Top Circuits Page 151
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This is the electrical signals that run along the neurons in your brain and body in general, constantly relaying information back and forth throughout the whole complex machine. Without it we would be like plants, with one part of our bodies completely....
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There are several applications in which a buttonless keyboard might be useful. In exteriors, they can capitalize on the fact that without buttons the keyboard can be fully closed and therefore it is weather resistant. Moreover, they seem to be easily made in....
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This design resulted from the need for a partial replacement of the well-known 8038 chip, which is no longer in production and there fore hardly obtainable. An existing design for driving an LVDT sensor (Linear Variable Differential Transformer), where the....
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In those circuits a set of switches (conforming to code) are pressed one by one within the specified time to open the lock. In some other circuits, custom-built ICs are used and positive and negative logic pulses are keyed in sequence as per the code by two....
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Major role in the PLL phase detector is held by the duty comparing the input phase of the VCO signal with a reference signal and the output is a different phase. The existence of different phases will provide a further voltage difference, the difference....
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The LEDs are active-low (0) while the switches initial state is high (1). In other word, the PC software needs to give low (0) to on the LEDs and if a low (0) is read from the input pins, corresponding switch is pressed. I’m using the prototyping area....
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Decoder Tags: PT2262, PT2272, Remote Control, RF-RX-315, RF-TX-315 Remote Control 315MHz by using RF remote control Encoder and Decoder Published by: cl.chin on September 3, 2012. 48 Share Tweet 3 Share Share Introduction RF-TX-315 & RF-RX-315 RF Modules....
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In order to measure the temperature without using the thermometer, thermocouples are the option to do so. However, the thermocouples need a reference temperature(normally take 0°C ) as to detect the difference of the temperature in between the materials of....
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This is a continuation of the article An AVR microcontroller based Ethernet device. The hardware is still the same (ENC28J60 + atmega88). The software is now updated to provide also a web-server. That is: instead of using a command line application and send....
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The Network Time Protocol (NTP) has revolutionized the world. Suddenly one could have anywhere in the world accurate time and date. NTP is a simple UDP based protocol and can be implemented in a Microcontroller. So far we have only implemented UDP and TCP....
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USB HID is a specification that includes things like mouse and keyboard. has a GPL based driver to implement USB in an avr microcontroller without specialized hardware. There is also the AVR309, software USB application note from Atmel. I don`t know who....
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The Mini 3 digit display aka "DVM-module" (digital voltmeter module) can easily be tuned and modified because you have control over the firmware. The key advantages of this module are: The internal reference voltage in the atmega8 microcontroller is 2. 56V.....
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The Network Time Protocol (NTP) has revolutionized the world. Suddenly one could have anywhere in the world accurate time and date. NTP is a simple UDP based protocol and can be implemented in a microcontroller. The tuxgraphics NTP clock has been very....
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The oscillator model I talked about in the introduction to oscillators was as simple as it gets - capacitor + inductor. So I wanted to try to make my own oscillator. In a search for how to make an oscillator I got a website with a few different kinds. They....
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These two tank circuits seem to expand that operating spectrum. Maybe The information sheet that came with the bug states that When both circuit stages are oscillating at the same frequency, the power output will be at a maximum. This must mean that if the....
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This is a low cost 150 watt amplifier circuit with diagram and schematic design using two darlington power transistors tip 142 and tip 147. this amplifier circuit can This is a low cost 150 Watt amplifier circuit with diagram and schematic design using two....
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Using a single 7812 ic voltage regulator and multiple outboard pass transistors, this power supply can deliver output load currents of up to 30 amps. this circuit is Using a single 7812 IC voltage regulator and multiple outboard pass transistors, this power....
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The Micon-GHS clock is a very accurate handy clock for mobile observation with some intelligent facilities. `Note that "Micon" is a short form for "Microcomputer" in Japanese. `The clock was operated by referring the GPS (Global Positioning System) signal,....
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Analog to Digital converter modules are used in Micro controller based projects where the analog signals are required to be converted into digital signal for further processing in Micro controller. The integrated chip used for this purpose is 0809 ADC. This....
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Visit eBid United Kingdom, the Online Marketplace without the Fees - buy and sell today....
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The whole system was built in a package that was about 70mm x 96mm x 30mm which contained the TNC, transmitter, interface circuitry and a lithium battery sufficient for about 20hours of continuos operation. All in weight (including battery and antenna) was....
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For the long-distance listener (dx-er) it is a treat to listen on a band 8MHz wide which normally is completely empty, but which is capable of providing periods of clear reception during the `Sporadic E` season from several distant countries. Usually only....
