From: "Frank Bemelman"
References: <firstname.lastname@example.org> <email@example.com>
Subject: Re: Flickering Candlelight Effect??
Date: Thu, 2 Jan 2003 16:46:12 +0100
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NNTP-Posting-Date: 02 Jan 2003 15:46:18 GMT
"Jim Thompson" schreef in bericht
> On Thu, 2 Jan 2003 15:47:19 +0100,
> "Frank Bemelman" ,
> In Newsgroup: sci.electronics.design,
> Article: <firstname.lastname@example.org>,
> Entitled: "Re: Flickering Candlelight Effect??",
> Wrote the following:
> |I just tried my triple pwm thingy, with 3 incandescent lamps.
> |I've made a AVI file of it, http://www.euronet.nl/~fbemel/Files/
> |It's a bit out of focus.
> |Now we have to find a company that makes bulbs with 3 filiaments,
> |or use 3 of those tubelamps found in older stereo's.
> |It doesn't look bad, if you almost close your eyes, looking
> |through your eyelashes ;)
> Looks pretty good!
In real it looks much brighter/whiter. I used logaritmic lookup
tables, with some offset so each individual lamp is never completely
off. The frequency of each lamp is different.
Suppose if we wanted to make some replacement bulbs for those
common malibu garden lights, it would be nice to find some
clever way of running the lamps directly of the 12VAC.
A bridgerectifier would take up too much space, perhaps. There
is probably no need for a large capacitor.
But I am not very brilliant with minimum component count
Eh, so 4 x 1n4002, one 1n4148 plus 78L05 plus cap, a PIC12C508,
3 logic level fets. 3 lamps of 2-3 watt each.
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