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S.Kaushik

WHY A TRANSISTOR

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It has been a long time since d transistors dethroned vaccum tubes .. they have become highly popular that it will be really hard for someone to find a electronic circuit without a transistor .. though transistor has a large number of advantages it hyas it's own disadvantage .. for a transistor to work u need to supply a signal voltage as well as something called as Vcc ... even this wont be sufficient to make it  work as an amplifier u also need to have a external bias voltage i.e. it requires in addition 2 more DC sources other than d signal voltage ... So why not we find something thst always works in the active mode so that u dont need that external bias .. anyway u will need Vcc for anything to work as an amplifier if u dont hv an Vcc u cant amplify as it will be voilating Law of Conservation of Energy ..  :) .. If u too had been fed up with transistor lets look for a new one :)

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If you connect a transistor properly, bias it properly and add enough negative feedback to reduce its distortion then a transistor makes a good amplifier. Many transistors make an excellent amplifier like the ones in ICs.

If you don't like transistors then you can make an amplifier with Mosfets.

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i thought mosfets were transistors
i thought it stood for something feild effect transistor

There are different kinds of field effect transistors:
1) Junction field effect transistors are low current and low power. They are N-channel or P-channel. Most are fully turned on when their gate voltage is the same as their source voltage (no bias voltage). They become turned off when the gate is reversed-biased.
2) Mosfets are metal-oxide field effect transistors and are mostly high current and high power.
They are also N-channel or P-channel. The gate is a capacitor that has a breakdown voltage of about 20V. A Mosfet is fully turned on when its gate has a forward bias voltage of about 10V. They are turned off when their gate voltage is the same as their source voltage.

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