The Corresponding Price Of The Metal Green Laster Pointer Is High

By Author: ELLIAN
Total Articles: 93
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Blue Laser PointerAbsolute error not greater than the data rate is 1%; c) output signal is TTL level. (2) design three low-pass filter, used to simulate the transmission channel of the amplitude-frequency characteristics: a) each filter-band attenuation of not less than 40dB / decade; b) three cut-off frequency of the filter of 100kHz, 200kHz, 500kHz, absolute error is less than cut-off frequency 10%; c) passband gain of AF in the range of 0.2 to 4.0 adjustable. (3) design a pseudo-random signal generator used to simulate channel noise: a) pseudo-random signal V3 is 4512 2 () 1 f xxxxx = + + + + m-sequences; b) the data rate of 10Mbps, not absolute error at 1%; c) output signal peak value of 100mV, the absolute error of less than 10%.So people don’t need to control the 100mW laser pointer by facing to the receiver. (4) the use of digital signal generator generates the clock signal V1-clock synchronization, ...
... display digital signals V2a signal eye diagram, and test eye margin. 2. Play a part (1) requires digital signal generator output V1 using Manchester encoding. (2) requires the circuit from the V2a digital signal analysis to extract the synchronization signal V4-syn and output; the same time, the use of the extracted signal V4-syn sync synchronize properly display digital signals V2a signal eye diagram. (3) requires the pseudo-random signal generator output signal amplitude adjustable V3, V3-peak range of 100mV ~ TTL level. (4) improving the digital signal analysis circuit, the lowest possible SNR synchronization signal extracted from the V2a V4-syn, and displayed correctly V2a signal eye diagram. (5) other. The controlling distance of 200mW Laser Pointer is long and it could reach to several tens of meters.Third, note 1, at the completion of the basic requirements, digital signal generator clock signal V1-clock to give digital signal analysis circuit (Figure 1, switch S is closed); play a part in the completion, V1-clock is not allowed to give digital signal analysis circuit (switch S is off). 2, requires digital signal generator and digital signal analysis produced a respective circuit board. 3, requires V1, V1-clock, V2, V2a, V3 and V4-syn signals reserved for the test port. 4, the basic requirements (1) and (3) of the two m-sequences, according to a given characteristic polynomial 1 () fx and 2 () fx, using a linear shift register generator to produce. 5mW laser pointer applying RF technology is normally high in cost.5, the basic requirements (2) require the use of analog low-pass filter circuit. 6, the eye can use the oscilloscope display, the display can also use home-made device. E-3 7, play a part (4) requires a "signal to noise ratio as low as possible", that is guaranteed to correctly extract the sync signal V4-syn under the premise of maximizing the pseudo-random signal V3 of the peak to reach the maximum, At this point digital signal analysis circuit allows the input signal V2a the minimum signal to noise ratio SNR. Fourth, the marking out of the project the main contents of the report of the demonstration program designed to compare and describe two options for calculation of theoretical analysis and design of low-pass filter m-sequence synchronous digital signal eye diagram shows the method of signal extraction circuit and program design 6 Block diagram of system components and parts.But the green laster pointer applying RF technology has no directivity, which makes it convenient to use it.