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Electronics => Beginners => Topic started by: anishkgt on September 28, 2017, 11:34:05 pm

Title: Opamp adjustable gain
Post by: anishkgt on September 28, 2017, 11:34:05 pm

I wish to have a variable gain to pin 5 for the schematic . With a constant gain it would be a resistor between pin 5 and R4. Would R23 a give a variable gain. Is the schematic correct ?

Title: Re: Opamp adjustable gain
Post by: Zero999 on September 29, 2017, 12:02:31 pm

Yes, that will give a variable gain, but keep the leads to the potentiometer as short as possible.

Could you have make the schematic any more difficult to read? Please use proper op-amp symbols. It makes the circuit much easier to understand.

Title: Re: Opamp adjustable gain
Post by: anishkgt on September 29, 2017, 12:05:31 pm

Thanks hero.

It does confuse me as well. Got the symbol from Digi-Key with the product.

Quick question,
Are all opamp symbol and pin the same ? I guess not, does everyone create their on when working different opamp ?


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Title: Re: Opamp adjustable gain
Post by: Zero999 on September 29, 2017, 12:10:52 pm

Op-amp symbols are generally the same and there's a standard pin-out for single, dual and quad op-amp ICs, which is followed by most manufacturers, but always check the data sheet to be sure.