Top Circuits Page 161
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Making a hi-end, accurate digital LED clock today is as easy as cooking noodles. The article explains how a digital clock can be made using over the counter electronic chips like the National s MM5402 clock IC and a handful of other components. This single....
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The article presents a circuit that can be used for indicating the riding speed of a bicycle. The circuit of a bicycle speedometer explained here uses ordinary components like transistors and LEDs and yet succeeds in displaying a distinct 10 step, accurately....
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Make yourself this simple dc to dc mobile battery charger and charge your mobile phone battery whenever and wherever you want, simply by connecting it to a 12 volt source from your car or motorbike battery....
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Want to make a set of attention-getting LED running lights? This article provides a circuit diagram and discussion of the CMOS logic and IC layout for a simple sequential LED flasher or light chaser that one can build, including the parts lists. The heart of....
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Building a RFID access control circuit at home and seeing it actually work can be truly an amazing experience. Although the circuit is not a hi-tech one, but comparing its low cost with the fairly good results obtained simply proves its high degree of....
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This article is the compilation of small transistor circuits and configurations for beginners like current amplifier and limiter, oscillator, latch etc. Using just a couple of NPN transistors a simple current amplifier circuit can be built. Two transistors....
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The project†DIY: build sound activated switch†presented here is pretty easy to construct and can prove to be very useful in protecting a particular area from a possible theft or intrusion. Learn how to build a simple sound activated alarm here on....
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The light fader circuits presented here have a common idea of producing a “cool†switch ON and switch OFF effect on the connected lamps, i.e. every time these lights are switched; the outcome is gradual and not sudden, producing an interesting slow glow....
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The 10k resistors in question are R15, 17, 18, and 19 (R16 is somewhere else). Their purpose is to separate the input channels, because otherwise turning the volume control for one channel down to zero would also connect the output signal to ground, cutting....
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Connecting and programming the TA8050 DC motor controller with the Arduino microcontroller....
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In this circuit we demonstrate how to use SCRs to control low-voltage pulsating DC to operate homemade LED light panels. While in this circuit I use the Arduino, the concepts should work with any number of micro-controllers using either hardware interrupts....
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How to connect and program the Arduino/Atmega168 microcontroller to operate a unipolar stepper motor....
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How to connect and program the Arduino/Atmega168 microcontroller to LCD display and DS1307 RTC....
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Build various power conversion circuits with Arduino microcontroller....
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Learning how to use power MOSFETs by building an H-bridge motor control....
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Construction and programming PICAXE solar panel battery charge controller....
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Bruco Integrated Circuits B.V. >> Case: Automotive alternator voltage regulator - Bruco....
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Batcopter was built for Stanford`s first of three Mechatronics courses, ME218A. It is a mechanical version of the classic flash game Helicopter. The game has additional interactions for added complexity including enemies & different modes of difficulty. It....
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You could really use any phone for this project, so don`t worry if you can`t get or don`t want the same model as mine. If you do get an antique bakelite phone, here are some basic steps for restoration. Clean your phone with a rag dampened in one of those....
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The idea for the project started nearly two years ago, while I was researching the purchase of a new lighting board for a small theatre where I was working at the time. While our old board was nearly twenty years old, and desperately in need of a....
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In this Project we have designed an embedded system which is used for tracking and positioning of any vehicle by using Global Positioning System (GPS) and Global system for mobile communication (GSM). When the request by user is sent to the number at the....
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This Spy Pen FM Transmitter Circuit Can Be Built In A Ballpoint Pen. Crystal Controlled....
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About telephone tapping. TSCM bug sweeps telephone, computer data lines, and bug sweep offices to free them of electronic eavesdropping and wiretaps....
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In this electronics project I am modifiying and old radio into an iPhone dock. Video and pictures included to show you the whole process....
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The following schematic has been taken from buildcircuit. com. The following circuit can work as a music generator, Infrared transmitter and LED blinker depending upon the values of R1, R2 and C1. Making a minor modification in the previous circuit makes it....
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Automatic dark detector senses darkness. As the light level decreases and LDR meets the maximum threshold resistance, the circuit automatically switches on the LED D1. A light detector senses light. As the light level increases and LDR meets the lowest....
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This versatile 741 operational amplifier module can be used for making a dark detector using an LDR, a photo transistor and a photo diode. The amplifier has been configured in inverting mode. It compares the change in voltage at pin 2 with the reference....
