contactless digital tachometer using 8051 abstract

Contactless digital tachometer using 8051.
A three digit contact less digital tachometer using 8051 microcontroller which can be used for measuring the revolutions/second of a rotating wheel, disc, shaft or anything like that is introduced in this project. The tachometer can measure up to a maximum of 255 rev/sec at an accuracy of 1 rev/sec. What you just need to do is to align the sensor close to the reflective strip (aluminium foil, white paper or some thing like that) glued on the rotatin ....etc

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In electronic ac voltme ters input signal is firstly rectified and then sup plied to the dc amplifier. In some circuits, the block diagram includes the attenuator, the rectifier and the multi-stage DC amplifier. and finally the output is shown in the PMMC meter. Sometimes, the block diagram will be attenuator->multistage amplifier, rectifier and PMMC meter.

AC voltmeters are divided into:
Average Reading AC Voltmeters.
They are average responding type and indicates the average value of the voltage on the dial. This method is ef ....etc

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Abstract.
Using piezoelectric elements to harvest energy from ambient vibrations has been of great interest over the past few years. Due to the relatively low power output of piezoelectric materials, energy storage devices are used to accumulate harvested energy for intermittent use. Piezoelectric energy harvesting circuits have two schemes: one-stage and two-stage energy harvesting. A one-stage energy harvesting scheme includes a conventional diode bridge rectifier and an energy storage device. In recent years, two-stage energy harvesting ci ....etc

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plz send me the details on topic prepaid energy meter using 8051 ....etc

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hi..we want the project abstract of lcd based digital alarm clock with digital thermometer using 8051/89c51..
....etc

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Abstract:

We build a simple and inexpensive three digit display. It's a voltmeter module but it has also general purpose digital IO pins. You could use it as well to read a digital sensor and display the value. It can be freely programmed, calibrated and even be programmed with a non linear formula. It's a display where you can define the relation between the measured value and the displayed number. The ICL7107 is a high performance, low power, 3.5 digit analog to digital converter. The IC includes internal circuitry for seven segment decoders ....etc

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Prepared by:
Debashish Mishra




BACKGROUND

The significance of power factor (PF) correction is reflected in the large number of documents addressing this subject, in the engineering design effort, and in the numerous industrial plants that manufacture equipment for the control of reactive power and filtering of current harmonics . Some of the benefits derived from correct PF adjustment are:
1. reduced energy loss;
2. released generation, transmission, distribution, and substation capa ....etc

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high low volt cut off with delay alarm circuit ppt for pdf

Abstract

This straight forward circuit will protect electrical appliances from over voltage as well as under voltage. The circuit also produces an alarm when the power supply comes back. An ideal circuit for home to protect your valuable equipments from voltage fluctuations. The same circuit with some modifications can be used to make a automatic voltage stabilizer.

When the mains voltage is in the normal level, the voltage at the negative terminal of zener diode D4 will be less tha ....etc

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Abstract

The main objective of the project is to develop a GSM based energy meter reading system and load control through SMS. Electricity department sends employees to take meter reading every month, which is an expensive and time consuming job. The proposed project provides a convenient and efficient method to avoid this problem.The electricity department and the user can get the readings of the energy meter of consumers via SMS. The loads can also be controlled by the user of this system via SMS using this project.A microcontroller input is ....etc

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To get full information or details of 6 volt smps circuit diagram please have a look on the pages

http://seminarsprojects.net/Thread-computer-smps-power-supply

if you again feel trouble on 6 volt smps circuit diagram please reply in that page and ask specific fields in 6 volt smps circuit diagram ....etc

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