Wayne Parham Messages: 18695 Registered: January 2001
Illuminati (33rd Degree)
Those lights come on pretty early, really. They limit current more when glowing because resistance goes up when the filament is hot. But the things they're protecting are sure to be safe that way.
The lamps would protect a driver without padding. The compensation components actually shift the point where protection is needed. So in this circuit, a pair of 211 bulbs make for very conservative protection, limiting more than is really necessary.
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