MOSFET Timer with Relay

Quite nice. If you highlight the Mosfet gate for the oscilloscope then we can see the discharge with the Mosfet switching off as it drops below your 1V gate threshold setting.(more easily seen if the scope is set to 500ms)

Like this?

Super good nice circuit....

Yes, good. Viewers can highlight one thing at a time to see what is happening in each part. You might want to try altering the Mosfet settings e.g. VTO to 3v and put the pull down resistor to 1M ohm with a cap of 20uF to see different scope actions etc.

Okay, I tried it. The higher VTO reduced the timer duration (of course); but I didn't notice much difference with those resistor & capacitor values.

Am I missing something? I'm still pretty new to this.

I would also appreciate comments on this similar/related circuit; if you have time: http://everycircuit.com/circuit/4524764262825984

My suggestion of 20uF was basically to show that you could use a different resistor (1M) and cap combination to achieve roughly the same timing. Keeping that 1M and now dropping the cap down to say 1uF should show a variation. Apart from those rc timings, I would now suggest fixing your Nmos settings for maximum throughput.....I always do that with mine whenever possible here on EC.....it makes using them very consistent (they can always be altered later for any specific purpose if required). ie W fully clockwise, L fully anti-clockise, KP fully clockwise and VTO at 3v .... Those settings combination will keep your traces as sharp as possible with consistency....see how the Mosfet bar then goes sharply in and out and see your green trace move sharply.....it is now the required rc doing the required timings, not the poorly configured Mosfet, which is really just meant to do the efficient switching.

Oh, okay. I just used the default NMOS values. I don't fully understand how they work yet. And I'm not really sure what kind of values are typically available in reality. But I will look into it. Anyway, you mentioned RC a few times now. What is RC?

 When you put a voltage across a Resistor and Cap in series, the cap charges up through the resistor...that is the RC, and the time it takes to charge is related to their values multiplied together. You can look in to that in more detail later if you wish, but keep the fun ahead of getting bogged down, there is enough detail to refer to here for quite a while  http://everycircuit.com/circuit/6272290221457408