Microcontroller Based Projects by EFY Enterprises Pvt Ltd

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By EFY Enterprises Pvt Ltd

This publication is number of fifty one microcontrollers-based tasks, which appearead in Electronics For You from 2001 to 2013. it's a compilation of fifty one development tasks established at EFY Labs. this can be the second one version of the Microcontroller dependent initiatives booklet. accordingly, it has the entire fabrics lined within the first version, and likewise comprise 25 new initiatives with a few new microcontrollers no longer covereed within the first version. This publication, a set of fifty one microcontroller-based initiatives, which seemed in Electronics For You in the course of 2001-2012 is introduced out for the advantage of our new readers.The publication has been divided into 5 sections comparable as within the first variation viz : safety structures, household functions, business purposes, size, demonstrate platforms and Robotics. even if, many new tasks were brought in moment version.

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The signal-to-noise ratio of a communications system is 20 dB. If the signal power is increased by a factor of 5 : 1, the noise remaining unaltered, determine the new signal-to-noise ratio in decibels. 3. Explain why power cannot be expressed directly in decibels, and what is meant by the unit dBm. The input power to a transmission line is 13 dBm. The line introduces an attenuation of 6 dB between input and output. Calculate: (a) the output power in dBm; (b) the output power in milliwatts; (c) the input power in milliwatts.

25 < -v 230 240 250 Frequency, kc/s FIG. 3. The spectrum graph for the wave of Fig. 2. F. 0·5νΐ 0-5vJ_ 1-5V Carrier Time LSF trwwwv f 0 - f s = 230 kc/s V5V j 0-5VJ FIG. 4. The carrier and side frequencies for the wave of Fig. 2. gether to give the modulated wave of Fig. 2. The addition process is similar to that already described in connection with Fig. 3. 4. Carrier modulated with speech or music It has already been shown that speech and music signals con­ sist of a number of waves (fundamentals and their harmonics).

This considerably reduces the physical size of the capacitor, but at a corresponding large increase in price. ). Paper Foil crimped at ends to make connection Foil FIG. 6. Paper-foil capacitor; suitable for low frequencies. Electrolytic-type capacitors employ some form of oxide coating as a dielectric, usually aluminium oxide. This has a high relative permittivity and can be made extremely thin without showing electrical breakdown. For the normal type, see Fig. 7(a), the polarity of voltage is important, as reverse voltage destroys the oxide film.

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