I am not polarized about this video at all I had a barrel of fun watching it and I think it was great you obviously are a very intelligent individual and an excellent teacher I am bowing down in respect. ❤❤❤
this was super helpful thank you! my monitor wouldn't turn on but i wasn't sure if it was the monitor board or the power adapter... this let me check if the power adapter was OK (it was) and saved me the trouble of buying a replacement power adapter to test the monitor. much appreciated!
Hugely helpful, thank you! I needed to know how to measure barrel connectors, and this got right to the point and showed it both ways. Very much appreciate you.
Great tip for newbies. I have gotten many things to repair that folks have plugged in adaptor with wrong polarity and blew the crap out the guts. 90% of the time item's is beyond repair.
This was very helpful. I have some power supplies that have the voltage and current marked on them, but not the polarity of the plug and I was trying to find a correct power supply. I wasn't sure if I could just put the probes on the connectors directly or if it would blow up the multimeter. Nice to know it doesn't (assuming i'm using high enough voltage range at least)
Donate to www.patreon.com/electronzap This playlist th-cam.com/play/PLsAJMThMEUtr8yht55dgmA2TON8NfqaYH.html List of my videos th-cam.com/users/electronzapvideos www.amazon.com/shop/electronzapdotcom As an Amazon Associate I earn from qualifying purchases. Americans should check out one or more of those links before making any purchases. There's no extra cost to you. electronzap.com/ www.reddit.com/r/ElectronicsStudy/
an awful lot (most?) of these barrels connectors in consumer electronics are center-positive; but one area that is over-whelming center-negative are the power supps for guitar effects pedals. I'm sure there's some reason for that, but don't feel confident re: what it might be. VERY helpful video; thanks for posting this. :)
got a question. how come you dont get zapped when touching the outside of the (negative in this case)barrel of the plug? always wondered why most dc plugs have a few MM exposed barrel when fully plugged in, how is that safe?
You shouldn't feel anything if you touch both terminals of a power source that is well below 50 volts under normal conditions. Often the ground (negative) terminal is exposed because lots of things tend to share the same ground, so it is made easy to connect to. Only a proper load should also connect to the positive supply terminal. The biggest risk is metal touching both terminals at the same time (short circuit). Which can cause burns or injuries due to flying metal if it explodes.
I don't know. If you switch the red and black probe measuring positions, then a positive voltage should show as negative or a negative voltage should show as positive.
I am not polarized about this video at all I had a barrel of fun watching it and I think it was great you obviously are a very intelligent individual and an excellent teacher I am bowing down in respect. ❤❤❤
Thanks for watching!
this was super helpful thank you! my monitor wouldn't turn on but i wasn't sure if it was the monitor board or the power adapter... this let me check if the power adapter was OK (it was) and saved me the trouble of buying a replacement power adapter to test the monitor. much appreciated!
Glad it helped, thanks for watching!
Hugely helpful, thank you! I needed to know how to measure barrel connectors, and this got right to the point and showed it both ways. Very much appreciate you.
Glad you enjoyed, thanks for watching!
Great tip for newbies. I have gotten many things to repair that folks have plugged in adaptor with wrong polarity and blew the crap out the guts. 90% of the time item's is beyond repair.
That's a bummer! I haven't fried anything with reverse polarity yet, but I hear it's common.
why doesn't manufacturer prevent this completely with a 2 cent diode? That would safe-guard completely, right?
@@tonycarboni2002 Why do they care that you burn up your device. You buy a new one. They make more MONEY.
Thanks for the video. One comment for safety sake you should always put the positive probe in first. Positive probe should be removed last.
Thanks for the tip!
This was very helpful. I have some power supplies that have the voltage and current marked on them, but not the polarity of the plug and I was trying to find a correct power supply. I wasn't sure if I could just put the probes on the connectors directly or if it would blow up the multimeter. Nice to know it doesn't (assuming i'm using high enough voltage range at least)
Glad it helped, thanks for watching!
Useful information, and a belated Happy New Year Paul
Thanks, happy New Year!
I super glued the input cable to my laptop power supply to keep it from constantly falling out.
Donate to www.patreon.com/electronzap
This playlist th-cam.com/play/PLsAJMThMEUtr8yht55dgmA2TON8NfqaYH.html
List of my videos th-cam.com/users/electronzapvideos
www.amazon.com/shop/electronzapdotcom As an Amazon Associate I earn from qualifying purchases. Americans should check out one or more of those links before making any purchases. There's no extra cost to you.
electronzap.com/
www.reddit.com/r/ElectronicsStudy/
an awful lot (most?) of these barrels connectors in consumer electronics are center-positive; but one area that is over-whelming center-negative are the power supps for guitar effects pedals. I'm sure there's some reason for that, but don't feel confident re: what it might be.
VERY helpful video; thanks for posting this. :)
This is good question bc I notice that too. Can someone answer? Norm?
Thank you, I truly appreciate it! Peace
Thanks for watching!
I give thumbs up bc you sound like Norm MacDonald.
Nice!
Отличный урок! Очень интересная информация!
When testing the barrel plug polarity is the charger plugged into the life AC outlet?
Yeah, the power supply needs to be plugged in.
got a question. how come you dont get zapped when touching the outside of the (negative in this case)barrel of the plug? always wondered why most dc plugs have a few MM exposed barrel when fully plugged in, how is that safe?
You shouldn't feel anything if you touch both terminals of a power source that is well below 50 volts under normal conditions. Often the ground (negative) terminal is exposed because lots of things tend to share the same ground, so it is made easy to connect to. Only a proper load should also connect to the positive supply terminal. The biggest risk is metal touching both terminals at the same time (short circuit). Which can cause burns or injuries due to flying metal if it explodes.
Thank you!
Thanks for watching!
Happy new year :)
Happy New Year!
Why is my AC adapter barrel still positive when I reverse the red and black probes?
I don't know. If you switch the red and black probe measuring positions, then a positive voltage should show as negative or a negative voltage should show as positive.
@@ElectronzapMy bad it was an AC-AC adapter.
@@roadtonever oh, that makes sense then.
Yes but how do you test polarity of the device you are powering? 😏 (Happy New Year!)
I did think of that a bit, and I have no idea lol. Hopefully someone else replies with a good answer. Happy New Year!
:) Sometimes it helps if the device has at least one input or output ...
Plug it in and watch for smoke.
😂👉💥