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Simple 12v delay circuit?

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bkenobi:

This might be useful.  I've wondered how to set the delay on a 555 before but never checked.  This is a calculator.

http://clarkson-uk.com/555-timer/operation/frames3.html

It looks like a set capacitor value with a rheostat would provide a variable delay.  Find an appropriate sized capacitor for the rheostat you want to use and you're good to go, right?

BadMouth:

http://www.crutchfield.com/S-nH1bbdA6HFz/tech/kb327.html

boardjunkie:


--- Quote from: bkenobi on July 05, 2011, 06:35:13 pm ---This might be useful.  I've wondered how to set the delay on a 555 before but never checked.  This is a calculator.

http://clarkson-uk.com/555-timer/operation/frames3.html

It looks like a set capacitor value with a rheostat would provide a variable delay.  Find an appropriate sized capacitor for the rheostat you want to use and you're good to go, right?

--- End quote ---


10k resistor with a 470u cap gives a time of 5.1 secs.

Gray_Area:

What are the details of the application?

jimmy2x2x:


--- Quote from: Gray_Area on July 10, 2011, 07:10:45 pm ---What are the details of the application?

--- End quote ---

Postpone power switching to TV, so I can apply power to all devices at once, postpone switching for a couple of seconds, then apply power to select correct scart channel.

Looks like there are some great solutions here, I have not had chance to experiment yet.


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