Top Circuits Page 154
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This simple circuit can give regulated 4. 7 volts for charging a mobile phone. USB outlet can give 5 volts DC at 100mA current which is sufficient for the slow charging of mobile phones. Most of the Mobile Phone batteries are rated 3. 6 volts at 1000 to 1300....
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This portable solar lantern circuit uses 6 volt/5 watt solar panels are now widely available. With the help of such a photo-voltaic panel we can construct an economical, simple but efficient and truly portable solar lantern unit. Next important component....
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A very simple dimmer circuit with only the essentials. (In this circuit, the values are given for a BT138 at 220V AC, for 115V AC you may have to experiment with the values. ) R1 can vary from one triac to another, put a 220K © trimmer in its place and....
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A circuit that allows you to control a relay in response to sound from a non-amplified sound source (computer, CD player, or my Digital Sound Recorder board). This circuit accepts audio input from any non-amplified sound source and when the volume reaches a....
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Magnetic reconnection refers to the local breaking of magnetic field lines and subsequent change in the global topology of the magnetic field in the presence of plasmas or conducting fluids. During this process, magnetic field lines of opposite polarity are....
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As mentioned before, a reason to modulate a message signal is to match the communication`s channel frequency. The reason for this is that information to be send over the channel is often at a rather low frequency. For example, the sound of music range in....
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The Chameleon II Power Supply Circuits take the raw input supply and provide the steady voltage supplies required by the Chamelon interfaces. The supplies are +5V, +12V and -12V...
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According to the TEA5711 datasheet, there are necessary functions such from AM and FM front end to AM detector and FM stereo output stages are integrated in this TEA5711 AM/FM stereo radio circuit. The circuit diagram above shows TEA5711T with stereo....
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96 Cad De ville which has been separated at the A-Pillars and just behind the windshield. I have the front end with all mechanicals in tact, I have....
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I just bought a 1997 dodge dakota extend cab sport how can i find a tail light wire diagram or brake light diagram ?....
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Hello i have a 2002 gmc sierra 4wd 1500 series 4.3l. i just replaced the transmission on it along with the neutral safety switch. The problem i am....
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The schematic shows the design of a circuit that senses the resistance of the skin and converts it into a useful switching signal....
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As the only electronics engineer in my family and circle of friends, it is sometimes not possible to evade an appeal for help. This time the request came from a friendly elderly lady in a retirement home. In her room the light switch by the door and the pull....
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Interesting articles about reading/writing RFID proximity cards that we use foraccess to controlled areas. This all came about after a discussion with a colleague about how easy it would be to clone a card. After a bit of research we managed to find and talk....
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Before trying to understand a full bridge circuit, you may care to read up on PWM controllers, which page also describes how a half-bridge circuit works. Most full bridge motor controllers also use pwm! Designing a full-bridge PWM circuit that is reliable....
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The circuit is so simple that there is little to say about it, but it gives very good results. Tr1 is operated in grounded base mode with input to its emitter to give low impedance input. The values shown give correct operation from 9v. If operating from....
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A commercial motor controller is more than simply a circuit to alter the speed of the motor and we have a `guided tour` of controller features which explains simply most of the features incorporated into modern controllers and why they are needed. To control....
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This is an unusual circuit for an ultra-low distortion power amp. According to my original notes the circuit is dated January 1977 so the circuit is not exactly modern but it is still sufficiently different to be interesting. The circuit was designed and....
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The capacitor C charges via R1 and R2 and when the voltage on the capacitor reaches 2/3 of the supply, pin 6 detects this and pin 7 connects to 0v. The capacitor discharges through R2 until its voltage is 1/3 of the supply and pin 2 detects this and turns....
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The 555 will activate a relay. When pins 2 and 6 are connected as an input, the chip requires only about 1uA to activate the output. This is equivalent to a gain of about 200, 000, 000 (200 million) and represents about 4 stages of amplification via....
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This circuit uses the 555 timer in an Astable operating mode which generates a continuous output via Pin 3 in the form of a square wave. This turns the LED (D1) on and off. The speed at which the LED (D1) is turned on and off is set by the values of R1 and R2...
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Built servo tester cicuit as shown - only action is for the servo to twitch when power switched on, cannot see any real reason why wont work - ideas anyone I haven`t built this circuit yet so I can`t comment on the circuits efficacy. I do have some....
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This circuit drives a motor clockwise / anticlockwise via a pot and reduces the speed to zero when the pot is in mid-position. The current is limited to 200mA and the voltage across the motor is less than 6v, but the circuit shows the principle of Pulse....
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This circuit uses the 555 timer in an Astable operating mode and generates a continuous output via Pin 3 in the form of a square wave. This is then passed through the 22 ½F electrolytic capacitor to create a smooth oscillation which then creates the....
