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Simple 12v delay circuit?
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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