Quote Originally Posted by Darrel Taylor View Post
The LM324 can only reach VDD -1.5V. So with 5V powering it, the most you can get out is around 3.5V.

If you power it with 7.5 V or more, it'll give you the full range.
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Thanks Darrel. You are so correctly! i have just experimented that and it worked!

Thanks again.

Sylvio