Minecraft Redstone
Minecraft Redstone Circuits: Repeater, Comparator & Logic
Repeaters vs comparators, clocks, pulse circuits, T-flip-flops and logic gates — the circuit building blocks behind every Minecraft farm, door and machine.
9/29/2026 26.3 / 26.52 Minecraft Wiki Team Last updated: 9/29/2026 3 min read
FAQ
What does a comparator do in Minecraft?
Three jobs: compare mode outputs the rear signal only if it beats the side input; subtract mode outputs rear minus side; and pointed at a container it outputs 0–15 based on how full it is — that's how item sorters and storage monitors work.
What is the simplest redstone clock?
Two repeaters facing each other in a 2×1 loop, or a comparator in subtract mode feeding its own side with dust. Hopper clocks (two hoppers passing items) give slow, stable timing for farms.
Do Java redstone tutorials work on Bedrock?
Not all of them — Bedrock lacks quasi-connectivity, observers pulse twice as long, and some update orders differ. If a build uses 'BUD powering' or 1-tick piston tricks, it usually needs a Bedrock-specific redesign.
Repeater vs comparator — what’s the difference?
- Repeater: boosts signal to 15, delays 1–4 ticks, one-way diode, and can be locked by powering its side — a locked repeater freezes its output state.
- Comparator: the engineer’s tool. Compare mode, subtract mode, and — pointed into a container — it measures fullness from 0–15. Chests, hoppers, furnaces, composters, jukeboxes, lecterns and more are all readable.
The core circuit set
| Circuit | What it does | How to build it |
|---|---|---|
| Clock | Repeats a pulse forever | Repeater loop, comparator self-loop, or two hoppers passing items |
| Monostable | Shrinks/lengthens a pulse to an exact length | Repeater + dust with a piston that cuts the line |
| T-flip-flop | Turns a button press into a toggle | Dropper-into-hopper loop, or a locked-repeater latch |
| RS-NOR latch | Two-input memory (set/reset) | Two torches cross-wired on blocks |
| Pulse extender | Keeps output on after input ends | Repeater chain or comparator fade |
Logic gates, in blocks
- NOT — a redstone torch: on when its block is unpowered
- AND — two inputs must both power a block before its torch turns off
- OR — any input powering shared dust
- XOR — two comparators, or a classic torch-tower, output only when inputs differ
Which components power the modern builds?
- Observer — watches a block face and pulses on any update: crop growth, furnace state, block placement. The backbone of auto-farms and flying machines
- Sculk sensor / calibrated sculk sensor — wireless redstone: triggers on vibrations, no dust required
- Crafter — auto-crafts on a pulse, the headline redstone block since Tricky Trials
- Copper bulb — a light that toggles per pulse (built-in T-flip-flop)
- Hopper — both a mechanism (locks when powered) and a clock engine
Java vs Bedrock — read this before copying a build
Java has quasi-connectivity, 1-tick observer pulses, and piston update tricks Bedrock doesn’t share. Bedrock redstone is simpler in some ways — pistons can’t be BUD-powered — but droppers/dispensers and many farm designs behave identically. When in doubt, build it in a creative test world first.
What to read next
- Redstone Basics — power levels, ticks, quasi-connectivity
- Easy Redstone Builds — apply these circuits to real machines
- All Commands — /fill and /clone speed up testing
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