Electronics > Beginners
Odd Glitch In Waveform
codingwithethanol:
I made this circuit to experiment with amplifiers, then I tested it with my function generator to see if I could use it as a mic amplifier and I see this weird glitch in the output. Not sure if that's normal or if I messed something up. My boards pretty messy so I also drew a diagram in MSPaint cause I suck at SPICE. Also excuse the mess on the desk, I don't have that much space so it gets cluttered quick.
Nerull:
Looks like clipping and crossover distortion. Clipping is caused by not having enough headroom in your supply rails.
741 opamps are old and pretty garbage and prone to crossover distortion.
You can try a load resistor between the output and the negative supply rail.
https://youtu.be/VgodYtiD_F0
codingwithethanol:
@Nerull Yeah I understand it clipping cause i was playing with the power supply and noticed that I was changing where it flattened out, but idk what crossover distortion is so i'm gonna google it. I have a few other opamp types so i'm gonna try them out.
Edit: Thanks for the link I love this guy! Alot of the stuff he does kinda goes over my head but ill take a look at this one
Edit: https://youtu.be/VgodYtiD_F0?t=552 Ok this seems pretty much like black magic but ill try it out
magic:
Check what's your virtual ground voltage and how it varies in time. 1MΩ seems rather high for rail splitting.
I don't know about µA741 crossover distortion, I thought it wasn't supposed to be that bad. But if you bought these chips from an auction site, chances are good that they are LM358 with fake markings.
rstofer:
--- Quote from: magic on February 10, 2020, 10:36:06 am ---Check what's your virtual ground voltage and how it varies in time. 1MΩ seems rather high for rail splitting.
I don't know about µA741 crossover distortion, I thought it wasn't supposed to be that bad. But if you bought these chips from an auction site, chances are good that they are LM358 with fake markings.
--- End quote ---
Lower those 1M resistors to 1K and see what happens.
Considering their use in aged Analog Computers, the crossover distortion of 741 Op Amps can be managed. These old computers use +-15V supplies with +-10V signal swings and I have never seen clipping or crossover distortion.
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