Re: power on delay using a 555 chip


kfel wrote:
Chris,

The interesting part is that when i connected the output of the power
supply (using microchip's design) via a 3K9/2W resistor to the gate of
the triac (bypassing the 555 altogether) it worked perfectly. Is it
that i should have connected some resistance in series (say 820ohms)
with the output from the 555 before applying it to the triac?

No, sorry, Kfel. I guess I wasn't being clear.

You *SHOULD NOT* use the transformerless power supply shown in the
Microchip appnote. I'm not giving advice on what is a ultra-cheap,
lazy and potentially hazardous way to power a circuit.

I'm not saying it's not done. But for a newbie (note your first
question), this type of power is too dangerous. If you want to talk
about any other option, go ahead. But I can't help you here.

If you want to talk about turning on line voltage stufff, get a wall
wart first so you have an isolated power supply. But I'm not going to
give advice on something that could potentially cause you injury.
Believe me, nothing personal at all. Just safety first here. Sorry.

Good luck
Chris

.

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