gmrs amplifier

The training and 2015 National Electronic Design competition is over.Many things were learned during the training period.Just started to use 2sc3355 to do 1.4GHz RF amplifier, using Microstrip line to do transmission line, on the Vector Network Analyzer to observe the parameters such as S11,S12,S21,S22. The amplifier effect is not very good. This and the circuit layout and general capacitance inductance in

Voice at command reference Note:Some modem do not have the voice communication function. The following table lists the voice AT commands that your modem can understand, including the Sound Amplifier command and the Tam command. Each Command description includes the command name, explanation, and related parameters. Remember:Your modem must be in Microsoft Windows 95 and cannot work in a MS-DOS or Microsoft Windows old version.

A. Set the restart time for the router If you have to restart the router from time to time to prevent disconnection, then there is such a solution. You can do a few experiments to determine whether the machine is overheating, aging, or downloading too much, and then you just need to set the router to automatically reboot every day. You can use DD-WRT firmware or timers. In this way, you don't have to reboot the router often (this is especially appropriate for a router in the attic). After test

, but with the sound card chip signal-to-noise ratio, most of the integrated sound card signal to noise ratio of more than 75dB, some high-end products, even up to 95dB signal-to-noise, the problem of noise is getting smaller. In addition to the signal-to-noise ratio, clutter electromagnetic interference is the only reason for the noise to occur. Because some integrated sound card using a cheap power amplifier unit, workmanship and materials are more

is turned off, the Vin-vo Simplification: L i= (VIN-VO) (1-d) Vo= disadvantage due to the volt-second law: High switching frequency leads to low power supply noise Second, the Ldo circuit Ldo:ldo is the abbreviation for low dropoutvoltage regulator, which is the lower dropout linear regulator Features: Less peripheral circuit, no inductor, small footprint, Schematic diagram: Brief analysis: The sampling voltage is added to the comparator A's co-phase input, compared with the reference voltage

unit is the chip's bit width, but mainly, this relationship is only valid for SDRAM. The reasons are explained in the following article. Tip: How dram is stored The storage unit in the L-bank is the underlying storage unit, its capacity is several bits (for SDRAM, the chip's bit width), and each bit is stored in a separate storage. These are the smallest storage units in memory. You can use the relationship between the cluster and the sector in the hard disk operation to understand the storage

is recommended that dust be checked regularly and dust removed. 5. Pay attention to the order of switch machine. Start the computer/CD and other equipment, and then the amplifier. When the shutdown is reversed. The reason is to avoid the instantaneous current impact of the device boot power amplifier. For example, when the computer is not turned off, is not heard a loud "kiss". 6, switch audio, the volu

with that statement, basically everyone will not look, the direct point of space to the last input accept can). Type ' accept ' to continue or ' decline ' to ' go ' back to the previous menu:AcceptBecause we are just beta, so next choose: I want to evaluate this product or activate later next we will choose to use license file to try VTune Install evaluation SOFTW are using a license file to enter the absolute path of licence files, followed by the default Ann path (default is installed in the

Switching power supply Control mode Switching power supply in normal operation, the load in the external interference will produce fluctuations, how to ensure that the load fluctuations in the condition of the output stability needs to control the knowledge of the theory to solve. In the design of switching power supply applied to the control mode mainly divided into two: one is to monitor the output voltage, adjust the PWM duty ratio, to ensure the stability of the output voltage, that is, vol

in a theoretical discussion stage. . Optical Fiber Amplifier 1550nm bait-doped Er) fiber amplifier (EDFA), the bait-doped fiber amplifier is a digital, analog, and coherent optical communication repeater. It can transmit different bit rates and transmit optical signals of several wavelengths at the same time. During the update of the optical fiber network, the s

-click to add a task plan, next step, click Browse and find SHUTDOWN in the C: \ WINDOWS \ SYSTEM32 directory in the selection program for planning. EXE program and click the OPEN button. step 2: set the task execution time to "Daily", click Next, set the start time to "", click Next, and enter the user name and password as required, when you click Finish, open the Advanced properties of this task plan, and click Finish Step 3: In the pop-up SHUTDOWN window, click "task", and then enter "C: \ WI

current and input voltage.Unfortunately, this circuit was not very efficient.Efficiency can significantly improved with switching regulators.Fixed Output Voltage feedback networksA linear regulator includes an error amplifier that compares the voltage applied to its feedback pin to an internal re Ference.The regulator contains a controller with a feedback voltage amplifier this compares an external voltage

the rack is a systematic one, then inserting such a sense resistor may not be practical. Moreover, since the ground is not an ideal conductor, the ground voltages in different locations in the system may be different, so a differential amplifier must be used to achieve accurate measurements 2 3To overcome these current detection challenges, a high-end current sense amplifier has been created. These spe

The analog signal input of the ad conversion chip is fully differential, pseudo differential, single-ended input, where the fully differential input is the best, and at this stage the ADC converter in order to improve its performance, it is recommended that users use a fully differential input method. (AD7982, ADS8317, etc. can achieve the full differential input of the signal, figure 1 shows the application circuit of the AD7982, it is shown that the input is a fully differential input method),

audio modification of the circuit and modification of the details and skills are well-known, so modified after the sound, for our quiet is also guaranteed.The power amplifier ability of audio host:Many like the sound quality of heavy bass results, in the sound of the host amplifier is also flower through the mind, the debugging process felt good sound quality results, but in the use of the same as the inve

-speed single channel transmission, can realize the ultra-large capacity of the transmission system. Excellent solution to the problem of insufficient capacity.2. Ultra Long Distance wavelength division transmission System There is a problem that needs to be solved, that is, in the transmission to a certain distance after the light power will become smaller, then how to solve this problem? We can design the scheme--the EDFA erbium-doped fiber amplifier