17 Aug
2010
17 Aug
'10
9:38 p.m.
Christian wrote....
I wonder...
If it's unfiltered (no smoothing cap) from a bridge rectifier, then the
ratio of RMS (which is what lamps care about) to peak is sqrt(2). Which
means an 11V rms supply is about 15V peak.
I would be inclined to put a voltmeter on that supply and see what it
reads. I would also stick a 'scope on it, to see if it really is an
unfiltered supply.
-tony
Yep. Each lamp draws about 10ma in order to keep
them warm and to avoid
large surge currents when they're driven on. The supply should actually be
15V unfiltered and unregulated coming directly off a bridge, not 11V.
Ok, I'm
confused then. The schematics (and the theory of operation verbiage
{long}) all clearly state 11v for the lamps. Is it possible you're thinking