Electronics > Beginners
TL081 weird glitch
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magic:
It wasn't my post. But a few kΩ resistor to either rail should eliminate this distortion if there is nothing more connected to the output.

Okay, gain 2 so you have some gain resistors. Try unity gain or higher value gain resistors or lower value resistor to the rail, up to the point of cooking that resistor ;)
sheisthedarkness:

--- Quote from: magic on November 14, 2019, 05:45:08 pm --- Try unity gain or higher value gain resistors or lower value resistor to the rail, up to the point of cooking that resistor ;)

--- End quote ---
Hey, that worked ! 1k resistor from out to vcc eliminated the distortion, although I still don't really get why. Thanks !
mikerj:

--- Quote from: sheisthedarkness on November 14, 2019, 05:51:35 pm ---
--- Quote from: magic on November 14, 2019, 05:45:08 pm --- Try unity gain or higher value gain resistors or lower value resistor to the rail, up to the point of cooking that resistor ;)

--- End quote ---
Hey, that worked ! 1k resistor from out to vcc eliminated the distortion, although I still don't really get why. Thanks !

--- End quote ---

It's because you are forcing the output stage to work in class A operation, i.e. only one of the output transistors is ever conducting.  This means you can only drive higher impedance loads however, once you load the output enough that the 1k resistor can't provide sufficient current the crossover distortion will be back.
T3sl4co1l:

--- Quote from: sheisthedarkness on November 14, 2019, 04:43:50 pm ---Oh, well that's unfortunate. I didn't think something like that would be worth faking.

--- End quote ---

:-DD Rule 34 of electronics sourcing: if it exists, there's counterfeit of it!

If it came from eBay, Ali or other unofficial source, assume it is counterfeit.  Or salvaged.  Doesn't matter what.

And agree, looks like LM358 crossover distortion.  Could be something even worse than that (a Chinese copy?), but not much worse without simply not working at all.

Tim
RoGeorge:
See if this remedy works

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