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[SOLVED] Offset null circuit question

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obrien135

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Is an offset null circuit required with every circuit you build with an LM741 op amp?
 

Hi Obrien,

it is important when DC shifts and/or DC gains are of concern (e.g. instrumentation amplifiers).
Otherwise (like in passband filters) that can be left without use.
Regards

Z
 
offset null circuit nullify the DC which is present at the output of opamp, when we apply the common voltage at the terminals of opamp. if your measurement is sensitive and can be affected by that DC value then you should use offset null circuit.
 
Usually most of the amplifiers have DC offsets. but if you need amplifiers where you can adjust the offset , then better choice is to go for amplifiers with JFET structure like TL084. they give you option of nullifying offset
 
op amp can be used for various circuit.the null circuit used is depends upon your circuit necessaries.for example if you want to build a comparator which compares the voltage in the input pins then the op amp gives only two saturation levels,so you dont need to set the offset voltage.so you can simply ignore this feature in the above circuit.
in cases such as amplifier circuits say you want to scale up the input voltage linearly to output voltage you dont want that unnecessary offset voltage,in this case you have to add the offset null circuit..........
if there is any other qns you can ask me...........
 
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