I was trying to make a door using the new Target blocks and noted that when I made either a pulse extender or a pulse repeater of any type, the repeaters used would stay powered indefinitely. The repeaters function as intended when not used in either of the two above mentioned circuits.
MC-175283
Pulse Extender keeps Repeater Powered
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The circuit shown in the image is not a pulse extender or pulse repeater and will instead stay powered if it ever becomes powered.
For a pulse extender, you need two repeaters (or lines of them) facing in the same direction, set to different delays.
A pulse extender will increase the number of pulses if the pulses are shorter than the difference between the repeaters.
For a redstone clock (which, once powered, repeatedly turns the output on and off), you need two repeaters facing in opposite directions, and the input must be much shorter than the total delay of all repeaters. for the circuit to work. A button press is too long for a redstone clock with 2 repeaters, but placing a redstone torch on a redstone block will give a short enough pulse to start the clock.