Em 28/2/2011 16:20, Olin Lathrop escreveu:
> The control circuit can be as simple as switching a relay driving the bul=
bs
> on or off every two seconds or so.

Perhaps not a good idea for the present circuit. The bulbs would be
subjected to a little thermal ripple. Although of low amplitude, the two
second thermal cycles could mechanically stress the filaments, defeating
your idea of running the bulbs below their rated voltages.

I think it would be better to use a TRIAC and control the conduction
angle or at least skip some half-cycles. It would be less noisy also.

The idea of the light bulbs is very good, because with the device open
the temperature would stay at a safe lower level.


Isaac

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