Top Circuits Page 127
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Diagram below shows a simplified diagram of the main peripherals present in the 89S52 or 8052 / 8051. There are 3 Timers/Counters in the 89S52. The expression "Timer/Counter" is used because this unit can act as a Counter or as a Timer as per requirement.....
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This circuit is an oscillator, and is able to generate a sound wave, a tone. The tone`s frequency (if it`s a high or low sound) is controlled by the variable resistor. The sound volume of this circuit is considerable so, don`t put your ear too close to the....
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I built a simple 1KHz 6Vpp Sine Wave Generator from a handful of opamps and passives I had laying around. You can check out that project here. I thought it would be fun to quantify just how good of a Sine Wave this circuit was; after all it was just a....
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A simple low end Audio Function Generator. I want to be able to use the Sine Wave output to test ADC resolution and as a base band signal for RF projects and having very Low Total-Harmonic-Distortion (THD) would be nice. So I`ve decided to build my own....
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An analog output for my Arduino. The most common way to build a DAC is to use a R-2R ladder circuit. However, this DAC has no output buffer, which would make this circuit a bit more reliable and working with all kinds of loads. For the best results, you....
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Microchip has announced the availability of new PIC16F1512 and PIC16F151213 XLP microcontrollers. These new XLP (EXtreme Low Power) microcontrollers feature....
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Power Integrations announced a new reference design (DER-278) based on the company s single-stage LinkSwitch-PH LED-driver IC family. The new design....
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Texas Instruments introduced TPS54618, 6-A step-down SWIFT DC/DC converter. The new TPS54618 monolithic synchronous switcher with two integrated 12-milliohm....
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Moisture deposited on a surface bridges across a grid of wires or circuit board traces. A circuit measures the AC ohms resistance through the grid. - Warm wet weather promotes fungus and insect pests of plants. - Quick detection of rain can be used in....
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The datapath contains registers, an ALU, and an internal system bus. Registers are very fast memory locations that are internal to the CPU and separate from the main system memory. They can be used as "scratch pads" during calculations. The ALU is a....
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The 555 timer IC is an integrated circuit (chip) used in a variety of timer, pulse generation and oscillator applications. The part is still in widespread use, thanks to its ease of use, low price and good stability. As of 2003 [update], it is estimated that....
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For the New Zealand band, see Dimmer (band). A common dual dimmer manufactured by Electronic Theatre Controls (ETC)....
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Amplitude modulation (AM) is a technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. AM works by varying the strength of the transmitted signal in relation to the information being sent. For example,....
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Villard cascade voltage multiplier. A voltage multiplier is an electrical circuit that converts AC electrical power from a lower voltage to a higher DC voltage, typically by means of a network of capacitors and diodes. Voltage multipliers can be....
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This article is about the term counter used in electronics and computing. For other uses, see Counter (disambiguation). In digital logic and computing, a counter is a device which stores (and sometimes displays) the number of times a particular....
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Early schematic of a Colpitts circuit, using a vacuum tube, redrawn from the patent publication. A Colpitts oscillator, invented in 1920 by American engineer Edwin H. Colpitts, is one of a number of designs for electron....
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A practical amplifier circuit An electronic amplifier is a device for increasing the power of a signal. It does this by taking energy from a power supply and controlling the output to match the input signal shape but with a larger amplitude....
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aquarium design, dpdt relay, 12v inverter: ONE: The relay you have selected is rated plenty sufficient for a 400 watt load. TWO: The 12v dc relay, transformer and diodes are using very little power so efficiency is of little concern. THREE: How are you....
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buzzer circuit, pic microcontroller, piezo buzzer is a computer chip. It is overkill for driving a piezo buzzer. It is certainly a very low power processor that is optimum for portable and small devices where battery power must be conserved....
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magnetic stripe reader, electric circuit theory, logic operation: Your wiring diagram does not connect the transistor in the circuit. The collector pin of the transistor connects to the tip pin of the Jack. The base pin of the transistor connect to the....
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2 versions. First is one based on your schematics, except that I`ve changed those smd capacitors for standard through hole ones. Second one is somewhat modified. I`ve excluded transformer and put in standard dc jack. Also, pic and display header are located....
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For many applications it is necessary to delay signals. Just think of applications in automation and control systems. Such a signal delay circuit can be set up with two monoflops....
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With an NE555 you are also able to build an astable multivibrator or blinker. Find out how, and what you need to be aware of....
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Telephone remote control for some of the ideas is the time, now can let you own a phone to do remote control, this is the procedure and circuit. Automatically executed complex functions. Facilitate the development of a telephone...
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full sine wave ups information, in English, with a detailed C language source code, English may be the weak to be careful of, a little..
