Electronics > Beginners
Can I use a Lab Bench PSU and a Function Generator at the same time?
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Brumby:
The + and - inputs to the Op amp are different to the positive and negative markings on your power supply.

For an Op amp:
 - any signal applied to the + will cause the output to move in the same direction.  When the signal goes up, the output goes up and when the signal goes down, the output goes down.  The input signal usually goes in here.
 - any signal applied to the - will cause the output to move in the opposite direction.  When the signal goes up, the output goes down and when the signal goes down, the output goes up.  The feedback loop usually runs back into here.

The output from the signal generator will typically go to the + input and the 0V point in the diagram I posted above.
codingwithethanol:
Yeah I pulled V+ and - to ground as well as the non-inverting output as in the schematic and im getting a flatline on my scope
Its getting late where I am so im going to drift off to sleep but ill be around tomorrow at the same time to wrap this little experiment up.
Thanks for your help so far, I appreciate it. I had been doing EE study before, but never really had enough equip to do anything beyond arduino gimmicks and blinking leds, so now that i do have a mini lab set up, im going to delve into more advanced stuff
xavier60:
This diagram should remove all ambiguity.
codingwithethanol:
Ok here's the scoop:

Never got it to work, as a matter of fact, while trying to figure out why the gain was literally negative, i turned off my PSU while looking at my oscilloscope and the output didn't change! Something else I discovered is that the second channel on my PSU is acting funny, I set it to 10V and it shows 4-5V with 4mA current with no load! Anyways, i've moved on to other things for the time being but ill come back to this issue eventually. Thanks to everyone who volunteered info, I learned quite a bit
james_s:
It doesn't seem like you're listening to what anyone is saying, you're just flailing around and then reporting that it doesn't work. This is a very, very simple circuit, if you wire it up exactly as shown it will work. If your power supply is not working properly it may have been damaged but do make sure you're using it correctly first. Slow down and read the manual, follow instructions, if you just blindly wire stuff up without understanding the most basic aspects you are not going to learn much.
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