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The generator of AM EMFs consists of a battery-driven radiofrequency (RF) EMF generator connected to a 1.5 m long 50 ? coaxial cable, to the other end of which a stainless-steel spoon-shaped mouthpiece is connected via an impedance transformer. The RF source of the device corresponds to a class C amplifier operating at 27.12 MHz. The carrier frequency is AM with a modulation depth of 85±5%, whereas the modulation frequency is generated by a digital direct synthesiser with a resolution of 10-7. The treatment sequence is controlled by a microcontroller (Atmel AT89S8252, Fribourg, Switzerland), that is, duration of session, sequence of modulation frequencies and duration of each sequence can be programmed via PC over a RS232 interface. The RF output is adjusted to 100 mW into a 50 ? load, which results in an emitting power identical to that of the device used for the treatment of insomnia.
Q. A six-pole, double-layer dc armature winding in 28 slots has five turns per coil. If the field flux is 0.025 Wb per pole and the speed of the rotor is 1200 r/min, find the value
3-phase 3 wire meter with CT and MD It is exactly such as 3-phase 4 wire meter and works on the similar principle. It is also used in the similar way and under the similar cir
Q. Define Number Systems? A number system, in general, is an ordered set of symbols (digits) with relationships defined for addition, subtraction, multiplication, and division.
develop and explain series and parallel magnetic circuits?
Ask questiochan #Minimum 100 words accepted# characteristics of transformer
conclusion about electrical engireng??
Technical Loss in Electrical Systems Technical loss is inherent in electrical systems, as all electrical devices have a few resistances and the flow of currents causes a power
Explain the NAND Gates - Microprocessor? The NAND GATE is a AND gate with the output inverted. Consequently the outputs of a NAND gate would be the opposites of the outputs of a A
how thyristor work in speed control??
Q. Show NPN Common Collector Amplifier? The common collector amplifier, often called an emitter follower since its output is taken from the emitter resistor, is useful as
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