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'[EE]: dimmer chip - flickering?'
2001\11\27@162021 by Micro Eng

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so...how about a dimmer that flickers? I thought I saw something about this
a few years ago on the list.  I have some lights that might be cool to
simulate candles, rather than just dimming...

>From: "Chris Loiacono (E-mail)" <spam_OUTchris01TakeThisOuTspamTAMPABAY.RR.COM>
>Reply-To: .....chrisKILLspamspam@spam@mail2asi.com
>To: PICLISTspamKILLspamMITVMA.MIT.EDU
>Subject: Re: [EE]: dimmer chip
>Date: Fri, 23 Nov 2001 01:28:01 -0500
>
>Yes, several based on 18C442's. Why?
>
>Chris
>
> > {Original Message removed}

2001\11\27@163050 by chris

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I once injected a RND generator into the digital side of one of my
phase-angle controllers, and disabled the soft-start routine. I would say it
was pretty much like a flickering candle, although it was really a test to
see if my thyristors could take it....
It would be kind of costly for a hobby item though.....

Chris

> {Original Message removed}

2001\11\27@205245 by M. Adam Davis

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You can experiment with putting two dimmers in series.  They will
interfere with each other for a crude (but adjustable) flicker.
Depending on the dimmers you use it can get pretty random as well.

But for simpler solutions, search google for terms such as candle
simulation, stage lighting, halloween stuff, etc.  There is lots of
stuff out there, and you'll likely get a better result without a PIC
than with one.

-Adam

Micro Eng wrote:

{Quote hidden}

>> > {Original Message removed}

2001\11\27@225141 by Vern Jones

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Try the MOC3031 trick (opto isolator/triac trigger) with pulses above
and below 120 Hz, with a random seed, and average carrier frequency of
120 Hz. So that it behaves as am FM signal at 120 Hz,  with a low
frequency random noise waveform, or noise through a lowpass filter with
a cutoff frequency of about 5 to 6 Hz as the modulating signal.

Vern



"M. Adam Davis" wrote:
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2001\11\27@225151 by Peter Wintulich

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I recall a non micro solution. Use a fluro starter in series with the light. Probably won't work through a dimmer though. EMC may be a problem as well?

Regards Peter
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2001\11\28@035404 by chris

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You'll need cheap dimmers with slow snubbers and high capacitance on the
gate circuits for this kind of cross-talk. Nowadays, anything other than
'Leviton' home wiring devices are pretty immune to this kind of stuff- we
have  to test our power controllers by placing several on the same lines to
ensure that the gating remains unaffected.

What is the application in question, anyway?
C

> {Original Message removed}

2001\11\28@103621 by Mike Blakey

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many years ago I made a very effective flickering dimmer by placing a florescent
light starter in series with the lamp, the effect was very natural, although it
will probably reduce the lamp life.






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so...how about a dimmer that flickers? I thought I saw something about this
a few years ago on the list.  I have some lights that might be cool to
simulate candles, rather than just dimming...

>From: "Chris Loiacono (E-mail)" <RemoveMEchris01spamTakeThisOuTTAMPABAY.RR.COM>
>Reply-To: chrisEraseMEspam.....mail2asi.com
>To: EraseMEPICLISTspamMITVMA.MIT.EDU
>Subject: Re: [EE]: dimmer chip
>Date: Fri, 23 Nov 2001 01:28:01 -0500
>
>Yes, several based on 18C442's. Why?
>
>Chris
>
> > {Original Message removed}

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