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The PIC32?s Analog to Digital Converter (ADC) is surprisingly difficult to set up if you re using it for the first time. Like so many of the PIC peripherals, the number of configuration options seem endless. This tutorial will help you....
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The human eye is amazingly adept at tracking moving objects. The process is so natural to humans that it happens without any conscious effort. While this remarkable ability depends in part on the human brain`s immense processing power, the fast response of....
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Here is the circuit diagram of a simple and straight forward 12 V battery charger circuit with diagram. This circuit can be used to charge all type of 12V rechargeable batteries including car batteries and motorcycle batteries...
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With these, you can make your very own security system that gives intruders a sporting chance! It`s the laser-version of saying But before I kill you, Mister Bond This laser tripwire system will trigger an audio alarm (made from a 110dB piezo personal....
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Here is the schematic for the circuit, including the connection to the piezo hit sensor. For testing, you can connect an LED between pins 3 and 4 of the 74HC14. Giving the plexiglass plate a good smack should either light or unlight the LED (depending on....
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The WWVB signal is broadcast as a 60 kHz carrier that is AM modulated with a time code frame that is updated once per minute. The data rate is one bit per second. Along with time code information, the data frame also contains synchronization bits, calendar....
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For those who never heard about supercapacitor, you can check for more info about supercapacitor here. Supercapacitor is basically a capacitor with very high capacity, and the capacity rating is normally around few Farads. With the super capacity, it....
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It can detect what`s being typed on it. It can be used to send text to and/or receive text from a computer via USB. It was designed as a platform for playing interactive fiction games, in particular to play custom software being developed for it by Jim....
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Once you have compiled your C or C+ program into an AVR binary using AVR-GCC, you will need to "burn" it to the chip itself. This can be done with one of three applications: AVRDUDE, UISP, or AVR Studio. In order to actually get one of those applications....
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This is the first electronic circuit I designed from scratch, my first time programming a MCU, the first time I wrote an application in assembly language and my second homemade PCB. Usually people starts building very simple things and they increase the....
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This project uses a widely available IRF510 MOSFET. This N-Channel enhancement mode silicon gate power field effect transistor is an advanced power MOSFET designed, tested, and guaranteed to withstand a specified level of energy in the breakdown avalanche....
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easy to build home made 50 Mhz (6-metres band) vertical half wave antenna! Omnidirectional, high gain, low SWR!....
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The MAR6 (MSA-0686, 0685, 0885) is a high performance silicon bipolar Monolithic Microwave Integrated Circuit (MMIC) housed in a low cost, surface mount plastic package. This MMIC is designed for use as a general purpose 50 W gain block. Applications include....
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A hexapod walker robot that uses three servos. It uses a Parallax Basic Stamp I for its brains, and let me tell you, its all this controller can do just to make the bug walk! Walking is MUCH more complex than just rolling! I will have more details and pics....
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I decided to build an infra-red object detection system using High Output IR LEDs. For the controller of the robot I used the Parallax BASIC Stamp I. The latest greatest version of the software, at least as of 10/9/98, gives IRBOT three modes of operation.....
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A model boat that can sail autonomously along a course planned in advance. This explains the meaning of "Roboat" that is the short form for "robot boat". The core is the controller M68HC908GP20 (the quad flat plastic pack version) that stores the coordinates....
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This is a simple circuit that can detect sounds by using a common condenser microphone. Sensitivity is variable. The circuit`s output becomes High each time a sound is detected, otherwise it is in low level. You can use it in simple robots for sound....
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This circuit is one of the simplest voltage to current converters to drive low loads. In this example a small 0, 25 Watts speaker, with 8 © resistance, is driven. It is suitable for microcontroller designs or any other circuit that uses PWM (TTL logic). You....
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With the following circuit you can easily program the AVR microcontrollers AT90S1200, AT90S2313 (or ATtiny2313), AT90S8515 and AT90S4414, using the freeware programmer PonyProg by Claudio Lanconelli. You can download the program for free from the author`s....
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This circuit is designed to digitally increase/decrease the volume of an analog audio signal. It uses a single AVR microcontroller to produce the controlling pulse width modulated (PWM) signal. However, the circuit`s innovation is the use of the....
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This is by far the simplest VUmeter you can build. It is based on a single chip. A volume unit (VU) meter or standard volume indicator is a device for displaying the level of any voltage signal source (which is usually a sound signal). Connect the module to....
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The purpose of this project is to construct a computer that uses the combined computational power of many microcontrollers (MCUs). All the MCUs cooperate to solve one problem. The computer is defined as parallel processing machine and the algorithms that....
