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Registered Member #111
Joined: Fri Feb 10 2006, 01:04AM
Location: Menasha,Wisconsin
Posts: 65
i am trying to build a pc case with power switches that work like touch lamps. this is difficult because vital components need to be on when the computer is and i wish to have 3 switches. with different functions
one for main power: i want this to have no delay when turning on the system, but a 3 second delay before the power is switched
one for the fans: i want a three second turn-on/off
and finally one for the lights: i want to "voob" them on an easy thing to do with a LM324 ic but i want them to stay on after the current is high. then turn off the same way.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
to make a delay you just use a 555. You hook the reset up to the switch, and wire it as monostable. Since it triggers on falling edge, you need to use a pullup on the switch.
I supposse you could create the 'voob' by taking putting a mosfet across the cap in the 555, and driving the led off that... You could use a resistave divider (using like 1M of resistance) to get the right fading effect...
Is there anything the 555 can't do
Or an even easier route would to get mikrobasic (or whatever) and burn a pic12f675 to do it...
Registered Member #111
Joined: Fri Feb 10 2006, 01:04AM
Location: Menasha,Wisconsin
Posts: 65
well that would be way too technical. especially I'm mostly asking for help from engineers when I'm a novice. i really don't feel like being swamped in the engineer dialect.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
What you are asking for is commonly known as power sequencing. You might have some luck finding a dedicated sequencing chip that has programmable delays (either digital or via RC) that you may use. Also, a microcontroller is a perfect solution for what you are asking, such as a PIC.
Registered Member #111
Joined: Fri Feb 10 2006, 01:04AM
Location: Menasha,Wisconsin
Posts: 65
while the fade on would be nice, it is not nessicary.
for this i must use a momentary switch (qprox qt110) so is there anyway i could make the momentary into a permenantly on switch until i tap it off again?
pic (from when i was going to buy one) are really expensive and i would need a programming kit. i dont feel like spending 100+ dollars for a light switch.
Registered Member #111
Joined: Fri Feb 10 2006, 01:04AM
Location: Menasha,Wisconsin
Posts: 65
Conundrum: thank you for your help! the delay would work by using a resistor to bleed into the capacitor.filling it until it reaches a high enough voltage to trigger the transistor.
am i correct?
anders: sorry, i got the value (cost) from an old magazine that sold it as a kit. the price was 129.00$ everything pre-made.
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help with electronic delay
