RE: Re: DIY Dimmer?

["Dr John Tankard" <john@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

You can use SSR's however as posted previously remember:-

Even when off there is a leakage current
This means the skt is live when off
You must match the SSR to the load, or you might find it lights when
off

John

> 
> 
> -- 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 the
> > 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 the
> > 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
> 
> 
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