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Gareth Magennis said:By the way,
What's the antithesis of Occam's razor?
dunno but talking to a philosopher last week for his take on occam's
razor
,
he put me right in that it is a mistranslation of Occam's raison ...
s.com> said:You must be quite the hit with the ladies.
William Sommerwerck said:Then what causes my bulk eraser to shut off when it overheats -- then come
back when it cools off?
Gareth Magennis said:What's the antithesis of Occam's razor?
** Have a fucking look.
That's a resettable *thermal* fuse, NOT a fuse designed for
overcurrent protection.
I love the fact I have a name that so lends itself to stupid wordplay.
I had always thought that at least some polyfuses /were/ resettable.
This 300W amp blows correct T3.15A fuses every now and then at sw on. The
owner left in the last one so I can see it is just "tired" , neat break and
2 constituent parts of fuse wire remaining.
Any issues concerning putting in an ex pc SMPS 450W, 250V land mains inrush
thermistor, unknown specs, other than 14mm diameter, 4mm wide , 1mm diam
leads, 8R cold , 1R after 20 seconds touched by soldering iron barrel. Other
than poor physical integrity of the lead "welds" to the body (like disc
ceramic cap) - will mount on small high temp board and wire into the neutral
side of the wiring, with plenty of clear air space around.
Other than zero crossing Triac sub-cicuit to delay sw off, not creating
ferrite core residual magnetism, and delayed switching on also, any other
ways around this phenomenon other than bad practise uprating of the mains
fuse? Are polyswitches used in these circumstances , ie not purely "fuse"
action or generic name for devices specific for this purpose?
What a BORING know nothing, fuckwit bullshit artist
Also keep in mind as a possibility that the main filter caps are getting
tired, and a bit leaky, so that if the amp has not been switched on for a
week or 2, it might have abnormally high inrush current as the caps
charge/form back up.
Lastly, the older 'spring wire' fuses seemed more tolerant of the inrush
current
compared to the modern chemically treated wire ones.
It would be helpful if you would mention the make and model of the product
in your posts.
Polyfuses (in the sense of the term I've always heard used) are
self-resetting, unless you hit 'em so hard that you damage them.
They aren't designed for use at mains voltages/currents, though... at
least, I haven't seen any that are.
The self-resetting thermal "fuses" that you'd find in a bulk eraser or
similar "not intended for a 100% duty cycle - let it cool down!"
device are (I think) of the bimetallic type, somewhat akin to what you
would find in a traditional wall thermostat.
Me neither, other thing with polyfuses is that there's approx 2:1 current
difference between trigger point and hold point.
N_Cook <[email protected]> said:This green thermistor limiter 10 deg C over ambient with no throughput and
20 deg C over with 0.4 amp mains with amp driving load.
Bit warmer than I would be comfortable with.
Mike Tomlinson said:Bit warmer than I would be comfortable with.