Merry Christmas from New Zealand. I lived in DC back in 1999 so I look forward to any film views of my old haunts. You were a great help when I needed to get my head around a cnc machine I was given. Now up and running. Be encouraged that your hard work is very worthwhile to those of us who don't care to put in the work as you do.
Very good on information about how to check power amp out. I burned up a few diodes in my life. I just learned more about the volts staying close in volts. I burned up my background light up in my police scanner once because of wrong measurement in numbers.
Thanks Mark... The magic smoke is not so cool when the device is needed - Murphy says..... A $300.00 picture tube protects a 10 cent fuse by blowing first.
Good information. Thanks. An idea to try before you throw it out is to put batteries in it to see if that makes it work. If that does the trick, I would love to see you attempt to replace the diode or fuse since I have two devices with the same problem.
I'd like the see that, too. I managed to destroy a small reversing monitor (for use with a Raspberry Pi) by - I think - plugging in an AC adaptor, when it needed DC. Its components are really tiny, but nothing looked obviously fried. A lesson learned, at least it wasn't expensive.
We have the same piano, unfortunately I don't have the charger of it. I really want to use it than to put it to waste. I wish I can find a chord that can match my piano.
Companies might use backwards polarity on power jacks to effectively sabotage their own equipment, but you should remember Hanlon's razor: "Never attribute to malice that which could be adequately explained by stupidity." It's possible that someone made a mistake when making the final revisions to the printed circuit board, the company ordered a few thousand of them, realized the jack was backwards, and decided to use a reverse polarity jack instead of printing new PCBs or fixing them manually because it was cheaper and it wouldn't be a problem as long as customers used their wall adapter - which they were supposed to do anyway. It could also be the case that the circuit is only designed to work with a power supply that has some pretty specific specs. Giving it an oddball power jack reduces the chances that someone's going to use any old power supply that has the same current and voltage rating. If the circuit is revers voltage protected, it definitely wouldn't be sabotage because plugging in an incorrect power supply wouldn't do anything. On that note, I'm not sure why you said plugging in an improper plug will, "for sure pop that diode or fuse. Fuses aren't polarized so it doesn't matter which way you run the current as long as you don't draw more than the fuse can handle and the point of putting a diode in series with a load is to stop current from flowing backwards. When I say specific specs, I'm talking about the level of noise (random fluctuations in the voltage level) a power supply has and the actual level of voltage it's going to output at the current the circuit is drawing. The noise concern is pretty self-explanatory, but not everyone realizes that not all 9 volt power supplies supply 9 volts all the time. If a 9V, 1A power supply is unregulated (which a lot are), it's going to put out more than 9 volts if you're only running 250mA through it. How much more varies depending on the construction of the unregulated power supply, so using a different 9V,1A power supply could potentially blow something up if the designer was cutting it close with the voltage ratings of some of his components. If they put a linear regulator in the circuit, those need a certain amount of overhead voltage maintain a stable output, but also generate more heat the more overhead voltage they have to cut so using a different power supply could degrade the performance of the circuit or cause more heat than anticipated, potentially leading to fried components in the short term of reduced component lifespans in the short term. These things aren't always issues you have to worry much about, but when you do, I can see where it might be a good idea to make it harder for people to use a different power supply. I'm not saying that you should absolutely always use the manufacturer's power supply, just that there are some potential reasons why it might be a good idea for a company to use oddball stuff on some circuits.
Thank you for letting me know this Ron. I recently put up the donation link and did not have all the settings for PayPal correct. I have now fixed it (I hope) . Thank you again!
Merry Christmas from New Zealand. I lived in DC back in 1999 so I look forward to any film views of my old haunts. You were a great help when I needed to get my head around a cnc machine I was given. Now up and running. Be encouraged that your hard work is very worthwhile to those of us who don't care to put in the work as you do.
Merry Christmas to you as well and have fun in DC!!!
Thanks for the video. it was an eye-opener.
Have a Merry Christmas and a Happy New Year.
