Interesting mass produced PTC switch.
Added 2019-11-07 04:27:31 +0000 UTCWho would have thought a $1 component from a fridge could be so much fun. This is a very interesting device that has the primary function of de-energising a compressor's start winding after a short delay. But it has loads of other applications.
The units are available in several start resistances from 4.7 ohm to 33 ohm. I'd guess that the lower the start resistance the higher the current that will be required to trigger it.
I've included a generic eBay link in the video description on YouTube.
These could be used to protect some loads against long run times or high overloads if the characteristics matched.
These modules could also be used for replacing the centrifugal start switch on older motors in some applications.
Comments
I did ponder whether they could be used for that. They seem much smaller, but then again things have evolved. I guess the trail-off has to be slow enough to ensure no residual magnetic field.
Big Clive
2019-11-07 14:34:57 +0000 UTCLooks like this very simple device also simplifies the wiring of the "compressor". Power into to one of the lugs on same side, run winding wire to the other one on that side, and the start winding on the single terminal on the other side.
Roger Reinsch
2019-11-07 12:11:52 +0000 UTCThey were commonly used in old CRT TV's to power the Degaussing coil at the front of the CRT. Causing the characteristic loud booonnng when you fist switched on the tele.
Charles Bruckner
2019-11-07 11:48:37 +0000 UTCSomeone put an enormous amount of effort into making that such a โsimpleโ device, with the sockets on the front to plug straight onto hermetic compressor start and run pins, and the quick connects on the rear for power and a run capacitor (if required). Add to that, there are none of the moving parts that used to carbon up and burn out on the mechanical ones, thanks for doing the video Clive, it is a device I come across almost daily and I never give them a second thought.
2019-11-07 11:06:49 +0000 UTCSo cool! I love these forays into devices such as these. - and it seems that we all just start trying to think of interesting ways to apply them! Awesome sauce, friends!
Michael Thompson
2019-11-07 11:03:06 +0000 UTCRight ON, but NOT right back on ! Great Info.
2019-11-07 05:45:57 +0000 UTCThat's a hugely complicated subject. It would be quite a feat to give the kids individual microphones. Without them they will probably be a bit quiet, so any reinforcement of other elements could be really loud by comparison.
Big Clive
2019-11-07 04:48:34 +0000 UTC