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Schematics for an 80W electronic ballast to drive 2 48"" lamps....
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With the remote control at your fingertips, you are the only one to decide when and if the parachute should deploy. Ideally, in a very large open field, you can wait until after apogee to deploy the parachute. Depending on wind conditions, you can decide....
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An 5 pole elliptic low pass filter (impedance: 50Ohm, -6dB cut off frequency 33MHz) connects the antenna signal to the diode ring mixer, a traditional SBL-1, which offers good performance even below 500kHz. A high pass / low pass diplexing filter leads the....
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I was lucky to use an HP33290A wave generator for my radio building projects, a fantastic instrument for generating all kind of signals up to 15MHz. Since I could not always rely on it and buying one would by far exceed my yearly hobby budget, I decided to....
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Circuit detail is shown in figure 3. The main elements of the system are a speech amplifier, the audio phase shift network with balanced driver circuit (N1A, N2A), two balanced modulator stages (N1B & N2B), an RF carrier phase shift circuit (N3) and an....
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A low distortion audio frequency sine wave can be easily generated by passing the output of a simple square wave oscillator through a sharp cut off low pass filter to attenuate the odd harmonic components. The output level of the sine wave is precisely....
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A deviation monitor can be made by connecting some form of frequency modulation (FM) detector to an AC voltmeter and calibrating the meter in units of frequency deviation. One method of detecting or demodulating the FM signal is to use a phase locked loop....
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Any mode (e. g. CW, AM, SSB, FSK) which is initiated in the HF transmitter or transceiver can be regenerated at LF (100 to 200 kHz) using this simple converter. The output at LF can be used to drive an LF Power Amplifier. The February, 2000 issue of Amateur....
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A simple meter to check the balance of currents running in the two legs of a transmission line. It can be used to check the balance of currents between the inner conductor and the outer coaxial conductor in a coax cable as well as between the legs of an open....
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The Q meter has been an essential piece of equipment for laboratories engaged in the testing of radio frequency circuits. In modem laboratories, the Q meter has been largely replaced by more exotic (and more expensive) impedance measuring devices and today,....
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This instrument measures inductances from 0. 1 microhenry to 3 millihenries divided into four ranges set by a switch. It operates from 12 volts, and is powered by eight AA type cells attached to the unit. I initially referred to Drew Diamond`s unit in....
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A simple circuit which is switchable between a sharp cut-off above 2. 5 kHz and a narrow bandpass around 800 Hz. In the low pass (LP) state it can be used on speech as the filter section of a direct conversion receiver. For CW operation, the cut-off....
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Before attempting to build the control circuit, it is recommended that the function of each part the circuit is understood. The schematic below shows the basic functions only. CRS Controller board: The key synchronization signal or Scan Line Clock (SLC) for....
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Autonomous vehicles are already in use in many manufacturing facilities, and they are also sold as toys. Perhaps one day, the world`s highways will be filled with cars requiring no user intervention. While we are not there yet, and may never get there, an....
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Building your own signal generator is a rite of passage for any analog DIYer, but it`s one I took a long time to get around to. I already have a bench signal generator, but I decided it would be useful to have a small battery powered device that I could....
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The NESCAF audio filter is a small and low cost circuit that works great. It is a good addition to any amateur radio setup. It is especially useful with radio receivers or transceivers that lack an optional CW filter. I have made a product review of the....
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SUMMARY This circuit is one of the most basic and popular sensor modules. In electronics, this sensor is analogous to human s visionary senses which can be used....
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INTRODUCTION It is very important to keep a track of the working of almost all the automated and semi-automated devices, be it a washing machine, an autonomous....
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The movement of the servo depends on the output value of the photoresistors. The impedance of the sensors varies with the light that incident on them. The position of the servo always changes toward the sensor with less light. There are four light sensors.....
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classic 555 timer chip schematic circuit t shirt by eevblog picture on VisualizeUs - Bookmark pictures and videos that inspire you. Social bookmarking of pictures and videos. Find your pictures and videos....
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L1 and L2 were made by wrapping three tight side by side loops around a sharpie marker, I also made L2 by wrapping about 8 inches of 35AWG magnet wire around a ferrite core, careful to make the windings side by side and glued it in place with a hot glue gun,....
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The circuit shown here should have a lot of applications. Basically, the distribution amplifier takes the composite video signal from a video player (VCR) or a video generator (analogue output) and buffers it in such a way that it can be simultaneously....
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The problem with this monitor is that the power supply for the vacuum tube back lighting dies. The first step is to totally disassemble the monitor into little pieces, then carefully remove the gold colored trays that hold the vacuum tubes. Then carefully....
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