Search found 9 matches

by madscientist
Thu Feb 10, 2005 6:12 am
Forum: General Discussion
Topic: LED lighthouse
Replies: 31
Views: 7244

Re: LED lighthouse

need to power up 3 leds at 3.5v each. The leds need to be operating only in the dark. There are 2 sets of leds, they have to alternately switch on and off while operating (dimming in, holding and dimming out; one set on, the other off). There wont be AC source, so I have to use solar power to charge...
by madscientist
Wed Feb 09, 2005 8:53 am
Forum: General Discussion
Topic: LED lighthouse
Replies: 31
Views: 7244

Re: LED lighthouse

Edd Whatley,<p>I do need 2 sets of leds to light alternatingly*.<p>* - if there's such a word.<p> :)
by madscientist
Wed Feb 09, 2005 5:09 am
Forum: General Discussion
Topic: LED lighthouse
Replies: 31
Views: 7244

Re: LED lighthouse

precisely that's the point, i need help on the circuit design. pic solution is way out for me. ne5u, can u piece out a circuit diagram for me? cos i m quite confused about wat u r toking abt, :)
by madscientist
Mon Feb 07, 2005 9:33 pm
Forum: General Discussion
Topic: LED lighthouse
Replies: 31
Views: 7244

Re: LED lighthouse

haha, i dun tink this circuit uses so much power to warrent such calculations, :) hehe, so anyone can help me design that type of circuit?
by madscientist
Sun Feb 06, 2005 9:41 am
Forum: General Discussion
Topic: LED lighthouse
Replies: 31
Views: 7244

Re: LED lighthouse

NE5U,
it's tropical. I m pretty sure sunlight's aplenty all year round, :) Gee, I badly need a complete working circuit diagram now.
by madscientist
Sun Feb 06, 2005 6:52 am
Forum: General Discussion
Topic: LED lighthouse
Replies: 31
Views: 7244

Re: LED lighthouse

Chinese new year. So I have to settle this real quick! Oh gosh, today's the last day!
by madscientist
Sun Feb 06, 2005 3:59 am
Forum: General Discussion
Topic: LED lighthouse
Replies: 31
Views: 7244

Re: LED lighthouse

pray tell what???
by madscientist
Sat Feb 05, 2005 6:05 pm
Forum: General Discussion
Topic: LED lighthouse
Replies: 31
Views: 7244

Re: LED lighthouse

NE5U, I am from Singapore, a little country whom escaped the tidal wave. Yup, it's some sort of school project. What's an insolation value? I have enough for 4 AA batts. I do not have a solar cell now, so I will be able to get what the circuit needs. the batts are 130AAHC 1.2V min 1250mAh standard c...
by madscientist
Sat Feb 05, 2005 8:04 am
Forum: General Discussion
Topic: LED lighthouse
Replies: 31
Views: 7244

LED lighthouse

I urgently need a circuit design. I need to power up 3 leds at 4.5v each. The leds need to be operating only in the dark. There are 2 sets of leds, they have to alternately switch on and off while operating (dimming in, holding and dimming out; one set on, the other off). There wont be AC source, so...