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salvaged tempcos?
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loss1234



Joined: Jul 24, 2007
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PostPosted: Mon Oct 22, 2007 4:20 am    Post subject: salvaged tempcos? Reply with quote  Mark this post and the followings unread

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

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Pehr



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PostPosted: Mon Oct 22, 2007 4:51 am    Post subject: Re: salvaged tempcos? Reply with quote  Mark this post and the followings unread

loss1234 wrote:
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?


Could be high power resistors (high W rating). Confused

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Rykhaard



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PostPosted: Mon Oct 22, 2007 7:42 am    Post subject: Reply with quote  Mark this post and the followings unread

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. Sad

You could go with the surface mount type from Digikey for $0.75 each. Smile They're what I use for all of my tempco requirements. (VCOs, VCFs).
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loss1234



Joined: Jul 24, 2007
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PostPosted: Mon Oct 22, 2007 9:55 am    Post subject: Reply with quote  Mark this post and the followings unread

but how do you mount a surface mount resistor? that sounds like no fun at all.
arent there any mail order places (all electronics, mouser, jameco) that sell tempcos? and why dont they?


thanks..

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Rykhaard



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PostPosted: Mon Oct 22, 2007 10:28 am    Post subject: Reply with quote  Mark this post and the followings unread

loss1234 wrote:
but how do you mount a surface mount resistor? that sounds like no fun at all.


SM resistors would be especially easy on perfboard. Smile 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. Smile
I'll post a photo of my own doing it, once it's finished.

Quote:

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. Sad
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Nosferatu



Joined: Jul 27, 2007
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PostPosted: Mon Oct 22, 2007 12:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
You could go with the surface mount type from Digikey for $0.75 each. Smile 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
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Location: Canada

PostPosted: Mon Oct 22, 2007 9:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

Nosferatu wrote:
Quote:
You could go with the surface mount type from Digikey for $0.75 each. Smile 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. Smile
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slo



Joined: Feb 18, 2007
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PostPosted: Mon Oct 22, 2007 9:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

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

PostPosted: Tue Oct 23, 2007 9:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

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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