This is possible to do. But why would you want to do this for a toaster? A toaster already has a builtin timer of some kind. The toast pops up when it is done.

My toaster is beyond repair .The timer circuit in the photo above in the first post is not the answer, because when the toaster switch is connected, according to the above circuit, the electricity always reaches the LED circuit, and it makes the LED stay on forever regardless of the charge or discharge of the capacitor. Do not turn off the LED lamp

 

The momentary button circuit in the OP does exactly what you would want if you replace the LED with a relay to operate the toaster.

You push the button once and it toasts for some minutes. Why do you want to change the type of switch to one that will not work with that circuit?

 

The momentary button circuit in the OP does exactly what you would want if you replace the LED with a relay to operate the toaster.

You push the button once and it toasts for some minutes. Why do you want to change the type of switch to one that will not work?

Because the toaster is plugged in, a 12-volt power supply is permanently connected to the timer circuit, and it does not use a momentary micro switch. Inside it is a magnet that keeps the key down, and when the key is down, a 12-volt electric current reaches the timer circuit permanently
If I want to use the circuit in the first figure to do this in the toaster, it will cause the magnet of the toaster to hold the key down, but the device will not turn off, because a 12-volt power is constantly in the timing circuit. and this makes the device stay on forever.
Please send me one simple circuit to do this.

 

A follow on from post #13. What would you need to do to the circuit so that the capacititor CHARGES slowly ? As the circuit is in post #1 it charges almost instantly.

Les.