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electricalstudent · 8 months ago

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A BJT common emitter amplifier is shown below using the small-signal T model with parameters α and re. If beta 120, Re 90 ohms, and gm - 200 mA/V, what is the value of the small signal input resistance, Rin, expressed in ohms?

#CE amplifier with emitter resistance #common emitter amplifier solved problems #input resistance of an amplifier

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seo411 · 2 years ago

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Common Audio Issues and the Best Solutions

Good audio is often underrated in both school and business. Research shows that poor audio makes a bad impression in conferencing settings, leading to negative assumptions about the speaker's trustworthiness and competence. In the classroom, poor audio can worsen student performance and engagement because they can't hear everything. Those are big problems, and many organizations are interested in solving them. But how can these issues be solved? Here, we've included some of the most common audio problems facing companies and schools, and what can be done about them. Problem: People in the Back are Having Trouble Hearing Insufficient volume is one of the most common audio issues, and it plagues both professional and classroom settings. In large boardrooms, training rooms and classrooms, sound doesn't reliably reach the back of the room. Whether it's due to too much space or too much interfering noise, the people in the back are going to have trouble understanding what's being said. The solution to this is audio enhancement technology. Audio enhancement solutions typically consist of a worn or handheld microphone, one or more speakers, an amplifier and a control device of some kind. Some notable solutions include Audio Enhancement's Optimum system and FrontRow's Juno and ezRoom systems. These solutions blanket a room with even, crisp audio that ensures everyone can hear - including those way in the back. Problem: Background Noise is Interfering with a Conference Call Professionals are spending more time than ever in conferences, which means they're spending more time than ever dealing with unwanted background noise. Whether at home (rowdy children, pets) or in the office (paper rustling, loud hallway conversation), conference calls are frequently interrupted by ambient noise. There are a couple of solutions. One is to invest in conferencing technology that automatically detects and blocks background noise. Poly's audio conferencing equipment is notable for its noise-suppressing features, including Acoustic Fence and NoiseBlock AI. These automatically detect unwanted noise and shut down the microphones that are picking them up. Another solution for conference rooms is to install a white or pink noise emitter. Both emit a constant stream of low-frequency sound that acts like a screen between the conference room and everything outside. Problem: Background Noise is Interfering with a Classroom Classrooms also have trouble with ambient noise because schools are rarely quiet places. Here, white and pink noise emitters can also work. Most noise emitters operate at close range, so they don't become a distraction themselves. Audio enhancement can also be the solution here, as it boosts volume to a point where outside audio is no longer perceptible. Problem: There are Audio Delays Between Participants During Conferencing Any stuttering during a conferencing session could be a network issue. If there are too many participants on the call, it can stress your network beyond the breaking point, which results in significant data loss between endpoints. The fix here may be optimizing your network's performance, which may require expanding your network capabilities or maintaining what you already have. As networks broaden more and more, organizations are turning to cloud-based services, including video conferencing services. Cloud-based services balance network loads, so they can deliver a reliable conferencing experience. If your organization is relying on on-premises solutions, migrating to a cloud option may help. It's also possible that delays are emerging from the audio system itself. This may happen when multiple people speak into the microphone at once. If that does happen, attentive muting can help. Improved audio solutions can also help, as older audio systems are more likely to have issues with delays. Problem: There's an Echo in Here Echoes are a long-standing issue for conference calls and they're extremely distracting. When echoes are present, it's typically due to input devices - like microphones - picking up the same audio more than once. This could be something as simple as two input devices in the room feeding into a single conference. An example would be two active microphones in the same room. Sometimes, though, the echo's source is from the room itself. Most office buildings were not designed and built with acoustics in mind, and it shows. Build materials, the room's size and its layout all affect how sound travels through the space. Glass and concrete, for example, reflect a lot of sound that can bounce back into the microphone. Covering reflective surfaces with sound-absorbing materials can help. Items in the room can also influence acoustics. How those items and furniture are arranged will also make an impact, so there's a lot to account for. Given this widespread problem, there are furniture and decorative items designed to improve the acoustics of a room. Hanging baffles are one example, as is sound-absorbing furniture. If you're not sure about the state of your building's acoustics, certified AV integrators have software they can use to model it. This information is then used to develop more effective audio solutions. Problem: My Organization Doesn't Have In-house AV Personnel to Implement Audio Solutions Of course, effective audio solutions require effective planning, design, and installation. If your organization doesn't have an in-house AV team capable of implementing audio and video technologies, an integrator can help. Certified integrators perform a thorough needs analysis and site survey prior to implementing any audio solutions. Together, this provides integrators with the information they need to select the right technologies, design the audio solution, install it, configure it, and train all users on its function. With an integrator's help, your organization can achieve higher quality audio while sticking to any timeline and budgeting limitations. Better audio makes a difference, and an integrator can provide it for your company or school. Read the full article

