Hi,
You have started another thread, did my observation fix your problem.
It is courteous to post a solution to the problem posed in the thread.
Tom.. 
Sorry for not replying.
After the mcp get damged , i searched on internet and i've read that i shouldn't share the ground of the circuit so i sperate it and tried the circuit with power supply and it didn't work as it should,random values get in the output.
I've built my circuit again and iwill try my new and last mcp with 9 volt battery , but when i gurentee that my full idea is okay so that's why i've started a new thread.
In your opinion can i use an optocoupler to make sure 100% there is no current will back and damage my mcp. The question is can i use optocoupler to get of it's output differnt voltages ?
If the black wire is ground and the red wire is +19V then it looks like you have the power connections to the LM324 backwards.
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