Hi, all:-
Does anyone stock relatively low value (eg. 5 to 10 ohm) through-hole carbon composition resistors that are very small (eg. 0.1W rating)??
They have to be carbon composition for this application.
Small carbon composition resistors
Aug 28, 2009
28 Replies
Why comps? At those values, carbon or metal films will be about as inductive.
Comps might be a little better for absorbing big surges.
Mouser has 1/4 watt comps.
John
100mW thru-hole in carbon? Not much of a chance in North America, I guess you'll have to inquire in China. They still do a lot of thru-hole.
Regards, Joerg
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RS components have 1/8 watt carbon resistors but I don't remember the type.
"> Why comps? At those values, carbon or metal films will be about as
Maybe he's using them as temperature sensors? This might expalin the desire for small size. Carbon comps are also non-magnetic.
I think we buy 1/4 watt ones from digikey. (Ohmite 'little demon') George H.
More like heat loss sensors.
They have a couple of other advantages over "modern" parts- surge capability, and if you need extra noise, maybe for helping oscillators to start..
Trying for something with less surface area. I might be able to use BJTs.
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If it's a small temperature sensor you can use pn diodes too.
George H.
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-Lasse
If it's cryo, diodes work pretty well. Except in big magnetic fields.
John
Back in "the day" I specifically remember carbon comp 1/8 watt in all the standard values from 0.5 ohm to 22M, but I haven't seen any in the better part of 40 years.
Jim
The closest one can come is likely the composition glass bodied style mil spec jobs,that were like 1%. They were the "precision resistor" before metal film.
the
rYOU DON'T KNOW WHAT YOU ARE TALKING ABOUT
GIVE IT UP FREAK
I AM, PROTEUS
The real precision resistors were wirewounds. You could buy 0.01%, 5 PPM wirewounds in 1940.
John
the=20
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Sure, but they were rather inductive.
Depends on how they were wound... for example an number of Chaperon sections connected in series.
Best regards, Spehro Pefhany
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Google "Ayrton-Perry winding"
John
Not if they were wound right. There's a simple way of doing this - make a hairpin loop in the middle of the wire, then wind the two ends in opposite directions.
Cheers! Rich
JF
How about the distributed capacitance doing it that way? ;-)
Caddock makes some thick-film axial resistors that you can plug into a
50 ohm SMA female and make into a 500 or 1K ohm passive scope probe, good to 5 GHz or so. They use a tricky serpentine pattern on a ceramic tube.John
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