CF Lightbulb Dimmer
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From: Bret Cahill on 24 Mar 2010 20:06 Just start subtracting cycles. Below 25% - 40% power it'll start to flicker. Bret Cahill
From: John Larkin on 24 Mar 2010 20:16 On Wed, 24 Mar 2010 17:06:18 -0700 (PDT), Bret Cahill <BretCahill(a)peoplepc.com> wrote: >Just start subtracting cycles. Below 25% - 40% power it'll start to >flicker. > > >Bret Cahill > Subtracting cycles? John
From: David Eather on 25 Mar 2010 07:06 On 25/03/2010 10:16 AM, John Larkin wrote: > On Wed, 24 Mar 2010 17:06:18 -0700 (PDT), Bret Cahill > <BretCahill(a)peoplepc.com> wrote: > >> Just start subtracting cycles. Below 25% - 40% power it'll start to >> flicker. >> >> >> Bret Cahill >> > > Subtracting cycles? > > John > MOC3041 + triac + variable duty cycle pulse train perhaps?
From: petrus bitbyter on 25 Mar 2010 08:46 "David Eather" <eather(a)tpg.com.au> schreef in bericht news:wo-dnV1AQs8-3jbWnZ2dnUVZ_tyrnZ2d(a)supernews.com... > On 25/03/2010 10:16 AM, John Larkin wrote: >> On Wed, 24 Mar 2010 17:06:18 -0700 (PDT), Bret Cahill >> <BretCahill(a)peoplepc.com> wrote: >> >>> Just start subtracting cycles. Below 25% - 40% power it'll start to >>> flicker. >>> >>> >>> Bret Cahill >>> >> >> Subtracting cycles? >> >> John >> > MOC3041 + triac + variable duty cycle pulse train perhaps? Don't think so. Using phase control the tube will not ignite below a certain voltage. As that limit is not sharply defined and there will always be some noise on the mains the tube starts to flicker. petrus bitbyter
From: Bret Cahill on 25 Mar 2010 11:43
> >Just start subtracting cycles. Below 25% - 40% power it'll start to > >flicker. > > >Bret Cahill > > Subtracting cycles? Instead of flashing 60 or 120 Hz it only flashes 30 or 60 cycles/sec. Eventually everyone will go to LED which is easy to operate at half power: add a half bridge rectifier. Lighting still requires a significant amount of power but it will be pain free reducing this cost. Bret Cahill |