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printingproducts0318 · 5 years ago

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What the common problems while install and debug IR touch frame

Infrared touch frame employs light emitting diodes and detectors which are embedded into a bezel around the display and emit and detect rows and columns of infrared light across the surface of the screen. This makes an invisible grid of infrared beams and also on the other side of the screen from the emitters, photodetectors or sensors identify touch when the plane of the grid has been broken by a finger touch (or other solid object). In other words, infrared touch displays operate on the grounds of light-beam interruption, commonly known as beam break, to ascertain the location of signature occasions.

Because of improper use or installation errors, IR touch frame screen often encounter many problems during use. Based on customer feedback, we have summarized some common problems during installation and use, so that users can better deal with emergencies.

Question 1: When the touch frame is connected to the computer, only a single point can be drawn.

Please check the computer's operating system. XP and Win7 Home Basic Edition can only support single point; Win7 Home Premium, Win7 Professional, Win7 Ultimate and Win8/Win10 systems support multiple points. If the installed version is the full version, not the Ghost version.

Problem 2: The touch is not precise and the touch point is deviated.

This problem can be solved by software by calibration, or contact us (Jingyan Electronics) for instructions on touch box operation.

Question 3: How to change the position of the USB cable in the lower left corner during installation.

The default outlet position of the USB cable of Jingyan electronic infrared touch frame is fixed at the lower left corner. If you want to change it to another position, you must confirm the change with the technician before custom processing.

Question 4: When the touch frame is connected to the computer, it cannot be touched.

(1) Check whether the USB cable of the touch frame is properly connected to the USB port of the computer;

(2) Check whether the USB port of the computer is compatible with USB2.0;

(3) Try to replace other USB ports;

Question 5: Touch failure or random jumping phenomenon.

When installing the touch frame, the strong current and the weak current must be separated, and they cannot go together. The strong current radiation is very strong, which will cause interference to the touch frame, causing random jumps or disconnection of the touch.

Check the touch signal after installation.

Question 6: The USB cable transmission distance between the touch frame and the host computer.

The USB extension cable can be used directly within 10 meters;

USB extension cable with amplifier for 10-20 meters;

Above 20 meters, use an amplifier with external power supply and network transmission.

Question 7: When installing the ir touch frame, what are the requirements for the glass?

When installing the infrared touch frame, it must be close to the surface of the glass. At the same time, the glass must be flat, and the middle must not be raised. The projections will block part of the infrared light.

When installing a large splicing screen, it is recommended that the glass be 5-10mm high on both ends of the X side of the touch frame to make the glass concave inward, which is beneficial to the use effect.

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paper1125 · 5 years ago

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What the common problems while install and debug IR touch frame

Infrared touch frame employs light emitting diodes and detectors which are embedded into a bezel around the display and emit and detect rows and columns of infrared light across the surface of the screen. This makes an invisible grid of infrared beams and also on the other side of the screen from the emitters, photodetectors or sensors identify touch when the plane of the grid has been broken by a finger touch (or other solid object). In other words, infrared touch displays operate on the grounds of light-beam interruption, commonly known as beam break, to ascertain the location of signature occasions.