Looking for LM358 replacement

bandi94 · Jul 20, 2015

Hello. I want to make this volt-amp metre https://320volt.com/wp-content/uploads/2010/08/volt-amper-metre-devresi-lcd-voltaj-akim-olcumu-pbp.png

It is using LM358, i dont have LM358 but i have TLC271(CP) i check'd the datasheet and i think it will work, and instead of 8V can i supply the TLC271 with only 5V ?

Thx.

esp1 · Jul 20, 2015

hi,
A problem could be the output high limit using a 5V supply, it is approx 3.8V max.
E

D.A.(Tony)Stewart · Jul 20, 2015

TL271 works well on outputs and inputs to ground but at much lower load currents, so raise all R loads x10. At 5V the output impedance is around 2.5K according to Fig 8.

bandi94 · Jul 20, 2015

Thx. Well if i power the op-amp at 5V i will get a max of 3.8V as @esp1 said. I was thinking that the whole circuit will power itself from the input that will be measured ( i need it to check the charging process of 12V batteries ) so how the circuit will have a max of 30V input if i buy an lm358 ( the datasheet says that can be powered up to 32V ) can i directly connect it to the input ? ( how the max input is 30V it will never exceed the 32V max)so i don't need to put an extra 8V regulator only for the op-amp.

Looking for LM358 replacement

bandi94

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esp1

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D.A.(Tony)Stewart

Advanced Member level 7

bandi94

Newbie level 2

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Looking for LM358 replacement

bandi94

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esp1

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D.A.(Tony)Stewart

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