You gotta love this.
sansuibutch
Posts: 198
Comments
-
But -- apparently it didn't know that resistance is futile...
Maybe it needs a little camera and some image recognition s/w.
... or maybe that cap just has high internal resistance
-
mhardy6647 wrote: »But -- apparently it didn't know that resistance is futile...
Maybe it needs a little camera and some image recognition s/w.
... or maybe that cap just has high internal resistance
Its not a capacitor, its a polyswitch. -
sansuibutch wrote: »mhardy6647 wrote: »But -- apparently it didn't know that resistance is futile...
Maybe it needs a little camera and some image recognition s/w.
... or maybe that cap just has high internal resistance
Its not a capacitor, its a polyswitch.
Well, then, it was righter than I was -- looks like you got your money's worth!
-
And another
-
And another. These are out of a set of crs
These a -
-
-
These two I cant remember where they came from but pretty sure the bigger one with lower resistance came from one of my sda srs.
-
-
For the record they are actually called Thermistors. They were used in CRT monitors and televisions among other things. They are used for voltage regulation, volume control, time delays, and circuit protection. In CRT's they were used for the degaussing circuit to wipe off the previous image on the screen. The number you see on the side (-050 and -090) are trip points, the larger the number the more they could handle before tripping. Unfortunately they would trip easier the more times they were tripped. My SDA's polyswitches were so wore out that they would trip very very easily. Even with good amplification they would trip at about 20-30 watts. When we replace them with resistors we use a .5 ohm resistor to closely equate the resistance of the Thermistor(polyswitch) circuit so the tweeter is not too hot (loud).
If I remember correctly the -050 was used in speakers that had a .75amp fast blow fuse for protection. The -090 was used in speakers that had used a 1amp fast blow fuse. -
For the record they are actually called Thermistors. They were used in CRT monitors and televisions among other things. They are used for voltage regulation, volume control, time delays, and circuit protection. In CRT's they were used for the degaussing circuit to wipe off the previous image on the screen. The number you see on the side (-050 and -090) are trip points, the larger the number the more they could handle before tripping. Unfortunately they would trip easier the more times they were tripped. My SDA's polyswitches were so wore out that they would trip very very easily. Even with good amplification they would trip at about 20-30 watts. When we replace them with resistors we use a .5 ohm resistor to closely equate the resistance of the Thermistor(polyswitch) circuit so the tweeter is not too hot (loud).
If I remember correctly the -050 was used in speakers that had a .75amp fast blow fuse for protection. The -090 was used in speakers that had used a 1amp fast blow fuse.
Yes Im familiar with them. None of the speakers they were removed from had fuses. Maybe in polks earlier days. -
sansuibutch wrote: »For the record they are actually called Thermistors. They were used in CRT monitors and televisions among other things. They are used for voltage regulation, volume control, time delays, and circuit protection. In CRT's they were used for the degaussing circuit to wipe off the previous image on the screen. The number you see on the side (-050 and -090) are trip points, the larger the number the more they could handle before tripping. Unfortunately they would trip easier the more times they were tripped. My SDA's polyswitches were so wore out that they would trip very very easily. Even with good amplification they would trip at about 20-30 watts. When we replace them with resistors we use a .5 ohm resistor to closely equate the resistance of the Thermistor(polyswitch) circuit so the tweeter is not too hot (loud).
If I remember correctly the -050 was used in speakers that had a .75amp fast blow fuse for protection. The -090 was used in speakers that had used a 1amp fast blow fuse.
Yes Im familiar with them. None of the speakers they were removed from had fuses. Maybe in polks earlier days.
Yes they replaced the fuse holders Polk previously used instead of the polyswitch. Polk also pre tripped them so they would trip easier at the desired point. -
sansuibutch wrote: »For the record they are actually called Thermistors. They were used in CRT monitors and televisions among other things. They are used for voltage regulation, volume control, time delays, and circuit protection. In CRT's they were used for the degaussing circuit to wipe off the previous image on the screen. The number you see on the side (-050 and -090) are trip points, the larger the number the more they could handle before tripping. Unfortunately they would trip easier the more times they were tripped. My SDA's polyswitches were so wore out that they would trip very very easily. Even with good amplification they would trip at about 20-30 watts. When we replace them with resistors we use a .5 ohm resistor to closely equate the resistance of the Thermistor(polyswitch) circuit so the tweeter is not too hot (loud).
If I remember correctly the -050 was used in speakers that had a .75amp fast blow fuse for protection. The -090 was used in speakers that had used a 1amp fast blow fuse.
Yes Im familiar with them. None of the speakers they were removed from had fuses. Maybe in polks earlier days.
Yes they replaced the fuse holders Polk previously used instead of the polyswitch. Polk also pre tripped them so they would trip easier at the desired point.
Gotchya. Thats makes sense.
