In article ,
Michael A. Terrell wrote:
What is the rated power output of the power supply? If it's a small
one only feeding a pre-amp it likely can't drive the 5 watt or so lamp
in the switch. Which could take over 500mA at switch on. A better
choice would be an LED - only about 20mA or so.

Generally car stuff like this isn't too concerned about efficiency.


Did you look at the link? There is no way the lamp is 5 watts. It
would melt the switch's body. It should be 10 to 50 mA. Think 'Grain
of Wheat' lamp.

Whatever. But the principle remains - filament lamps have a high start up
current which could be too great for a small regulated supply.

--
*Never miss a good chance to shut up.*

Dave Plowman London SW
To e-mail, change noise into sound.