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I have this simple circuit (existing, not mine) that you toggle on and off with a simple push button and when you power it off and back on it stays off unless the button is pressed. I want to set this device on a timer but in doing so it never comes back on once the power has been cut. Is there a way to easily change the push button to a switch instead so if the power is killed it comes back on? Maybe another way to accomplish the same end goal?

I can't just hardwire the power as it's powering a PWM pump so I need to power up the circuit.

It's a kids toy, basically a little garden and the power turns on the light/pump.

enter image description here

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  • \$\begingroup\$ What does your circuit look like? \$\endgroup\$ – Voltage Spike Jan 21 at 16:30
  • \$\begingroup\$ what happens if you power it up with the power button permanently held down? \$\endgroup\$ – james Jan 21 at 17:56
  • \$\begingroup\$ If i power it up with the button pressed it starts up off but turns on when I release it. \$\endgroup\$ – Ryan Detzel Jan 21 at 18:21
  • \$\begingroup\$ I'm a little confused. Are there two switches? One for power on/off (main supply enabled or disabled) and a momentary that's needed to be used once the main supply has been turned on? In short, are there TWO switches involved here? Or just one used in a way I still don't understand? \$\endgroup\$ – jonk Jan 21 at 19:29
  • \$\begingroup\$ Just one, push on/off. I unplugged it to simulate if I put a timer on inline with the power. \$\endgroup\$ – Ryan Detzel Jan 21 at 19:48

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