Electronics > Beginners
LM741 connections with signal generator
Zero999:
--- Quote from: Gazmon on March 24, 2019, 06:33:29 pm ---Can I substitute the LM741 for an LM358
--- End quote ---
Yes and no. If you've already designed the PCB, then no, because the LM358 has a totally different pin-out and it's a dual, rather than single op-amp.
If you're just breadboarding or are designing a new PCB, then yes. The only thing you need to be aware of is the LM358 has a class B output stage, which can cause cross-over distortion and is more evident at higher frequencies and gains. This can be eliminated by adding a resistor from the output to the negative power rail, to ensure only one output transistor is conducting, thereby causing it to operate in class A.
https://electronics.stackexchange.com/questions/341843/adding-a-resistor-to-reduce-crossover-distortion-in-an-lm324-lm358
Neither the LM741 nor LM358 are great for frequencies above the the mid-audio band. The TL072 and NE5532 are common, faster op-amps which are much better and commonly available. Try a range of different op-amps and note what happens, as the frequency is increased.
Gazmon:
Cheers
All Excellent info
Gazmon:
Can I use 2 x 9v battery’s connected togeather to get a positive/negative voltage of 18v to power the LM741?
Will 18v be ok ?
basinstreetdesign:
--- Quote from: Gazmon on March 26, 2019, 07:09:35 pm ---Can I use 2 x 9v battery’s connected togeather to get a positive/negative voltage of 18v to power the LM741?
Will 18v be ok ?
--- End quote ---
741's are supposed to be good to run on +/- 22V or up to 44V total between the V+ and V- power pins, however you split the supplies.
So using two 9V batteries for each of V+ and V- is fine. This allows for higher amplitude signals through the op-amp, up to about 30V P-P at output.
Also OK to use two 9V batteries to get +/- 9V and this allows signals of about 14V P-P.
Zero999:
--- Quote from: Gazmon on March 26, 2019, 07:09:35 pm ---Can I use 2 x 9v battery’s connected togeather to get a positive/negative voltage of 18v to power the LM741?
Will 18v be ok ?
--- End quote ---
Yes.
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