Op Amp: Difference between revisions

Revision as of 01:38, 6 July 2020

Simplest op amp circuit

Amplifies the input voltage. Cannot go below unity.

For high power, output can go through a transistor.

Uses positive feedback.

I had to do the math analysis to understand this. Configuration is a differential amplifier.

I have a 741 and the lowest it will go is to 1.9V, but it can go all the way up to V+. Which kind of sucks, because it can't easily drive N fets.

I tested this on a 2n7000 and the active region is really around a Gate-Source voltage of 1.2v, so the 741 doesn't go low enough.

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 == Real Op Amps ==
-I have a 741 and the lowest it will go is to 1.9V, but it can go all the way up to V+. Which kind of sucks, because it can't easily drive N fets. This may not be an issue, it looks like 2V is essentially off for most N Fets. Need to test.
+I have a 741 and the lowest it will go is to 1.9V, but it can go all the way up to V+. Which kind of sucks, because it can't easily drive N fets.
+I tested this on a 2n7000 and the active region is really around a Gate-Source voltage of 1.2v, so the 741 doesn't go low enough.
 [[Category:Electronics]]