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loss1234
Joined: Jul 24, 2007 Posts: 1536 Location: nyc
Audio files: 41
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Posted: Mon Oct 22, 2007 4:20 am Post subject:
salvaged tempcos? |
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did they ever use tempco's in old tv sets?
i am taking one apart and there are these weird resistors that have thick leads, and are long and cylindrical. also, they seem to be covered in a weird chalky paste (and are sort of pastel colored)
could these be tempcos? if not, any ideas on what they are?
they are definitely resistors but just not sure what type.
any other salvage sources for tempos?
why dont mouser or jameco carry them?
thanks _________________ -------------------------------------------- check out various dan music at: http://www.myspace.com/lossnyc
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Pehr
Joined: Aug 14, 2005 Posts: 1307 Location: Björkvik, Sweden
Audio files: 2
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Rykhaard
Joined: Sep 02, 2007 Posts: 1290 Location: Canada
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Posted: Mon Oct 22, 2007 7:42 am Post subject:
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Being pastel coloured - if they have a rough feeling body (instead of smooth) they could be fireproof resistors. One type, that are allowed to become extremely hot. I've seen these in pastel pink and pastel green, over the years. They're not tempco's though.
You could go with the surface mount type from Digikey for $0.75 each. They're what I use for all of my tempco requirements. (VCOs, VCFs). |
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loss1234
Joined: Jul 24, 2007 Posts: 1536 Location: nyc
Audio files: 41
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Rykhaard
Joined: Sep 02, 2007 Posts: 1290 Location: Canada
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Posted: Mon Oct 22, 2007 10:28 am Post subject:
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loss1234 wrote: | but how do you mount a surface mount resistor? that sounds like no fun at all.
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SM resistors would be especially easy on perfboard. If I'm not mistaken, they're small enough that you could solder 1, covering one hole, with each end soldered to each pad on the other side of that hole.
As long as both ends of the resistor do NOT short the hole in the center (1 of them doing so would be fine), everything would be ok.
You could also solder the wires to connect each end, through the very same holes.
Now, that I've thought of that - I think I'll use THAT method rather than my previous method of making a miniature PCB to solder the SM resistor to.
I'll post a photo of my own doing it, once it's finished.
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arent there any mail order places (all electronics, mouser, jameco) that sell tempcos? and why dont they?
thanks.. |
Very low marketability for them. They aren't used in many places at all. Hence, the MUCH higher price for the normal axial body ones. |
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Nosferatu
Joined: Jul 27, 2007 Posts: 234 Location: Planet Rock.
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Posted: Mon Oct 22, 2007 12:34 pm Post subject:
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Quote: | You could go with the surface mount type from Digikey for $0.75 each. They're what I use for all of my tempco requirements. (VCOs, VCFs). |
Do you have the digi number for them?
Panasonic? |
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Rykhaard
Joined: Sep 02, 2007 Posts: 1290 Location: Canada
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Posted: Mon Oct 22, 2007 9:05 pm Post subject:
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Nosferatu wrote: | Quote: | You could go with the surface mount type from Digikey for $0.75 each. They're what I use for all of my tempco requirements. (VCOs, VCFs). |
Do you have the digi number for them?
Panasonic? |
P1.0KCDCT-ND
Catalogue page: http://dkc3.digikey.com/PDF/T052/1071.pdf
(Both were pulled from archived email, from the SDIY list. Apparently searching in the catalogue FOR the above part #, doesn't work.)
That's the one that I use though. They sell them in packs of 10.
Hope this helps. |
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slo
Joined: Feb 18, 2007 Posts: 204 Location: Victoria, BC
Audio files: 1
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Posted: Mon Oct 22, 2007 9:53 pm Post subject:
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I tried to solder those little things and had no luck....yet. Check the page below, he used them in a Mankato build. I think he spins them in a drill and coats them with epoxy to finish.
http://modularsynthesis.com/magicsmoke/mse.htm |
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mediatechnology
Joined: May 10, 2006 Posts: 80 Location: Oak Cliff, Texas USA
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Posted: Tue Oct 23, 2007 9:28 pm Post subject:
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WRT your original question you might be seeing PTC thermistors which are used for degaussing a CRT. They have a low cold resistance to operate the degaussing coil on turn-on and once warm (hot actually) reduce coil current. They are usually disc-shaped. I suspect that they are highly non-linear. |
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