV audio video transmitter circuit can be designed using this schematic diagram. This TV audio video transmitter circuit can be used to transmit video signals from VCR ( or some other device ) to a TV without using any cable. Video signals....
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This circuit confuses the infra-red receiver in a TV. It produces a constant signal that interferes with the signal from a remote control and prevents the TV detecting a channel-change or any other command. This allows you to watch your own program without....
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A photodiode Dl feeds high gain IR remote control preamp 1C, a CA3237E. U2 is a PLL FM detector tuned to around 100 kHz. The detector output is amplified by U3 and it can drive a speaker or a set of headphones...
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This 1000 watt power inverter circuit diagram based on MOSFET RF50N06. If you want more power then add additional MOSFET paralleled at RF50N06. This MOSFETS are 60 Volts and 50 Amps as rated. It is necessary to connect a FUSE with the power line and always a....
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4027 a dual JK flip flop that has independent clock, set, and reset inputs for each flip flop used in toggle, register, and control functions due to its features such as capability of driving two low power TTL loads, logic edge clocked flip flop design,....
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This project involves the construction of a low-cost curve tracer that is suitable for testing a wide variety of electronic components both in-circuit and out of circuit. It is easy to construct and extremely useful for finding defective parts, especially....
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This is a simplest circuit for 100 watt inverter for generating 220vAC from 12vDC. I say simplest because here in this inverter circuit a minimum number of components are used to design the schematic, which is quite difficult to make a circuit like this with....
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The 555 can be used as an amplifier. It operates very similar to pulse-width modulation. The component values cause the 555 to oscillate at approx 66kHz and the speaker does not respond to this high frequency. Instead it responds to the average CD value of....
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This stereo balance indicator circuit diagram is designed using few common external components. The schematic circuit is very simple to build and will provide an visual indication with LEDs for left, right and center balance. Outputs from each channel are....
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This electronic infrared adapter serial transceiver circuit is based on a TFDS4500 IC and can be used to transmit data from portable devices to a PC using IR and serial port. TFD4500 infrared adapter it`s a low power infrared transceiver modules for serial....
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Using electronic scheme below can be designed a zener diode tester using few electronic parts. Using this zener tester and a multimeter can be measured and determined with a high precision threshold voltage of a zener diode. Zener voltage can be read with a....
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This DC to AC inverter circuit work based on unstable multi vibrator does. In this circuit, IC CD4047 is chosen as a heart of unstable multivibrator, because this IC type gives a complementary output that has opposite phase to another ( pin 10 and 11 as seen....
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Because of energy crisis Load shedding may be a common problem in several countries. Sudden power fluctuations, surge and high voltage may spoil sophisticated household appliances like TV, VCR, VCP and music system. This circuit provides protection against....
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This circuit controls resistive and inductive loads up to 2, 500W. It`s main functional device is an integrated phase control circuit - Siemens TLE3103. It contains its own power supply, a zero voltage crossing detector circuit and a logic driver. An....
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This simple Door Chime protects the door and gives a loud Alarm tone when there is an attempt of theft. The circuit is too simple and battery operated. A Normally Closed (NC) reed switch and magnet is used to trigger the circuit. Alarm generator is the....
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This document describes a Rife Beam-Ray system which was designed and constructed using the latest information available about Royal Rife`s actual frequencies. This system uses a novel method of generating the proper modulation frequency for the 3. 1 MHz....
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A relay is an isolated switch, there is no connection between the switching device and the connection. Relay is often used when controlling high voltage devices so that the intricate low voltage devices will not be damaged. There are many types of relays but....
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On the Uno boards, there`s an IC which is responsible as a USB to serial converter and it makes it possible to program the Arduino and also communicate with it from the computer. The problem here is the IC is an SMD (Surface Mounted Device). The R3 uses an....
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For maximum mini-security this RC Tupperware Turret packs a powerful punch. It may not have motion sensors, but food thieves will still think twice before swiping your baked goods. The 11-hour project, built by Chris of PyroElectro, was designed to be as....
