Hey everyone, I origionally posted this in the vita subforums, but figures I would post it here as it will work on all versions of MC.
Basicly, I had a version I came up with a while back that I was rather satisfied with, but the water was controlled by a redstone torch, which had a annoying delay causing it to generate a water blade (quite common apparently), my friend put me to the challange & said he was going to attempt to compact it & redo it, i wanted to do it first ofc, and this is what i came up with, i know about the method of lighting a portal attached to it but the water method always seemed cleanest to me,
i used minimal redstone dust for this & its as fast as possible considering the space used & resources, & i had the intentions of making it as survival friendly as possible (no hoppers, no comparitors, etc), & attempted to make it as modular & less of a mess as possible.
the result: ~5tick on, ~3tick off, & water is activated for one tick, causing 0 water movement o.O
Entire dimensions of the finished product (including portal): 6x7x6 (w/h/d), mechanics only: 6x5x5.
if building in survival, the initial circuit (picture 1) starts 1 block below the base of your portal, that dispenser needs a stone block in front, & will be the bottom right corner in the portal.
this design is modular! if the power module (standard repeater t-flip-flop) is insufficient, change it o.O, remember, a comparitor can be used in the same way here, if using a compariter switch the middle piece of dust in pic1, with a repeater, which would allow you to replace that corner piece of dust with a block, saving one piece of dust.
i left the right side of the build clean (mirror it if you like), to allow a hopper feed for easy filling if required.
This build requires (not including portal):
9 redstone dust (not including torches dispensers piston & repeaters, which is 32 btw).
2 redstone torches
2 dispensers (NOT droppers)
1 sticky piston (simple monostable)
1 1/2 slab of choice (IMPORTANT, but not visible when done)
5 stone (smoothstone, for the back wall of the portal, or any block capable of igniting the portal via a fire charge)
27 blocks of choice
the platform in the screenshots is 6x7x6, and is built off of, the floor is effectively one layer below the build.
items in hotbar list required items & quantities for that module
Modules are color coded, pay attention to block coloring:
Green = fire charge dispenser circuit, lower most segment of the build, hidden completely in the design
Red = water dispenser circuit, abit more to it, designed to take into account a dispenser waiting 2 ticks to fire an item, similar to a 4-tick clock but with a monostable in the back corner, leading into the 2 corner repeaters instead of just 1, a single-tick pulse is fired, with another 2 ticks behind
yellow = power circuit, standard repeater t-flip-flop using locked repeaters, silent and rather quick.
white = neutral, either super important, or means nothing, tbd
Breakdown on the screenshots o.O:
1.) Fire charge module, can be filled once the torch below is placed.
2.) Water dispenser module 1of2, notice the upward facing sticky piston in the back corner, this piston would be floating on the second piece of dust in on picture #1, middle dust on the long arm.
3.) Water dispenser module 2of2, notice repeater direction, 1-tick (default) on all.
4.) water & fire charge circuits attached, main input must be a high powered block next to the piston in #2/3 with dust on top.
5.) first level of input t-flip-flop done, & is exactly as shown, right-most repeater is 3-ticks, rest are 1-tick (default).