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I want to add more time to this relay delay

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Shaydzmi:
The maximum is 3 seconds, I want it to be 5 minutes or even 10 minutes if possible.
What should I do in terms of changing capacitors or resistors etc?
Thamk you.
This is the circuit:
http://tinyurl.com/yb4xq2ky

Photos:



m3vuv:
whats it for?,if it was me i would build a new pcb with a 555.

Shaydzmi:

--- Quote ---whats it for?,if it was me i would build a new pcb with a 555.
--- End quote ---
thank you,,
I have a lot of them in hand, and I don't have the resources and knowledge to build new ones.

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