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    ELectrical Systems Work

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    shamarasharpe48
    The document discusses different types of diodes including Zener diodes, LEDs, photodiodes, and point contact diodes. It provides details on the pictorial view, schematic symbol, construction, operation/function, purpose, and characteristics curve for each diode type. The key points covered are that Zener diodes regulate voltage, LEDs emit light, photodiodes detect light, and point contact diodes were early rectifiers but have been replaced by modern PN junction diodes.

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    © All Rights Reserved
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    ELectrical Systems Work

    Uploaded by

    shamarasharpe48
    12 views7 pages
    The document discusses different types of diodes including Zener diodes, LEDs, photodiodes, and point contact diodes. It provides details on the pictorial view, schematic symbol, construction, operation/function, purpose, and characteristics curve for each diode type. The key points covered are that Zener diodes regulate voltage, LEDs emit light, photodiodes detect light, and point contact diodes were early rectifiers but have been replaced by modern PN junction diodes.

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    The document discusses different types of diodes including Zener diodes, LEDs, photodiodes, and point contact diodes. It provides details on the pictorial view, schematic symbol, construction, operation/function, purpose, and characteristics curve for each diode type. The key points covered are that Zener diodes regulate voltage, LEDs emit light, photodiodes detect light, and point contact diodes were early rectifiers but have been replaced by modern PN junction diodes.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    12 views7 pages

    ELectrical Systems Work

    Uploaded by

    shamarasharpe48
    The document discusses different types of diodes including Zener diodes, LEDs, photodiodes, and point contact diodes. It provides details on the pictorial view, schematic symbol, construction, operation/function, purpose, and characteristics curve for each diode type. The key points covered are that Zener diodes regulate voltage, LEDs emit light, photodiodes detect light, and point contact diodes were early rectifiers but have been replaced by modern PN junction diodes.

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    © All Rights Reserved
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    Shane Cunningham

    11r

    Electrical Systems

    Project On Diodes

    Zener Diode

    Pictorial View:

     A Zener diode looks similar to a regular diode, often with a cylindrical or tubular shape.

     It has two leads extending from its ends.

    Schematic Symbol:

    Construction:

    Operation/Function:

     Zener diodes operate in the reverse breakdown region.

     When a reverse voltage (greater than the breakdown voltage) is applied, the diode
    allows current to flow, maintaining a relatively constant voltage across it.
    Purpose:

     Zener diodes are primarily used for voltage regulation and stabilization in electronic circuits.

     They are often employed in voltage reference circuits, voltage regulators, and power supply
    applications.

    Characteristics Curve:

    Light Emitting Diode (LED)

    Pictorial View:

     An LED typically looks like a small, colored, or clear bulb. It has two leads or terminals, with
    the longer one usually representing the positive (anode) side.

    Schematic Symbol:
    Construction:

    Operation/Function:

     LEDs operate on the principle of electroluminescence. When current flows through the
    semiconductor material, electrons combine with electron holes, releasing energy in the form
    of photons (light).

     The color of the light emitted depends on the semiconductor material used.

    Purpose:

     LEDs are widely used for various purposes, including indicator lights, display panels, lighting
    applications, and as components in optoelectronic devices.

     They are energy-efficient, have a long lifespan, and are often used as replacements for
    traditional incandescent bulbs.

    Characteristics Curve:
    Photo Diode

    Pictorial View:

     A photodiode typically looks like a small semiconductor device with two leads or terminals.
    The actual appearance may vary depending on the specific packaging, but it generally has a
    flat surface on one side that serves as the light-sensitive area.

    Schematic Symbol:

    Construction:

    Operation/Function:

     Photodiodes operate based on the principle of the photoelectric effect. When photons (light
    particles) strike the semiconductor material, they generate electron-hole pairs.

     The generated electrons and holes contribute to a photocurrent, creating a flow of electric
    current in response to incident light.
    Purpose:

     Photodiodes are commonly used for light detection and sensing applications.

     They find applications in devices such as light meters, optical communication systems,
    photovoltaic cells, and various sensor applications where the intensity of light needs to be
    measured.

    Characteristics Curve:

    Point Contact Diode

    Pictorial View:

     A point-contact diode typically consists of a small metal wire (the point contact) in close
    proximity to a semiconductor crystal (such as germanium or silicon). The metal wire serves as
    one of the diode's electrodes.
    Schematic Symbol:

    The schematic symbol for a point-contact diode is often represented as a triangle with one side having
    a small line or triangle, indicating the point contact. The other side represents the semiconductor
    material.

    Construction:

    Operation/Function:

    The point-contact diode operates on the principle of rectification. When a small wire (point contact)
    touches the semiconductor crystal, it creates a rectifying junction.

    The metal-semiconductor junction allows current to flow more easily in one direction (forward biased)
    than the other (reverse biased), providing rectification functionality.

    Purpose:

    Point-contact diodes were historically used in early radio and radar applications as rectifiers for signal
    demodulation.

    However, their use has diminished over time, and more modern semiconductor diodes with P-N
    junctions are now prevalent due to their better performance and reliability.

    Characteristics Curve:

     The characteristics curve of a point-contact diode would show the relationship between the
    forward and reverse bias voltage and the resulting current.

     It would demonstrate the rectifying behavior, with a significant difference in current flow
    between forward and reverse bias.

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