Hi there

I would like to use the reset circuit you see in the attachment in a system that can reset the whole system by disconnecting the +12V from the InputVoltage for two seconds and then connecting the +12V to the InputVoltage again. InputVoltage supplies the system and +12V supplies only the reset circuit. The reset signal (when it is high) comes from the system itself.

I have this design but for some reason it woks for some boards and not to all boards, Do you think it is a problem in the design?


Regards,

Omar

 

Did you really leave pin 4 and 5 unconnected?

 

hi,
It not a good idea to leave pin #4 Reset pin, floating, connect it to +V
E

 

When I designed, I was assuming pin 4 has an internal pull up resistor. I checked it now, it does not?! I think I need to connect it to +V. Thanks a lot for the help.

Is there anything you think it makes does not work all the time?

 

hi,
Have you also considered Mike's point about pin #5 floating.?
E

 

Thank you so much guys for your help, I think I will redesign it, high in pin 4 and a small capacitor to ground in pin 5.

I am sure this will help thank you so much guys for the amazing support.