Circuit Project Electronic

Circuit : Miroslav Adzic - Serbia & Montenegro

Description:
A 555 pulse generator circuit with a difference, the initial pulse is tailored by additional circuitry to match the duration of subsequent pulses.

single pulse gen

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Notes:
The NE555 and the First Pulse

The first positive pulse from a classic 555-based oscillator is always 1.6 times longer than the following pulses. The difference is caused by the fact that only during the first cycle C2 starts charging up from 0 V. This is generally not a problem, but sometimes this first pulse just should be the same length as the rest - at least approximately.

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