Karl Lattimer wrote:
One question about the below circuit, how does the slow charge of the cap happen, the orignal point of putting the resistor before the cap was to have a slow increase and a slow decrease through the LED draining the power.
if the cap has no resistance then won't it reach almost full charge of the cap instantly?
Atleast thats what i think i was taught in college?
Karl,
Chris Ellis wrote:
Karl Lattimer wrote:
After sitting, almost transfixed on my mac's sleep light as it slowly risesSorry for the reply again but i have a better circuit. This provides a slow fade of the led during the off period of the hdd light The large C the slower the fade i recomend between 220 - 2200 uF the circuit is attached
and falls a little college electronics returned to me.
^^ HD LED |---|>|----+ HD+ o--[ R ]--+ c |-----+ |---|(-----+ | HD- o--------------------------+
Now I'm pretty sure this is right, off the top of my head, and would relieve
the headache a hard disk light in a freevo can cause.
The only problem is I can't rightly remember the method of determining the
values of R and c (my notes are long gone), I'll keep looking, and update as
necessary and of course post a wiki. The thing is, what would be a good
timing? Should we try and time it so our breathing comes in time with it as
we watch a movie?
Regards Karl,
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circuit
this works by when the hdd led is high (5v) then the capacitor charges. and aslo suplys the led. when the hdd led is off the capacitor discharges through the resistor and led.the 5v supply in the circuit is the hdd con on the mobo
please note that with either circuit you could not get the led to flash and fade at a sett rate ie breathing
Chris Ellis
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This is difffernet to your orginal circuit. the orginal was a RC filter that just lengthened the pluse fro mthe hdd led as essential it is a square wave. i built it a tested it but found that it faded on but not off (recall from meory of yesterday lol) so i bult the other circuit that when the hdd light is on charges up the capacitor which then slowly discharges through the led when the hdd led is off. Either circuit would work it just depends on how you want the led to fade / flash. I did in a post post RC values for the orginal circuit i believe it was r= 680 ohms c= 220uf remebem that r can not be to large as it will dim the led. just remeber that the timer preriod RC needs to be much greater the the Time period of the effective square wave on the HDD led pin which for mine was arounf 0.5 second when in use play music etc. but it you T is say 1S then you will need C =4700uf. My other circuit did not use such a large capacitor which was one of the main reasons i though it was better as capcitor over 1000uf can be arounf 15mm - 25mm diameter
Chris Ellis
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