Thanks I got batteries! 🙌🏽🙏🏾
90% of audio power supplies are center negative. It has to do with the option of having batteries in the circuit without draining them.
Very good on information about how to check power amp out. I burned up a few diodes in my life. I just learned more about the volts staying close in volts. I burned up my background light up in my police scanner once because of wrong measurement in numbers.
Thanks Mark... The magic smoke is not so cool when the device is needed - Murphy says..... A $300.00 picture tube protects a 10 cent fuse by blowing first.
Good information. Thanks. An idea to try before you throw it out is to put batteries in it to see if that makes it work. If that does the trick, I would love to see you attempt to replace the diode or fuse since I have two devices with the same problem.
OK, I will save it and see if time permits me to do a fix.
I'd like the see that, too. I managed to destroy a small reversing monitor (for use with a Raspberry Pi) by - I think - plugging in an AC adaptor, when it needed DC. Its components are really tiny, but nothing looked obviously fried. A lesson learned, at least it wasn't expensive.
Thanks - needed this 👍
Merry Christmas
We have the same piano, unfortunately I don't have the charger of it. I really want to use it than to put it to waste. I wish I can find a chord that can match my piano.
nice keyboard
Companies might use backwards polarity on power jacks to effectively sabotage their own equipment, but you should remember Hanlon's razor: "Never attribute to malice that which could be adequately explained by stupidity." It's possible that someone made a mistake when making the final revisions to the printed circuit board, the company ordered a few thousand of them, realized the jack was backwards, and decided to use a reverse polarity jack instead of printing new PCBs or fixing them manually because it was cheaper and it wouldn't be a problem as long as customers used their wall adapter - which they were supposed to do anyway.
It could also be the case that the circuit is only designed to work with a power supply that has some pretty specific specs. Giving it an oddball power jack reduces the chances that someone's going to use any old power supply that has the same current and voltage rating. If the circuit is revers voltage protected, it definitely wouldn't be sabotage because plugging in an incorrect power supply wouldn't do anything. On that note, I'm not sure why you said plugging in an improper plug will, "for sure pop that diode or fuse. Fuses aren't polarized so it doesn't matter which way you run the current as long as you don't draw more than the fuse can handle and the point of putting a diode in series with a load is to stop current from flowing backwards. When I say specific specs, I'm talking about the level of noise (random fluctuations in the voltage level) a power supply has and the actual level of voltage it's going to output at the current the circuit is drawing. The noise concern is pretty self-explanatory, but not everyone realizes that not all 9 volt power supplies supply 9 volts all the time. If a 9V, 1A power supply is unregulated (which a lot are), it's going to put out more than 9 volts if you're only running 250mA through it. How much more varies depending on the construction of the unregulated power supply, so using a different 9V,1A power supply could potentially blow something up if the designer was cutting it close with the voltage ratings of some of his components. If they put a linear regulator in the circuit, those need a certain amount of overhead voltage maintain a stable output, but also generate more heat the more overhead voltage they have to cut so using a different power supply could degrade the performance of the circuit or cause more heat than anticipated, potentially leading to fried components in the short term of reduced component lifespans in the short term. These things aren't always issues you have to worry much about, but when you do, I can see where it might be a good idea to make it harder for people to use a different power supply.
I'm not saying that you should absolutely always use the manufacturer's power supply, just that there are some potential reasons why it might be a good idea for a company to use oddball stuff on some circuits.
Can i use 12 volt adapter on a casio keyboard 9,5 volt ?
Which Casio have you got
I am a time traveler plz give recipie for time machine it is heavily damaged plz help me 😭
Anybody watching on 2022
Me😊
Me lol
BY ALL MEANS, HAVE A "COOL YULE & A FRANTIC FIRST"....
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Thank you for letting me know this Ron. I recently put up the donation link and did not have all the settings for PayPal correct. I have now fixed it (I hope) . Thank you again!
Steve thanks for the good wishes. Have a safe trip and looking for your return in 2017. Could be a keyboard autopsy coming eh?
Electronic Conspiracies... Believe it... or not!
I beLIEve
Thanks for this video. Happy holidays and new year!