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False triggering of a 555 timer

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I could do this (see attached). But when the pump starts with the manual switch I think the current surge will affect the timer.
 
I could do this (see attached). But when the pump starts with the manual switch I think the current surge will affect the timer.
 

Attachments

  • elec schematic timer  filling-multi-contact-switch-1.jpg
    elec schematic timer filling-multi-contact-switch-1.jpg
    591.3 KB · Views: 148
Well, that made no sense. Too bad you can't delete a previuos thread.
 

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  • elec schematic timer  filling-multi-contact-switch-2.jpg
    elec schematic timer filling-multi-contact-switch-2.jpg
    590.3 KB · Views: 161
If more contacts could be added to the switch I could isolate the timer from the the voltage regulator. Or perhaps these contacts can be replaced by relays.
 

Attachments

  • elec schematic timer  filling-multi-contact-switch-3.jpg
    elec schematic timer filling-multi-contact-switch-3.jpg
    592.2 KB · Views: 125
I'm beginning to think I don't need all these contacts on the manual switch. If the MOSFET source is open then the timer cannot affect the pump motor even if it triggers.
 

Attachments

  • elec schematic timer  filling-multi-contact-switch-5.jpg
    elec schematic timer filling-multi-contact-switch-5.jpg
    590.2 KB · Views: 143
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