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What is a positor?

D

dave

Jan 1, 1970
0
I'm helping a friend repair a tv and came across what is termed a
positor in the power supply - what is it, and what does it do? (and
how do I test it!)
I've seen people refer to these as PTC resistors (I know what these
are) but this device has three legs.
 
E

Eric

Jan 1, 1970
0
a "posistor" is the same as a "PTC"
maybe PTC sands for Posistor T??? C??? does anybody else know?

just like "frame" is the same as "field"


: I'm helping a friend repair a tv and came across what is termed a
: positor in the power supply - what is it, and what does it do? (and
: how do I test it!)
: I've seen people refer to these as PTC resistors (I know what these
: are) but this device has three legs.
 
W

Wolfgang Mahringer

Jan 1, 1970
0
Hi Eric,
a "posistor" is the same as a "PTC"
maybe PTC sands for Posistor T??? C??? does anybody else know?

That stands IMHO for "Positive Temperature Coefficient"

HTH
Wolfgang
 
E

Eric

Jan 1, 1970
0
thanks I forgot that, Sorry I have these dork attacks from time to time.






: Hi Eric,
:
: Eric schrieb:
: > a "posistor" is the same as a "PTC"
: > maybe PTC sands for Posistor T??? C??? does anybody else know?
:
: That stands IMHO for "Positive Temperature Coefficient"
:
: HTH
: Wolfgang
:
 
C

Chaos Master

Jan 1, 1970
0
Eric scribbled:
a "posistor" is the same as a "PTC"
maybe PTC sands for Posistor T??? C??? does anybody else know?

Positive Temperature Coefficient, AFAIK.
 
W

Watson A.Name - Watt Sun

Jan 1, 1970
0
a "posistor" is the same as a "PTC"
maybe PTC sands for Posistor T??? C??? does anybody else know?

Positive temperature coefficient resistor. Aonther name that might be
used is PTC varistor.

: I'm helping a friend repair a tv and came across what is termed a
: positor in the power supply - what is it, and what does it do? (and
: how do I test it!)
: I've seen people refer to these as PTC resistors (I know what these
: are) but this device has three legs.


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G

Graham W

Jan 1, 1970
0
Watson A.Name - Watt Sun said:
Positive temperature coefficient resistor. Aonther name that might be
used is PTC varistor.

This is the device that controls the current in the de-gaussing circuit.
It is 2 TC pellets. One is a PTC and the other is an NTC. One is in
series with the mains AC input to the coil and the other is across
the coil acting as a shunt.

They are in thermal contact with each other so that the one which gets hot
controls the other one. I'll leave it to the reader to decide which is
which. 8¬)
 
F

Fred Abse

Jan 1, 1970
0
ositive temperature coefficient resistor. Aonther name that might be
used is PTC varistor.

More preferably "PTC thermistor"

"Varistor" is usually taken to mean the type of voltage dependent resistor
(VDR) that exhibits a very high resistance up to a well-defined threshold
voltage then abruptly changes to low resistance (Panasonic ZNR, Siemens
(Epcos) SIOV, etc).
 

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