i have always wanted to know what was in those multiturn pots,I had a Rough idea but wanted to see what was inside,thank you for taking the time so show us. great video 😀
Normally nichrome wire wound around a piece of enamelled copper wire. The wire is a heat spreader for the nichrome element. With long use the wiper wears out a section of the coil and goes notchy and intermittent.
Kind of how I expected it would work. I wonder though, do the tiny sub-min trimmer pots work the same way? The ones with the square body that need a screwdriver to set? It'd surely be difficult to squeeze all this stuff in. Great video though, and I think the only one explaining what's inside a multi-turn pot. One problem though is the noise. Dunno if you need a better mic, or to isolate your mic or camera better from electrical noise.
You made a good video about it. I liked it very much but you did not complete the video. You can make another video about this Ponty meter so that it is very expensive. We can't play like that. Thank you
cool ill bet if you spring everthing back out [if needed] and a cleaning and compressed air it will work again but lol thanks for video sir and God bless
Yours is one of the better-made Bourns types. They cheapened some these models by changing the machined brass bushing to a cast zinc bushing. When you tighten the nut on the newer ones, the bushing distorts and jams the shaft. I also noticed that on the newer ones, they left out the "C" ring that keeps the shaft from being pushed into the case. These usits can be easily broken by pushing on the shaft.
I've just bought a 10K, 10-turn Bourns pot, and was testing its linearity (asonishingly close!) with my grandson, and he asked how it works. I thought "I wonder if it's on RU-vid? _Everything_ is on RU-vid!" I had thought it was a 10-turn spiral around a drum, which was lifted off the drum by the wiper, so this was a revelation. Thanks.
Hi, I just bought two bourns one.When I measured ohm via multimeter it works perfect. Then I added with my arduino board but it did not work. Then I again tested via multimeter but it is not showing any resistance. Do you have any idea why??
I use these as a positioning sensor for a actuator. Any idea how long of a lifespan i can expect of these? When its rotating (intermittently) about 2 hours a day?
@@AlanGarfield I had a Bourns 500 ohm one in a power supply that was used maybe 3 or 4 times per week. It lasted about 6 years before it started to jump around. I chucked it out, but I suspect it was likely the wire surface getting dirty. It never went open-circuit, and was rated at 5W although it was barely dissipating 100mW. Cost about $10 or so back in 2002.