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This wikibook is going to be an introductory text about electric circuits. It will cover some the basics of electric circuit theory, circuit analysis, and will touch on circuit design. This book will serve as a companion reference for a 1st year of an....
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For a fixed frequency transmitter one commonly used method is to use a resonant quartz crystal in a Crystal oscillator to fix the frequency. For transmitter where the frequency has to be able to be varied then several options can be used. It is often the....
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The 555 timer IC is a very versatile and useful component and can be used for many things, from giving clock pulses to switch debouncing and as an output transducer. The basic 555 IC is housed in an 8-pin carrier, and these come in DIL and SOIC formats. They....
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This plugin uses a quartz oscillator which uses a crystal (X1), amongst other components to give a 32, 768Hz (32, 768=215) output. This is input to a 4020 14-Stage Ripple Counter, which divides this signal down by 214 to a 2Hz signal. This 2Hz signal is then....
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Bipolar transistor amplifiers must be properly biased to operate correctly. In circuits made with individual devices (discrete circuits), biasing networks consisting of resistors are commonly employed. Much more elaborate biasing arrangements are used in....
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ITU-R 468 is a standard relating to noise measurement, widely used when measuring noise in audio systems. The standard defines a weighting filter curve, together with a quasi-peak rectifier having special characteristics as defined by specified tone-burst....
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A logarithmic resistor ladder is an electronic circuit composed of a series of resistors and switches, designed to create an attenuation from an input to an output signal, where the logarithm of the attenuation ratio is proportional to a digital code word....
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The Radio Hat was a portable radio built into a pith helmet that would bring in stations within a 20 mile (32km) radius. It was introduced in early 1949 for $7. 95 as the "Man-from-Mars Radio Hat. " [1] Thanks to a successful publicity campaign, the Radio....
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This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. Please help to improve this article by introducing more precise citations. Valves (also known as vacuum tubes) are very high input....
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In this version of the oscillator, Rb is a small incandescent lamp. Usually R1 = R2 = R and C1 = C2 = C. In normal operation, Rb self heats to the point where its resistance is Rf/2. A Wien bridge oscillator is a type of electronic oscillator that generates....
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Each tub sockets has 2 plastic nibs on the back. For each socket I drilled 2 holes into circuit material. Then I pressed the socket nibs into the drill holes. Finally I screwed the stripe of epoxy circuit material to the wood slat. The wiring diagram to....
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This Open Source thread is for the advancement of a ""Mosfet Heating Circuit"" one that is a modified replication of one....
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Energia is a rapid prototyping platform for the Texas Instruments MCU Launchpad. Energia is based on Wiring and Arduino and uses the Processing IDE....
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Energia is a rapid prototyping platform for the Texas Instruments MCU Launchpad. Energia is based on Wiring and Arduino and uses the Processing IDE....
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Energia is a rapid prototyping platform for the Texas Instruments MCU Launchpad. Energia is based on Wiring and Arduino and uses the Processing IDE....
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An infrared remote control car, the AT89S51 microcontroller as the core controller, DC motor with L289 drivers work to control the operation of car in this section with infrared remote control manual car driving, autopilot, tracing forward and other....
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This surround-sound decoder is based on the "Hafler" principle, first discovered by David Hafler sometime in the early 1970s. The original idea was to connect a pair of speakers as shown in Figure 1, for use as the rear speakers in the surround setup. This....
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This page features a circuit that has twenty open collector outputs that turn on one at a time in a continuous sequential manner. The circuit make use of the 74LSxx family of TTL integrated logic devices. The circuits are designed to drive light emitting....
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This page features a circuit that has twenty open collector outputs that turn on one at a time in a continuous sequential manner. The circuit make use of the 74LSxx family of TTL integrated logic devices. The circuits are designed to drive light emitting....
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Consider a simplified circuit of a typical relay as shown in the Fig. 1 usually the relay circuit is a three phase circuit and the contact circuit of relays is very much complicated. The Fig. 1 shows a single phase simplified circuit to explain the basic....
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The circuits on this page are for an Infrared - Proximity Detector using the Vishay Electronics - TSOP4830 "IR Receiver Modules for Remote Control Systems". In this circuit the TSOP4830 is used as a sensitive infrared detector that does not require shielding....
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For household or industrial application purpose, we are bound to use fixed ac voltage input. If we try to use this variable ac voltage as input to our regular usage machinery, such as lamps, fans, TV etc. then it would cause severe damage to our instruments.....
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The clock pulses from the555 astable circuit is sent into the 4017 decade counter. Each output becomes high in turn as the clock pulses are received. Appropriate outputsare combined with diodes to supply the amber and green LEDs...
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A DIY intervalometer for my Sony NEX 5N camera so that I could do time-lapse photography. This intervalometer should work with most Sony cameras: NEX, Alpha and other. To work intervalometer used infrared LED Serial LCD has 4 output: GND, VCC, SDA, SCL. SDA....
