Electronics > Beginners
LM741 connections with signal generator
Gazmon:
I’m guessing that from my experiments based in the above my output readings will also vary based on my protection resistors fitted
Is this correct?
I am getting a sine wave now 👍
iMo:
You should not see any visible difference with or without the protection resistors.
rstofer:
--- Quote from: Gazmon on March 31, 2019, 09:45:21 pm ---I’m guessing that from my experiments based in the above my output readings will also vary based on my protection resistors fitted
Is this correct?
I am getting a sine wave now 👍
--- End quote ---
No, see Rule 1 here:
No current flow, no voltage drop. Now, in reality there is a tiny current flow (see datasheet 'Bias Current') that could be as high as 1.5 uA. This would drop 1.5V if the input resistor was 1 Mohm but at 1k, it drops 0.0015V and that's worst case.
Watch Dave explain op amps, it will help.
Gazmon:
The video is spot on thank you
If I want to check some measurements with my multimeter based my setup and the info in previous posts, I can do this between 0v and the output pin ?
rstofer:
In general, that ground between the two batteries is the reference voltage for ALL measurements. There is simply no other point that works. Ground is ground for everything: Scope, signal generator, DMM, everything.
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