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May 26, 2020, 07:41:48 PM

Author Topic: Uncle Doug's Light Bulb Current Limiter  (Read 895 times)

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Offline oguinn

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Uncle Doug's Light Bulb Current Limiter
« on: July 24, 2018, 06:30:56 AM »
I was watching some of Uncle Doug's YouTube videos and stumbled on one where he built a current limiter using a high watt light bulb. I wanted to see what other people thought of this as a safety device - is it worth building one?

Jameson O’Guinn


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Offline Doc B.

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Re: Uncle Doug's Light Bulb Current Limiter
« Reply #1 on: July 24, 2018, 08:24:47 AM »
Kelvin built one that we keep in the lab for bringing up gear that might have a fault that makes it draw excess current. That and a Variac are good tools to have if you are doing repair work.
Dan "Doc B." Schmalle
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Offline mcandmar

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Re: Uncle Doug's Light Bulb Current Limiter
« Reply #2 on: July 25, 2018, 02:04:15 AM »
I got fed up with variacs, light bulb limiters, and meters all over the desk so i built them all into one enclosure.  With the flick of a switch i can take the variac or limiter out of the circuit while the connected device is running 8)

If you are restoring old gear a variac and limiter is a must have.  Even building amps from scratch i highly recommend using them for the first power up, it has helped me catch a few mistakes in the past before i fried something.