TL072 Question

[jdduffield]

Something I’m confused about with the TL072 is all the different versions. (TL072CP, TL072BCP, TL072ACP) What are the differences?

 

[Brett]

It has to do with temperature operating range/package type, etc., all of which is described in the datasheet's addendum:

https://www.ti.com/lit/ds/symlink/tl072.pdf

 

[jdduffield]

It has to do with temperature operating range/package type, etc., all of which is described in the datasheet's addendum:

https://www.ti.com/lit/ds/symlink/tl072.pdf

In a guitar pedal circuit that calls for a TL702, do you happen to know if they are interchangeable? And if so, does the sound get altered drastically or only slightly?

 

[Nostradoomus]

yes they are interchangeable, there should be no sound difference. If there is a difference you probably have bogus chips.

 

[lowpitch]

Is there any scenario where the different offset voltage between a, b and c might affect noise levels or sound or can this be completely disregarded for pedal circuits?

 

[Nostradoomus]

Is there any scenario where the different offset voltage between a, b and c might affect noise levels or sound or can this be completely disregarded for pedal circuits?

Good question! Chuck already laid it out much better than I can haha. This whole series is worth a read.

Thread 'Opamps for Dummies - part 3'

Oct 17, 2023

In this chapter, we'll discuss the input characteristics of opamps and how to bias them.

In an ideal opamp,
1. The current flowing in or out of the input pins would be zero.
2. The voltage difference between the input pins would be zero when the opamp's output is halfway between the rails.
3. The opamp would work correctly even if the inputs are at either of the rails.

With #1 we can get pretty damn close to zero if we use a JFET or MOSFET input opamp. TL072 and CA3130 are examples. While very low input current is not always mandatory, it does make biasing easier. Current flowing in...

• Chuck D. Bones
• Replies: 7
• Forum: Chucks Boneyard

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