# Calculate amplifier gain?

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#### ayamingesh

##### Newbie level 4
Need help with calculating the gain.

1: Calculate the "raw gain" of the amplifier. Ar=Vut/Vin
2: Calculate the gain of the amplifier. Av=Vut/Vs

What is the difference between "raw gain" and gain?
Sorry for the bad translation, I don't even know if "raw gain" is the correct term in english, haha.

http://img827.imageshack.us/img827/9972/namnls2m.png

#### Junus2012

Hello
you mean to say the voltage gain Av or Avs

the difference between Av and Avs is expressed inthe equations below
Av=V0/Vin
where Vin = (Rin / Rin+Rs). Vs

Avs = Vo/Vs

in the first equation (Av) we considering the voltage drop on the source resistance Rs while in the later one (Avs) the gain is calculated prior the source resistance drop

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