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Bharat Heavy Electrical Limited model Exam Paper
... d.)None of the above A transistor with hie = 1.5 k and hfe = 75 is used in an emitter follower circuit where R1 and R2 are used for normal biasing . Approximate value of it’s current amplification isa.)75b.)76 c.)75/76 d.)-75 Amplifier of class B has high theoretical efficiency of 78.5 percent b ...
... d.)None of the above A transistor with hie = 1.5 k and hfe = 75 is used in an emitter follower circuit where R1 and R2 are used for normal biasing . Approximate value of it’s current amplification isa.)75b.)76 c.)75/76 d.)-75 Amplifier of class B has high theoretical efficiency of 78.5 percent b ...
APPLICATION NOTE --- AN056
... If an output return loss measurement is made without the correct input signal present, the results will be significantly different from the real “hot S22” measurement results, due to the change in the device characteristics between the stimulated and un-stimulated conditions. So, simple VNA S22 meas ...
... If an output return loss measurement is made without the correct input signal present, the results will be significantly different from the real “hot S22” measurement results, due to the change in the device characteristics between the stimulated and un-stimulated conditions. So, simple VNA S22 meas ...
High Frequency Amplifier Evaluation Board
... C5, C8, and C10 should be 10nF disc ceramics with a selfresonant frequency greater than 10MHz. The polarized capacitors (C2, C4, C7, and C9) should be 1µF to 10µF tantalums. Most 10nF ceramics are self-resonant well above 10MHz, and 4.7µF solid tantalums (axial leaded) are self-resonant at 1MHz or b ...
... C5, C8, and C10 should be 10nF disc ceramics with a selfresonant frequency greater than 10MHz. The polarized capacitors (C2, C4, C7, and C9) should be 1µF to 10µF tantalums. Most 10nF ceramics are self-resonant well above 10MHz, and 4.7µF solid tantalums (axial leaded) are self-resonant at 1MHz or b ...
4 Loudspeaker Impedance
... Loudspeakers are typically specified with nominal impedance, often 8 Ohms or 4 Ohms, although other values are possible. The actual impedance of a typical loudspeaker can vary widely from this rating. In the exercise we shall examine the impedance of two different permanent magnet-voice coil type tr ...
... Loudspeakers are typically specified with nominal impedance, often 8 Ohms or 4 Ohms, although other values are possible. The actual impedance of a typical loudspeaker can vary widely from this rating. In the exercise we shall examine the impedance of two different permanent magnet-voice coil type tr ...
TDA7000 RX FM Receiver
... the right side and vice versa. The preceding 10k resitors ensure that neither input can be "shorted" to earth. Amplification of the audio signal is provided by a single stage common emitter amplifier and then via a direct coupled emitter follower. Overall gain is less than 10 but the final emitter f ...
... the right side and vice versa. The preceding 10k resitors ensure that neither input can be "shorted" to earth. Amplification of the audio signal is provided by a single stage common emitter amplifier and then via a direct coupled emitter follower. Overall gain is less than 10 but the final emitter f ...
Bipolar transistors II, Page 1 Bipolar Transistors II
... 100Ω. As the current increases do you note any change in the curve? If yes, comment on possible reasons. Note: The zener-regulated pass transistor developed in this lab is an acceptable source of stable voltage to be used when circumstances are not demanding. Transistorized power supplies with two o ...
... 100Ω. As the current increases do you note any change in the curve? If yes, comment on possible reasons. Note: The zener-regulated pass transistor developed in this lab is an acceptable source of stable voltage to be used when circumstances are not demanding. Transistorized power supplies with two o ...
Zobel network
![](https://en.wikipedia.org/wiki/Special:FilePath/SB_test_room_1959.jpg?width=300)
For the wave filter invented by Zobel and sometimes named after him see m-derived filters.Zobel networks are a type of filter section based on the image-impedance design principle. They are named after Otto Zobel of Bell Labs, who published a much-referenced paper on image filters in 1923. The distinguishing feature of Zobel networks is that the input impedance is fixed in the design independently of the transfer function. This characteristic is achieved at the expense of a much higher component count compared to other types of filter sections. The impedance would normally be specified to be constant and purely resistive. For this reason, they are also known as constant resistance networks. However, any impedance achievable with discrete components is possible.Zobel networks were formerly widely used in telecommunications to flatten and widen the frequency response of copper land lines, producing a higher-quality line from one originally intended for ordinary telephone use. However, as analogue technology has given way to digital, they are now little used.When used to cancel out the reactive portion of loudspeaker impedance, the design is sometimes called a Boucherot cell. In this case, only half the network is implemented as fixed components, the other half being the real and imaginary components of the loudspeaker impedance. This network is more akin to the power factor correction circuits used in electrical power distribution, hence the association with Boucherot's name.A common circuit form of Zobel networks is in the form of a bridged T. This term is often used to mean a Zobel network, sometimes incorrectly when the circuit implementation is, in fact, something other than a bridged T.Parts of this article or section rely on the reader's knowledge of the complex impedance representation of capacitors and inductors and on knowledge of the frequency domain representation of signals.↑