S.Kaushik Posted April 13, 2007 Report Share Posted April 13, 2007 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 :) Quote Link to comment Share on other sites More sharing options...
audioguru Posted April 13, 2007 Report Share Posted April 13, 2007 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. Quote Link to comment Share on other sites More sharing options...
quincy Posted May 30, 2007 Report Share Posted May 30, 2007 i thought mosfets were transistorsi thought it stood for something feild effect transistor Quote Link to comment Share on other sites More sharing options...
audioguru Posted May 30, 2007 Report Share Posted May 30, 2007 i thought mosfets were transistorsi thought it stood for something feild effect transistorThere 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. Quote Link to comment Share on other sites More sharing options...
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