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Looking for a pH-meter circuit example

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yagizcan

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Hello
I need ph-meter circuit.
But I don't find any circuit about this.
Please help
 

ph meter circuit [pdf]

i will atache one pdf file
 

phoper.html

ıf you can fınd the cırcuıt can you send me too.
I fınd two different circuits on this link
**broken link removed**


sedefcakmak@gmail.com
 

ph-meter circuit

seriously will those circuits found from the link will really work?
 

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