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how to make an RC delay to led (not flashing) ? Answered

how to make an RC delay to led (not flashing) ?
i have 3 leds and i want them to light up in sequence once they are powered and they keep lighting without flashing
for example
second 0 > 1 0 0
second 1 > 1 1 0
second 2 > 1 1 1

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steveastroukBest Answer (author)2011-07-10

The best way would be to use Schmitt triggers and RC delays like this.

This has the advantage of being expandable ad nauseum.

Steve

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aessam1 (author)steveastrouk2011-07-11

i know that it's possible and easy using ICs
and i know how to do it using 555
but the idea is that i want to make it as simple as i can
and I'm not looking for long periods
the idea is that i have 3 (7colors flashing leds)
and if i switched them in the same time the flash the same colors
so i want to make a small delay between every one so that they flash different colors
and it's going to be in very small place so i want to use the least components as possible
i think maybe an RC and transistor could do it
if it's not possible without the use of ICs tell me
and thanks for your reply

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steveastrouk (author)aessam12011-07-11

My circuit gives clean switching "on and off", using a transistor will give you very soft starting and poor response.

Steve

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