Re: X10 signals can be TOO strong!

[Marc_F_Hult <MFHult@xxxxxxxxxxxxxxxxxxxxx>]

On Thu, 14 Dec 2006 20:57:00 GMT, "Jeff Volp" <JeffVolp@xxxxxxx> wrote in
message  <wUigh.204530$Fi1.46779@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>:

>"Marc_F_Hult" <MFHult@xxxxxxxxxxxxxxxxxxxxx> wrote in message
>news:mq83o2hlqekk3hedvqoml7din3bhcgikfl@xxxxxxxxxx
>> On Thu, 14 Dec 2006 19:03:32 GMT, "Jeff Volp" <JeffVolp@xxxxxxx> wrote
in
>> message  <8ehgh.491908$QZ1.430735@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>:
>
>> It should be noted that the problem of unintended turn-on of TRIACs is
>> as old as  TRIACs themselves. This is why virtually all TRIAC dimmer
>> circuits use some sort of snubber circuit to prevent self-triggering. I
>> am skeptical of the conclusion that the problem has to do with the
>> 'quality' ("least expensive") of the TRIACs used.
>
>Interesting.  When dimmers first hit the market there was that BUZZ
>problem in radios.  I thought the snubber circuit was to reduce RF
> radiation.  In fact, Leviton says "RFI Filter - Suppresses radio
>frequency interference" on their rotary dimmers.
>
>Jeff

RF is also a concern and reason for snubbers, but not the only one.

from http://www.fairchildsemi.com/an/AN/AN-3008.pdf
(among many other possible references):

	" Application Note AN-3008
	RC Snubber Networks for Thyristor Power Control and
	Transient Suppression
	www.fairchildsemi.com
	REV. 4.01 6/24/02
	Introduction
	RC networks are used to control voltage transients that could
	falsely turn-on a thyristor. These networks are called snubbers. "


HTH ... Marc
Marc_F_Hult
www.ECOntrol.org