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An Astable Circuit has no stable state - hence the name "astable". The output continually switches state between high and low without without any intervention from the user, called a `square` wave. This type of circuit could be used to give a mechanism....
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This circuit uses a 555 timer which is setup to both runn in an Astable operating mode. This generates a continuous output via Pin 3 in the form of a square wave. When the timer`s output changes to a high state this triggers the a cycle on the 4017 4017....
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A robber will not stay anywhere with an ear-piercing sound as he cannot hear if someone is approaching. It`s the best deterrent you can get. The "F" contact on the piezo is "feedback" and is not needed in this circuit...
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This circuit produces a very high voltage and care must be used to prevent getting a nasty shock. The transformer can produce over 1, 000v and the 8-stage multiplier can produce up to 20, 000v..
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This circuit produces a tone according to the button being pressed. Only 1 button can be pressed at a time, that`s why it is called a monophonic organ. You can change the 1k resistors to produce a more-accurate scale...
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These two circuits make a LED fade on and off. The first circuit charges a 100u and the transistor amplifies the current entering the 100u and delivers 100 times this value to the LED via the collector-emitter pins. The circuit needs 9v for operation since....
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Sometimes, you may keep a part of application code in the Flash/EPROM version of the 8031 and remaining part in an EPROM (in an expanded system). Time has come to introduce another useful tool, 8051 Programmer. This Programmer supports the devices in the....
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8051 provides a transmit channel and a receive channel of serial communication. The transmit data pin (TXD) is specified at P3. 1, and the receive data pin (RXD) is at P3. 0. The serial signals provided on these pins are TTL signal levels and must be boosted....
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Microchip has addressed this need with a full line of serial EEPROMs, in a variety of memory configurations, using the industry-standard 2- or 3-wire communication protocols. SDA1 EQU P1. 1 ;SDA=PIN5 SCL1 EQU P1. 0 ;SCL=PIN6 WTCMD EQU 10100000B ;WRITE DATA....
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This Project is used to indicate the temperature and it is also used as controller. The system will get the temperature from the DS1820 and it will display the temperature over the LCD display. There are 2 preset levels, one is low preset and the other is....
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Hi to all So I have come to a point where I was able to think about a certain circuit design and write the Assembly code program for my 3 level mini ....
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Binu submitted a new resource: Circuit and Program to Interface MT8870 with AT89S51 (version 1.0) - Decoding the DTMF signals from the telephone line ....
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You have mentioned 89S51/52.But in the picture I see 89C51. Which one do I use for the given .hex file(without the need to change the .hex file)?2....
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Change the smart cards into manual push buttons to set the energy consumption so that the consumer will need not worry on where to buy smart cards. is this a possibility we also don`t have enough supply of smart cards here in out location. we are planning to....
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We are doing sms based home appliance control system.We used ATtiny2313 micro controller.We are having problem programming the micro controller. Is there ....
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The circuit diagram of TV antenna The diagram is from the tech information of chinaicmart. IF for more detailed infomation or more circuit ....
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Analog to Digital Converter ADC interfacing with microcontrollers AVR 8051 PIC, Digital-Ramp ADC, Successive approximation ADC, Flash ADC and basic working of an anlalog to digital converter....
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DC motor interfacing with microcontroller with the help of L293D H-bridge and trasistor based H-bridge. DC motor speed control using PWM. Interfacing DC motor with 8051, AVR, PIC microcontroller....
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Learn implementing I2C on 8051 PIC and AVR microcontrollers. Here you will find codes and examples for using I2C library....
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learn to interface 4x4 matrix keypad with AVR and 8051 microcontroller and program AVR microcontroller and 8051 microcontroller in C and assembly for keypad matrix....
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This program is a simple Traffic Light Controller. Between start time and end time the system controls a traffic light with pedestrian self-service. Outside of this time range the yellow caution lamp is blinking. |
" "+ command -+ syntax -+ function -+
" "|....
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Currently working on an insect robot project. my first robotics project! I`m looking into 2 methods of detecting obstacles i. e. IR and Ultrasound. I cannot seem to choose at this point in time! Can someone give me some guidelines as to which is more....
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One crude method for distance measuring is by using an ultrasonic transducer. the principle is that u send a burst of ultrasonic wave in the direction of the object and it is reflected back to the ultrasonic receiver. by measuring the time delay from....
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Make this temperature controlled fan and since i am using 15V AC power supply instead of 230V AC. what i want to know is if i would have to change the triac and the resister shown in the diagram below and also if i can use MOC3041 Triac driver optoisolator....
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I have completed this above mentioned project. People have had SMS contl on Siemens/Ericsson/and other phones but they have a modem on them, and comapratively simpler coding is needed. Older nokia fones use FBUS protocol which is their (nokia) own difficulkt....
