Re: DIY Dimmer?

["poulton_s" <swp@xxxxxxx>]

John, et al,

Whilst thinking about dimmers, does anyone have any ideas for 
replacing
an existing light switch, with an electronic switch of some sort 
? In my
situation a switch is all thats required as I've got energy saving
lights everywhere, however I don't want a relay, switching must be
silent :)

Stuart


-- In ukha_d@y..., "Dr John Tankard" <john@s...> wrote:
> 
> > Manual can be found here :)
> > 
> > http://www.velleman.be/downloads/0/Manual_K8028.pdf
> > 
> 
> The functions, are not what I would call extensive however I do 
like the
> idea of measureing phase shift to determin that the load is too
> inductive and also that there is a triac fault, I have to say I 
am not
> sure how this is done, there appears to be just two inputs from 
the hot
> side, one is clearly a zero cross detect circuit the other 
appears to
> reverse bias a zener diode to triger a transister on the 
positive half
> wave, the reverse bias would trigger when the triac had not 
fired, and
> would switch off when the triac fires at the desired phase 
angle, with a
> high inductive load I assume there would be a delay in the time 
>from
> triac fire to the time when the zener starts to behave like a 
normal
> diode again.
> 
> I like the idea, however in my design I don't power my micro 
>from
> powerline as is done in this design, this is bacause my triac is
> opto-isolated from the hot side (because this connects to my 
home
> network I don't want to fry all my toys). To add this feature I 
cannot
> see how I could do it without adding a power line supply.
> 
> John

Yahoo! Groups Sponsor

ADVERTISEMENT

http://www.automatedhome.co.uk
Post message: ukha_d@xxxxxxx 
Subscribe:  ukha_d-subscribe@xxxxxxx 
Unsubscribe:  ukha_d-unsubscribe@xxxxxxx 
List owner:  ukha_d-owner@xxxxxxx
List of UKHA Groups here - http://groups.yahoo.com/group/UKHA_Grouplists/

Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.