BB179,335

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A diode that acts as a variable capacitance, commonly known as a varicap, varactor or tuning diode, is a variable-capacitance diode designed to exploit the voltage-dependent capacitance of a reverse-biased PN junction. A varicap is operated by applying a variable bias to control its capacitance. This variable bias can be achieved, for example, by controlling the voltage of a reverse bias or by using a field-effect transistor (FET).

BB179,335 is a general-purpose varicap with high quality and excellent performance. It is available in a single package and has a capacitance range of 3 to 28 pF. It can be used in a wide range of applications, such as tuning, FM demodulation and signal processing.

The BB179,335 varicap employs a PN junction to form a reverse biased diode. This diode is connected between two pins and a bias voltage is applied across it. When the bias voltage varies, the width of the depletion layer–and thus the capacitance–varies as a result. This phenomenon is known as the voltage-dependent capacitance effect. Thus, this varicap can be used to adjust the capacitance of a circuit by varying the bias voltage.

The working principle of BB179,335 can be illustrated as follows. When a negative voltage is applied, the diode junction is reversed biased, meaning that current does not flow between the two pins. As a result, the depletion layer widens, thereby increasing the capacitance across the junction. Conversely, when a positive voltage is applied, the diode junction is biased in the forward direction, meaning that current flows between the two pins and the depletion layer narrows, thus reducing the capacitance. Therefore, by varying the bias voltage, the capacitance across the junction of the BB179,335 can be changed accordingly.

BB179,335 can be widely used in applications such as FM demodulation and signal processing. Its variable capacitance makes it ideal for applications in which the capacitance of a circuit needs to be adjusted. In FM demodulation, for example, a varicap is used to adjust the capacitance of an FM discriminator to match the channel spacing of the broadcast channel. This helps to ensure that the intended station is tuned in without any distortion.

BB179,335 can also be used in signal processing applications, such as for filtering, resonating, and timing applications. For example, its variable capacitance can be used to tune a filter to cut out unwanted frequencies or to adjust its resonance frequency. In addition, a varicap can be used to adjust the timing of a circuit by altering the capacitance of a timing circuit. This can be useful in applications such as motor control, in which precise timing is required.

In summary, BB179,335 is a general-purpose varicap with high quality and performance. Its variable capacitance can be used to adjust the capacitance of a circuit by varying the bias voltage. It can be used in a wide range of applications, such as FM demodulation, signal processing, and motor control. Therefore, it is an ideal solution for tuning, filtering, resonating, and timing applications.

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