On Sat, 2011-04-02 at 06:24 +0100, Steve Smith wrote:
> Horrible circuit common to nearly all lighting inverters.=20
>=20
> Goes a bit like this:-
>=20
> Little EMC choke and a small cap
> Varistor (if you are lucky)
> Rectifier
> Bigger cap about 0.22- 0.47
> Two transistor inverter with a diac to get it going
> Transformer
>=20
> Lamp
>=20
> The frequency is a bit voltage dependant and because there is a very smal=
l
> DC bulk cap it makes them spread the noise across a band a little. This h=
as
> the effect of limiting the EMC noise when measured with a quasi peak
> detector.
>=20
> Still a horrible little thing.=20

Based on the recommendation from a few here I tried a "normal" triac
based dimmer. No go. The lights were dimmed, but there was a very
audible buzzing sound all the time, and full brightness with the dimmer
was nowhere near full brightness without, so back to square one there.

Anybody know what's in the "electronic transformer" dimmers that lets
them work with these beasties?

Thanks, TTYL

--=20
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