lm741 op amp

Dave Hughes97

Prodigy 20 points

Other Parts Discussed in Thread: LM741

hI, I hav'nt played with self buil;d electronics for a number of years and hav recently started again.

My Question is, "am i able to supply pins 4 & 7 straight from a bride rectifier or does if have to be a - voltage?

over 10 years ago

0 Thomas Kuehl over 10 years ago

TI__Guru* 93105 points

Hi Dave,

Operational amplifier such as the LM741 were most often applied using dual, plus/minus supplies. Their common-mode input voltage range and output voltage range are best utilized with dual supplies. They can be used with a single supply, but then their common-mode input and output voltage ranges need to be referenced to about half the applied supply voltage. Doing this often requires a reference voltage be established at level, or close to it.

Take a look at this information from TI's Op Amps for Everyone book. It shows some comparisons between the dual, and single-supply implementations of common op amp circuits:

http://www.ti.com/lit/ml/sloa091/sloa091.pdf

Regards, Thomas

PA - Linear Applications Engineering

0 Dave Hughes97 over 10 years ago in reply to Thomas Kuehl

Prodigy 20 points

thanks for that Thomas. It's going to be used as. 50Hz band pass filter, what would you recommend? Some circuit diagrams would be very helpful. Regards Dave h

0 Thomas Kuehl over 10 years ago in reply to Dave Hughes97

TI__Guru* 93105 points

Hi Dave,

I suggest you take a look at TI's Webench Filter Designer tool. You coud use it to help you synthesize a 50 Hz band-pass filter. There is some tutorial information on the web page that should help get you started:

http://www.ti.com/lsds/ti/analog/webench/webench-filters.page

Regards, Thomas

PA - Linear Applications Engineering

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lm741 op amp