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This wireless transmitter and receiver pair operate at 315Mhz. They can easily fit into a breadboard and work well with microcontrollers to create a very simple wireless data link. Since these are only transmitters, they will only work communicating data....
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LDR( Light dependent resistor ) Engineering is a technique of making several electronics circuits following thelogic of a simple light and dark sensor using transistors, 555 IC and 741 IC. Out of several optical sensors, light dependent resistor can beused....
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Here`s a simple light activated police siren using light dependent resistor and NE555 timer. Before you make this project, I would recommend you to make the following projects. The 555 timer with R1=68K(say timer1) is configured in slow astable mode and the....
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Here`s a simple experiment with LDR and CD4093. This is just a modification of a previous project dark sensor using 2 transistors . In this project, the CD4093 is configured in such a way that whenever you block light falling on LDR, the circuit starts....
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This tutorial is about mp3 mode of WTV020SD-16P module. With this simple circuit, you can play AD4 format music files. At the end of the article, you can see a video output of this simple and easy project. I used a 5V and a 3. 3V regulators for this project.....
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Remote tester circuit also resembles the logic of a dark sensor (using BC557) . LDR has been replaced with IR sensor TSOP 1738. The circuit works as a remote tester. Pressing a remote control switch near the IR sensor, switches on the LED D2. I am Sagar....
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When you press sensor switch SW2, the LED D3 and the alarm switches ON for a while. The timing of the circuit is dependent upon R3 and C1. You can get all the details of the RC circuit from the links given above...
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This tutorial is for making simplest FM transmitter using one transistor. You can make this project with less components and it is an easy and simple project for beginners. Before you proceed, please see the schematic given below. In the schematic, you will....
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Circuit given below is configured on astable mode of operation. In place of a fixed resistance, LDR has been kept for getting variable resistance for the 555 timer to work in astable mode. Now, as the resistance increases or decreases in accordance to the....
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The following circuit works as a toggle switch. The circuit has two stable states, ON and OFF. Once it is ON, it remains ON till you press the switch again. The project has been derived from buildcircuit. com. In all MINIBREAD projects, we have used the....
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I have developed an inexpensive control system (less than $70) that can be used to both get more cutting power out of a DC discharge laser and significantly improve cutting accuracy for home built laser systems. The control system implements a control....
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The recent Epilog Laser Challenge at Instructables. com got me thinking about building a low cost CNC laser. The engrave r they had as the prize had a list price of about $8, 000. The income tax on that would be quite a lot. I thought a larger more powerful....
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Instructions for wiring and installing a Doorbell in your home....
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Smoke and fire alarms are an important part of your home`s safety plan and careful attention must be made to proper fire alarm installation and wiring. The information below will provide some basic guidelines for installing a fire alarm system in your new....
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radio transmitters for evesdropping on private conversations and sending video pictures, battery operated....
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A continuity tester is handy for checking that there is an electrical conducting path between two points. The following circuit has the advantage that it is very sensitive and it gives both a visual and audible indication of continuity. An audible tester is....
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These relatively simple circuits can be used to transmit information across a small distance. The "information" I normally use is music from a radio, iPod or CD player - you could also try a microphone and amplifier. People transmit information all the time....
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The transmission distance can be increased greatly by replacing the transmitter`s red LED with a cheap red laser diode purchased from a $2 Dollar Shop . The circuit design makes a compromise between laser brightness and sound quality and loudness. This is....
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Detailing the design and build of a 60khz time code receiver and clock. From PIC programmer to LED clock display....
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The hydraulic system includes pump No. 8 (Drawing 10) installed on the gearbox, dispenser (1), oil tank (4), hydraulic jack (5) and oil conduits. From the tank oil moves along conduit (9), sucked in the pump (8) and gets into dispenser (1) via conduit (7).....
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This is a simple interface box to allow connecting a radio to a PC with some improvements with respect to similar projects available almost everywhere. Interfaces like this one are used to manage via PC the transmission and reception of digital signals....
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This project has been developed together with some other OMs (in particular Marco IW1DGG) in our local radio club. When we started looking at a simple transmitter providing sufficient power to exice the local ATV repeater we did not find anything simple to....
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Is slowing Once a primary driver for growth, the adoption of high definition and digital cable service is starting to slow as the numbers of applications on PCs (Skype, magicJack) and smartphones. Even the increased adoption rates of MSO voice. e…§e® Is....