Pilot Light blowing

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analogjunkie
Posts: 50
Joined: Thu May 27, 2010 10:30 pm

Pilot Light blowing

Post by analogjunkie »

I fired up my latest build, and the pilot light blew immediately. The fuse was fine, so I figured it was a bad bulb. Replaced the bulb and same thing happened. I tried the search function and couldn't seem to find a thread on the topic.

Has anyone had this problem? I am kind of afraid to turn it back on at this point.
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martin manning
Posts: 14308
Joined: Sun Jul 06, 2008 12:43 am
Location: 39°06' N 84°30' W

Re: Pilot Light blowing

Post by martin manning »

There are some sharp folks here, but no psychics that I know of. What circuit? LED (typical for D-type amp) or incandescent lamp? If it's an LED, perhaps the current limiting resistor you have installed is the wrong value?
LPSGME
Posts: 140
Joined: Sat Aug 08, 2009 12:20 am

Re: Pilot Light blowing

Post by LPSGME »

As Martin said, if the bulb is burning out then it's getting too much current.

If it's an LED then the limiting resistor may be either too small or shorted where it connects to the LED.

If it's an incandescent then you may be supplying too high a voltage somehow.

Have you read the voltage going into the bulb?

My ceriatone had a small incandescent (soldered into a mount) that blew. I think it was powered by 6 volts AC. I just replaced it with an LED and resistor.
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stelligan
Posts: 1465
Joined: Sat Sep 30, 2006 3:58 pm
Location: Nashvull

Re: Pilot Light blowing

Post by stelligan »

I got a mess of 3 volt lamps in a box that was marked 6 volts once. I blew 3 lamps before I discovered it. You may want to check the simplest of things first....
Good luck
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