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On 1/12/24 06:21, Moose wrote:
> Dave,
>
> This is brilliant (figuratively AND literally) 8>)
>
> But is this safe? Â Couldn't it melt wires if there is a short?
As long as your wire won't melt when powering the bulb directly from a
power source, it'll be fine.
A light-bulb current-limiter is a technique that techs and hobbyists
sometimes use when repairing old audio amplifiers.
When the bulb's filament is cold, it has a pretty low resistance so it
doesn't usually affect the circuit. A 100W light bulb, for instance,
has a cold resistance of about 10 ohm. When plugged into a working
circuit that doesn't normally carry a lot of current, the bulb's
filament conducts but not enough to glow. If there's a short circuit
somewhere, much more current flows and it all gets dumped through the
bulb and it gets bright. Since the bulb is part of the circuit, it sets
an upper bound on the amount of current that can flow so by choosing
your bulb carefully, you can protect your fuses and the rest of the
circuit while you troubleshoot.
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<div class="moz-cite-prefix">On 1/12/24 06:21, Moose wrote:<br>
</div>
<blockquote type="cite"
cite="mid:OFB52CE02C.CA4D6450-ON85258AA2.003E4560-85258AA2.003E6FE0@mail.megageek.com">
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<font size="2" face="sans-serif">Dave,</font>
<br>
<br>
<font size="2" face="sans-serif">This is brilliant (figuratively
AND
literally) 8>)</font>
<br>
<br>
<font size="2" face="sans-serif">But is this safe? Â Couldn't it
melt wires if there is a short?</font></blockquote>
<p>As long as your wire won't melt when powering the bulb directly
from a power source, it'll be fine. <br>
</p>
<p>A light-bulb current-limiter is a technique that techs and
hobbyists sometimes use when repairing old audio amplifiers.  </p>
<p>When the bulb's filament is cold, it has a pretty low resistance
so it doesn't usually affect the circuit. A 100W light bulb, for
instance, has a cold resistance of about 10 ohm. When plugged
into a working circuit that doesn't normally carry a lot of
current, the bulb's filament conducts but not enough to glow. If
there's a short circuit somewhere, much more current flows and it
all gets dumped through the bulb and it gets bright. Since the
bulb is part of the circuit, it sets an upper bound on the amount
of current that can flow so by choosing your bulb carefully, you
can protect your fuses and the rest of the circuit while you
troubleshoot.</p>
<p><br>
</p>
<br>
<p><br>
</p>
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