NOT gate

The NOT gate is a redstone circuit added by RedLogic. It is a logic gate for complex redstone circuits. It emits a redstone signal, if no signal reaches the gate (see Usage).

The circuit would be possible with Vanilla redstone mechanics, but this block reduces the size of the circuit to 1 block. This makes complex circuits clearer and easier to control. In electronics, this gate enables the physical execution of the boolean function "NOT" (logical negation / inverter).

Usage
The NOT gate has one input side and three output sides for redstone devices.

If there is no redstone signal on the input side, then a redstone signal is emitted on all three output sides. If a signal reaches the input, then no signal is transmitted through the output sides. Due to this property, the gate is called an inverter ("a signal causes no signal," respectively "no signal causes a signal").

Using the Screwdriver from RedLogic, the orientation of the gate can be changed freely in all four directions. Furthermore, using the screwdriver in crouching, the output sides can be turned off and on again in various combinations.