Voltage gain for FET using Multisim

Thread Starter

weirdona

Joined Jan 9, 2021
1
Hi, i'm trying to get voltage gain by using the oscilloscope but i couldn't get the right value. I tried watching youtube to check where I was wrond but i still couldn't figure it out. Where am I supposed to put Channel A and Channel B of the oscilloscope to get the right voltage gain?1610204731571.png
 

Audioguru again

Joined Oct 21, 2019
3,172
The input is 6V peak so the scope channel A which is set to 5V per division produces a sinewave amplitude a little more than 2 divisions peak-to-peak as shown.
The gain will be less than (2.7k//1.2k)/1.2k= 0.9 times but the channel B is set to show 500V per division and the output of less than 16V peak-to-peak is shown correctly as almost nothing.

The 0.0082uF capacitor value is very low to pass 10Hz into 1M ohms so it causes a additional voltage loss.
 

Audioguru again

Joined Oct 21, 2019
3,172
Since the 'scope was set to show an output of 500V (!) per division then I guess he is using a miracle to obtains a voltage as high as 1000V or more to be shown.
 
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