+3 v reference METHOD

[myfaithnka]

Hi all,


is there any cheap way to a 3 v reference to power an lm358,opamp.

Thank you.

 

[Tahmid]

You can use a pot off the LM358 power supply and adjust it to give 3V output. Of course, the power supply must be regulated then.

You can also use a cheap TL431 along with 1 resistor and 1 variable resistor.

https://www.onsemi.com/pub_link/Collateral/TL431-D.PDF

Look at Figure 2 on page 5 in the above link (datasheet).

Hope this helps.
Tahmid.

 

[myfaithnka]

Hi tahmid,
i am using this method from a battery which will discharge towards 4v from 6v.is it ok to use tl431 here this case. I am doing an low voltage cut off ckt.

Thanks