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if your AC fan have 3 button (like i have), button 1 (for low speed), button 2 (half speed), and button 3 (high speed), you can use Relay for switch the speed changing that button. But if your AC fan have 3 button (like i have), button 1 (for low speed),....
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Can i use the following circuit or is there any special IR decoder IC and schematics available If the decoder supports any remote is good and well, is it possible But i want to control variable resistor via IR without relays(Means not any different fixed....
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This is not very critical and any other device (such as tape player with message recorded on an endess tape) which does not overload the circuit or the telephone line, may be used. The incoming line is protected by metal-oxide varistor (MOV) RDN 130/14....
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Constructing a robot or should i say a vehicle dat uses 2 motors. I managed to get sum referance regarding d schematics for the circuit design but the current schematics uses a smaller motor. which draws less power and uses a much less power supply. the....
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Designing the circuit for the DC motor and bluetooth system. The bluetooth remote control is used to open and close the curtain. Below is the block diagram for your reference. 2. You can make use of your mobile phone, write a J2ME application for....
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Most of the LCD issues are due to Delay routines only. First try to interface LCD properly then try for your digital clock. Step by step approach is important. You may refer to LCD tutorial which is in tutorial section. code is ok i check it on Proteus it is....
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I m planning to construct a frequency synthesizer circuit and i found this circuit diagram..but i m unable to figure out a component..can any1 explain 2me what is the part with the VDD from pin 9,Vss from pin 8 and pin 12 connected to the phase comparator 2..
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Build a digital multimeter that can measure dc/ac voltages up to 100V and dc/ac currents up to 1A. The circuit will be powered by 9v battery. I have decided to use the voltmeter from and modify it according to my needs. The problem is that after implementing....
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Interface the LCD with 8051 microcontroller at89s52. But whenever I power up the microcontroller, LCD is lit but only black boxes are showing. I have tried many different codes and many things, but display is same. onle black boxes. But i have simulated this....
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Using Nokia 2300 for my project and the original earphones that came with it. They work properly when listening to radio, or talking to someone over the phone. However, the MT8870 IC does not give output when I connect it to my AT89S52 microcontroller. I....
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actually i wanted to know about the female connector used in PC for connecting the speaker. i hope u got it. i wanted to know the pin connections of the jacks. i shall show u the circuit for the audio coupling of the PC to telephone line. also please suggest....
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The problem is when i connect the 8051 to the encoder the data send is not received at the receiver but as soon as the 8051 connections are removed the transmisison works perfectly. thus manually the RF communication works perfectly i. e the 8 bit data which....
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For those are not into electronics, you must know that an oscilloscope has basically only one timebase to move the spot horizontally from left to right with the same intensity. The vertical deviation is function to the input voltage. You understand....
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Serial communication using UART or USART of a microcontroller 8051 AVR PIC, software implementation of half-duples UART and MAX232 interfacing with microcontrollers 8051 AVR PIC....
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stepper motor interfacing with microcontroller. Full step and half step stepper control. working and basics of stepper motor. 6 lead unipolar stepper motor tutorial, Bipolar Stepper Motor tutorial....
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Microcontrollers & Microprocessors - The 8051 projects Page! Find out all our information on 8051 projects here. Everything you wanted to know about 8051 projects but were afraid to ask!....
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VisISP-52 is a Windows application that will run on all modern versions of Windows (Win95, Win98, Win2000, WinME, and WinXP) and which will allow supported microcontrollers to be programmed "in-system". It was developed specifically to program the Atmel....
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This is a square wave oscillator (digital, like 8-bit music). It`s based around the LM386 amplifier I. C. , which is what the mini guitar amplifier was based on. It has a simple power switch connected to the battery, a potentiometer for adjusting the tone,....
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ART TPS2 is a starved tube mic preamp. One 12AX7 tube operating at about 50v plate voltage to add color to the sound. As I intended to build a all solid state preamp, the 12AX7 and its peripheral component were removed. The right channel input stage is....
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This is the schematic for an FM transmitter with 3 to 3. 5 W output power that can be used between 90 and 110 MHz. Although the stability isn`t so bad, a PLL can be used on this circuit. This is a circuit that I`ve build a few years ago for a friend, who....
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The communications between commercial aircraft and the ground can be interesting, amusing and sometimes even disturbing. However radios that receive the approximately 220MHz to 400MHz band commonly used for aircraft (both military and commercial) are not....
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This circuit is a stable frequency counter accurate to 5 significant digits. The range is 0 - 30MHz with an input sensitivity of greater then 100mV. The probe connects to the PC serial port. So by using the crystal oscillator already present on your PC....
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This circuit creates a stunning display of the "magic" of magnetism by suspending a small metal object in mid air. Using an electromagnet, photo sensor and closed loop control, small and light metal objects can be floated just underneath the magnet, enclosed....