Okay, so I am fairly new to minecraft redstone [started 10 days ago] so please don't hate me if this has already been made but I couldn't find it so far.
It's basically how a real life landmine functions.. So when you step on a pressure plate nothing happens, but when you get off of it it sends a redstone signal here is a gif [I am sorry for low quality] :
Here is a very rough explanation:
So you basically send 2 redstone signals from the pressure plate one into the sticky piston (the piston is already extended because of the redstone torch so it retracts) and the other one straight to the TNT (or whatever you want) through the block that the piston is holding, but you delay the second signal for 4 ticks (the one that is passing through the pushed block), this way the piston retracts first and then the main signal turns on, and when you step off of the pressure plate the piston extends while the main signal is still on because of the delay and it goes through the block to the TNT(or whatever you want). I know it is not very complicated but it looks cool to me.
I am posting this here because its a cool way of making a mine in adventure maps but it could also be used in MANY more redstone builds (I hope to see some creative ways)
Nice job working out how to do that for yourself, all too many players seem to limit themselves to simply copying previous builds.
The following is spoilered because;
while working out your own solutions will take longer and be unlikely to result in circuits with the same polish as those evolved through several man-years of study you will likely learn more (in the sense of having a deeper understanding of how the circuits and compenents function) and may have more fun (assuming you prefer to discover for yourself).
I take an intermediate approach to the issue, studying existing circuits as I don't like "reinventing the wheel", but building variations in a test world to try to ensure I understand how they function – something that comes in handy in spotting why in blazes the thingy isn't working when built "for real"
The type of circuit you're using as a fuse is a falling edge detector (it emits a pulse on the falling edge of a signal i.e. when it turns off); more specifically a Moving Block Falling Edge Detector (there are other ways of acheiving this effect).
One of the difficulties with looking for redstone circuits is that the nomenclature is based on the circuit not the effect (in this case the falling edge detection not the mine fuse use) and the circuit names are often imported from electronics [which is great if you already have that background… not so much if you don't…] including preserving some of the idiosycracies of electronic jargon [eg. (Q,Q) for output and inverted output] and introducing a few of its own [minecrafts RS NOR latch is more commonly (but not universally) called an SR NOR latch].
You can probably save yourself a great many hours by looking through https://minecraft.gamepedia.com/Redstone_circuit and the related pages, but you will be better served long term if you actually build and adapt the circuits so as to understand them rather than the more common practice of simply copying them.
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WARNING: I have an extemely "grindy" playstyle; YMMV — if this doesn't seem fun to you, mine what you can from it & bin the rest.
Yeah yeah I assumed it was already made but I was proud of it because I basically made it up myself and didn't look online, but as I said I am new to this and I love it already because there are so many ways of doing things and people invent stuff everyday (Mumbo jumbo was my inspiration btw), I also played minecraft when I was younger but never looked so much into redstone since I couldn't understand it ... Thanks for the reply!