Transistor Amplifier

Thread Starter

ckhaos99

Joined Feb 12, 2012
2
I'm trying to use a mosfet transistor to create an amplifier to boost a square wave up to around 8v. The problem I am encountering is that the load resistance connected to the drain terminal is very small, around 3-5Ω and this is limiting the gain of the amplifier which I want around 20. Would a BJT or FET voltage follower between them be enough to make this work?
 

Audioguru

Joined Dec 20, 2007
11,249
A Mosfet makes a poor voltage follower because its gate voltage must be much higher than its source voltage.
Use one transistor (not a Mosfet) for voltage gain then use a power transistor (not a Mosfet) for the high current that is needed.
 
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