circuit harness wiring

Showing posts with label frequency. Show all posts

Sunday, December 22, 2013

The ultra high frequency broad band interference technology

The ultra high frequency broad band interference technology is adopted for mobile phone jammer .
mobile phone jammer should not exist within 300m around the school
Nokia mobile phone sales channels on a different phone model distribution rights, differentiated marketing. This would solve the contradiction between the different channel partners, resulting in

the difference between management In the long run, Nokia needs to make a variety of strategies to form a "combined" in order to maintain the sales of mobile phone products in the market. 2012

Chinese mobile phone industry development impact factor analysis? Favorable and unfavorable factors of the development of the industry (1) a favorable factor. The continued growth in demand for

mobile phones for the mobile phone industry in the development of a broad open space ITU survey results show that, with the continuous expansion of the global mobile communications network

coverage.The shielding range of this kind of mobile phone jammer is 0-70m.
Alternatives in many industries, enterprises will directly compete with other industries, production company. The existence of alternative products for the price of the products set the upper

limit, when the price exceeds the upper limit, users will switch to alternative products. When the cost reduction alternative to lower prices or the user to switch to alternative products,

alternative products competitive pressures will increase. In the current market competition, the phone is facing the challenge of other products. For example, in the city now, public phone, IC card

phone is more convenient and can be seen everywhere, on many occasions, and cheap calls to seize the opportunity to part of the low-income consumer phone. The technology of mobile phone jammer is

independently researched by the company.Here are the total positions of mobile phone jammer
This was in line with the situation of the domestic mobile phone. From 2006, major international mobile phone brands integrate their marketing channels, and increased efforts to develop low-end

mobile phone, a large number of thousand or even lower models, but this piece has been made mobile phones occupy the market has been broken.

Saturday, April 13, 2013

Tuned Radio Frequency TRF Receiver

Super heterodyne receivers have been heavily produced due to the fact round 1924, but for reasons of value did not become a hit except the Nineteen Thirties. Before the 2d world war different, more practical receiver technologies any suchs the TRF receiver and the regenerative receiver were nonetheless popular.

Circuit diagram :

$\"Tuned$

Tuned Radio Frequency (TRF) Receiver Circuit Diagram

The circuit described here is in accordance with the old technology, however brought updated a The most vital part of the circuit is the input stage, the place certain comments is used to reach good sensitivity and selectivity. The first stage is adjusted in order that it isn't moderately on the level of oscillation. This will increase the gain and the selectivity, giving a slender bandwidth. To do so, the potentiometer connected to the drain of the FET need to be adjusted very carefully: top-quality efficiency of the receiver depends on its environment. In best prerequisites a couple of strong stations must be out there right through the day the use of a 50 cm antenna. At night time, several times this number should be available.

The frequency range of the receiver runs from 6 MHz to 8 MHz. This vary quilts the forty nine m and the forty one m shortwave bands during which many European stations broad-cast. Not bad for one of these easy circuit! The circuit appoints six transistors. The first stage is a selective amplifier, followed via a transistor detector. Two low-frequency amplifier degrees full the circuit. The last stage is a push-pull arrangement for most effective force of the low-impedance loud-speaker. This circuit association is some-times referred to as a ‘1V2 receiver’ (one preamplifier, one detector and two audio frequency ranges).

Setting-up is easy. Adjust P1 unless the purpose is reached the place the circuit starts to oscillate: a whistle might be heard from the loudspeaker. Now back off the potentiometer except the whistle stops. The receiver can now be tuned to a broad-caster. Occasional further adjustment of the potentiometer is also required after the station is tuned in. The receiver functions from a provide volt-age of between 5 V and 12 V and makes use of little or no current. A 9 V PP3 (6F22) battery will have to give an extraordinarily long life.

http://www.ecircuitslab.com/2012/02/tuned-radio-frequency-trf-receiver.html