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The second is a Signal Distribution Board that relays voltage, ground, and other signals throughout the pick. We can use this board, and it is modeled on its page: Signal Distribution Board. The 7400 pick system has two stepper motors, both with two coils.....
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Here`s a signal injector for those of us like me who don`t have a bench full of nice test equipment. It can be used for tracing audio circuits for troubleshooting, or for working on audio circuits that require some kind of signal for testing. The injector is....
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The old common-base audio preamp, having a noise figure of 5dB is an obvious target to improve the noise figure. A common-emitter configuration, with shunt feedback gives 50 ohms input resistance (preferred by the mixer) and a 2dB noise figure. Two....
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The very small DC voltages at the output of the diode detector are difficult to amplify accurately. DC offsets introduced by any op-amp are the main culprit. Low frequency noise (1/f noise) is another. Chopping the DC with MOSfet switches is an excellent way....
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This oscillator requires no biasing components. Only an inductor and various matching or tuning capacitors are required to set the operating frequency. The active element is the 74HCU04 hex inverter. Only one of the six inverters is required for the....
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This page presents an alternate option to directly control your mount`s stepper motor board. There is not much difference in terms of stepper control functionality from the original modification as they both allow commands to be sent from the PC directly to....
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The modifications involve direct access to the stepper motor controls of your mount. Any "mis-control" or "mis-command" / "invalid parameter" or "garbage" data sent to the mount could accidentally activate the stepper motors and allow it to rotate "freely"....
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A transverter on a range of 70 MHz. With access to the transceiver KENWOOD TR-751A (144 - 146 MHz), which was already prepared to work with the transverter DB6NT 5. 6 and 10 GHz, ie, output power is reduced to 1 watt, and transfer to the central core of....
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To be able to implement analog to digital conversion using the ADC0804LCN 8-bit A/D converter. You will design a circuit and program the chip so that when an analog signal is given as input, the equivalent digital voltage is displayed on an LCD display.....
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The purpose of this lab is to implement a decimal counter which counts from 0 to 99. You will have to write a C program for the 80X51 micro-controller. You will then compile your C program using C51 compiler and burn it unto an 8051 stand alone chip. You....
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A light based sensor using an LDR (Light detecting resistor) and ofcourse an Op Amp. You can use this circuit to make line followers and other stuff. Here we go: Since we are using an op amp to compare we should first be clear about its functioning.....
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An 8051 program must interact with the outside world using input and output devices that communicate directly with a human being. One of the most common devices attached to an 8051 is an LCD display. Some of the most common LCDs connected to the 8051 are....
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With the advent of modern ICs, sophisticated circuits today no longer have to be complex and lengthy. The chips themselves carry most of the complex circuitry built-in and single handedly perform the desired function. Take for example the present battery....
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The Encoder and Decoder are different kind ofcombinationalcircuits which are used to convert binary information to decimal, octal and hexa decimal andvice-versa. A decoder iscombinationalcircuitwhich is used for to convert n it binary information to 2n....
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the diagram is a modify square wave inverter circuit diagram, and if you adjust the frequency by adjusting or turning the frequency resistor (VR 47Ok) the inverter output frequency can be strong enough to power a freezer compressor and some other electronics....
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This project really works with water. I don`t know how can I use this but you know that I like those stuff. I started my tesla coil too but I don`t think that this stuff will work. from a conventional transformer in that the voltage and current relationships....
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A valve radio receiver in its crudest form is a frequency determining tuned circuit, (consisting of an inductor and capacitor in parallel) followed by a series of valves coupled together. These valves act on the signal and provide high frequency....
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This is the 555 Sawtooth Oscillator circuit diagram with the detailed explanation of its working principles. The electronic circuit simulator helps you to design the 555 Sawtooth Oscillator circuit and to simulate it online for better understanding....
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This is the Sawtooth Wave Generator circuit diagram with the detailed explanation of its working principles. The electronic circuit simulator helps you to design the Sawtooth Wave Generator circuit and to simulate it online for better understanding....
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The circuit in the schematic below is an improved piece of generator electronics. This is an unregulated switcher. Its function is to make the instrument as loud as possible while keeping the CPU running as long as possible. It transfers electrical energy....
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This circuit, enclosed in a small plastic box, can be placed into a bag or handbag. A small magnet is placed close to the reed switch and connected to the hand or the clothes of the person carrying the bag by means of a tiny cord. If the bag is snatched....
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A simple timer that can be used to turn on/off a load after user specified time. The prototype was developed using xBoard MINI, a low cost easy to use ATmega8 development board. The program was burned to the MCU`s flash memory using eXtreme Burner - AVR....