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Old 16th November 2010, 08:42 AM   #1
diyAudio Member
Join Date: Nov 2010
Default building an amplifier

our professor asked us for our project to build an amplifier consisting of two pre-amplifiers with controlled voltage gain of 40 and 100 respectively and cascaded with a power amplifier using a class ab mosfet

i would like to use a common emitter (40) and common collector (100) as pre-amplifiers..

any suggestions on how can i build this one?. please
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Old 16th November 2010, 09:53 AM   #2
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
read up on the operation of common collector and common emitter amplifiers.
Particularly that common collector (=emitter follower) have a voltage gain of <1
These can be used as a buffer, but not as a voltage amplifier.

A gain of 40times (+32dB) is asking a lot from a single stage of common emitter amplifier.
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 16th November 2010, 11:26 AM   #3
DF96 is offline DF96  England
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Join Date: May 2007
My suggestion: learn how to do it, do it, write it up with proper attribution of sources. That is called education.

Alternatively, get someone else to tell you how to do it, get them to guide you minute by minute as you debug it, then write it up without mentioning all the help you received. That is politely called plagiarism; it used to be called cheating.

Assuming you want to take the first option, where are you starting from? It is difficult to advise you what to read until we know what you already understand.
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Old 16th November 2010, 11:51 AM   #4
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Join Date: Aug 2010
Location: Philippines
Your fortunate you have such projects and your instructor maybe teaches you the characteristics and uses of MOSFET,

im already a graduating student but still only the basic characteristics are taught to us,..(is MOSFET amplifier expensive) we have made amplifiers but uses only MJ2955 and 2N3055 transistor... i think there are many more knowledge that is lacking to me... in the amplifier we build it cost me around 7 to 8K pesos..
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