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This little project aims to create a USB CD-ROM device. Unlike the typical deviced which tries to imitate this isn`t a real CD-ROM drive, it just emulates it. The idea is to allow the user to store a ISO image or other kind of CD-ROM image in a SD card to....
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A footstepping effort-based locomotion interface is described. Built around an inexpensive and readily-available exercise machine, it provides an effective interface to walk-through VEs....
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With the inspiration from lab 3, Digital Waveform Synthesis, I want to make a project that can process and playback music. Some songs are pre-stored in memory. They can be played back just like a real piano keyboard. Also the user can input a song on a....
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I decided to make one for $45 in parts. Judging from the components I ended up using, one can tell. The motors and tires were salvaged from a broken electric wheelchair, the metal was scrap, the battery surplus from a garage sale, all the circuits....
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The resistors R18 and R22 that should have been connected to pin 8 of U4 were mistakenly connected to pin 9. The present versions have been corrected. A minor error on the component layout is that there are two versions of C2, in the upper right and lower....
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Imagine being faced with a dozen or more cable ends, all the same colour and bearing no identification. The other ends emerge in another part of the building, and you have no way of knowing which is which. You could use a continuity tester and a long length....
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The supply generates a low voltage (<18 Volt) low current 3 phase sinosoidal waveform. This waveform is used to switch high power MOSFETs on and off producing a 3 phase high current square wave output. Yes. yes you`ll get all sorts of harmonics and noise....
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A couple of changes on the dead band and Pulse Stretcher resistors, and the Position feedback potentiometer has been hacked around to function as a "zero the speed" or "center your transmitter sticks". The rest is just the addition is a fairly traditional....
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For those of us that cannot afford the high cost of some of these SDR radios there is hope. Here I describe an I. F. converter suitable for use with Boat Anchors Communications receivers. Now it is possible to couple the great front ends of an R390 or SP600....
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A wideband circuit design of a Double Sideband Exciter. The circuit can be used to generate a low level signal with suppressed carrier or with any percentage of carrier injection that is desired. The circuit is simple and will easily provide an output 1 v....
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This project is based on USB to serial converter FT232XX chip series. These chips can convert the USB protocol to asynchronous serial protocol. In other words, you can use the chip for convert for example USB1 port to the correspondent serial port. These....
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Circuit is very simple and straightforward. Two inputs are added just to give an idea of input control and software denouncing. An ATMEL Micro-controller AT89C2051 is used to control the LED glowing one by one to give the effect of running light. A 12 M Hz....
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This schematics show a digital thermostat designed for controlling ambient temperature inside a house. Thermometer display temperature in 0C. 99. 9C range and the thermostat can set a temperature in 0. 99C range. The temperature real range is between 12C and....
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The laser diode will be forward biased and its cathode (LDC) will connect to a driver transistor &/or network to regulate the LD current based on the photodiode current (feedback network)...
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An LCD -liquid crystal display is an electronically-modulated optical device made up of any number of pixels filled with liquid crystals and arrayed in front of a light source (backlight) or reflector to produce images in color or monochrome. The block....
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This simple AVR Programmer will allow you to transfer hex programs to most ATMEL AVR microcontrollers without sacrificing your budget and time. It is more reliable than most other simple AVR programmers available out there and can be built in very short....
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The Infrared emitter detector circuit is very useful if you plan to make a line following robot, or a robot with basic object or obstacle detection. Infrared emitter detector pair sensors are fairly easy to implement, although involved some level of testing....
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Considering the technical requirements defined in the previous topic as the starting point, this topic will explain in detail the design of every block of the radio frequency (RF) front-end. To accomplish a design that fulfils specifications, the design is....
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This circuit is intended to signal, through a flashing LED, the exceeding of a fixed threshold in room noise, chosen from three fixed levels, namely 50, 70 & 85 dB. Two Op-amps provide the necessary circuit gain for sounds picked-up by a miniature electret....
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This projects builds upon the 2012 LED Flicker project. The goal is to build an ultra bright, multi-channel test light using extremely high power LEDs driven to their maximum rated current, and controlled precisely. By driving an array of 7 ultra bright....
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