Thanks for giving this idea for my research......... and i would like your class thanks sir........please send your contact number in this email sir...... By Anil Chandran(india)
@@skycarl Hi Carl. Lol Sometimes I feel that way : ) My email provider sends me the spam and puts the emails I want you guessed it in the spam. This has gotten worst this year. It gets me behind and then I have less time to comment. So Know that I do watch ,Like Share and add to Playlists. And I try to give everyone one a thumbs up in the comments I am the little guy behind the curtain so to speak : ) So just remember when you see comments with a thumbs up,9 times out of 10 I have been there. All my best buddy. Bobby
hay Bobby, wassshappening? goot to see ya! many tubers split like a banana, like that Tim Chad Bob and Chris who hide on fb now.? hey check out that Laura Loomer on the "wall", good stuff. Don
Good video. You do have to keep the impedance of the load in mind because it'll throw off your voltage divider, and you have to be careful about your signal because your - rail is still tied to earth ground unless you have the power supply isolated
Yeah, a future video with this powering a circuit, showing the different readings through the circuit would be a good idea. It would show what's going on and what to expect. Thanks as always.
Thanks for the tip Carl. I've come across this issue like you mentioned with Op Amp circuits. I don't have a supply that has a negative source either. I think I have taken two 9 volt batteries in series in the past, and made the junction where they connect together the virtual ground and it did give me the +9v & -9v. But the circuit you showed there with the 2 resistors would be good for use with the power supply.
It's funny Pete but I was doing the very same set up with two 9v batteries when I thought of doing this video. I had used this setup before so I went from there. Thanks so much.
Thank's, Carl, for provoking thought - which needed to be considered. I've taken the three 'el cheapo lab-grade power supplies' for granted, as tools, and only as tools. I've been messing with a Mitel SX50 Phone Trunking Board, which has a -11.4v reference voltage required, to notify another circuit - on another board, that a "ground-start call notification" has been received, it's the system that the PBX design uses to transfer calls between subsystems. It's been driving me nutz, because the system will not recognize two important extensions on what I thought was a failed trunk, which actually may be a poor connection causing me to lose reference voltage, where I've been blaming "rotten refurbished boards". I'll dig into it tomorrow, thanks Carl
Always a pleasure to help Tim. I knew you was going to get that hidden message of a solution to that problem. Problem today is nobody is psychic anymore so what can one do. Always good to hear from you my friend. ps,, hope all is going okay with the DC-3 investigation.
Thats great Carl. I see a meter in your video I don't have... hmmmmmm.... should I add it to my collection ? LOL Good stuff my friend, I learned something valuable here. Thank you !! Ron
Thanks Ron,,, yeah buddy they are a pretty nice meter. I've had it for several years now and it's worked very well for me. I have to grin as I have a few meters around the place myself and have set a bunch up so you don't have to keep moving the leads around,,, Glad you enjoyed this my friend.
Great video, thank you! One question, how would you calculate the wattage for the resistors needed to use this divider for a circuit pulling 14vdc 4 amps?
KISS, but the rezisterds seem kinda too much? but for a chip, a battery is kewl. I liked that gizmo George demoed, use an old pc ps for bs, bench supply.
Yes you can Nigel. In a circuit that is using the pos and neg voltage, you may need to go to ground and so you could tap off where the two come together for the virtual ground and use that. Thanks as always pal.
Hello, thanks for sharing! I was looking for something easy like this for op-amps. I'd like to ask you if this is a voltage divider, or better, a voltage partitor? The two resistors in series between the positive and negative input, are consuming power and becoming hot? I don't understand how they don't short the circuit! (are they 1W resistors?)
Hey Fada, I was using half watt resistors and I used them for the split 9 volt, ( 4.5 pos and 4.5 neg ) like on the video, and I have ran 18 volts split using two 9 volt batteries and my power supply. Can't right off say what my amps were but they were strong enough to drive the op amp and I did not have any problems with the resistors overheating. I understand your concern as I had the same questions about this when I first started studying this, but the half watt 10k ohm resistors did the trick. Bread board this out and give it a try. Check out the resistors and see if they get warm. Then, you may want to try a quarter watt set of resistors and see if they get too hot. All the best with your experiments. ps,,, notice that there should be a virtual ground line coming off the split. You will need that for your grounds in the rest of the circuit.
Sorry, I forgot to mention that yes, it is a voltage divider. That is why you must pay attention to the values of the resistors as they should be equal.
Hey Koushiro, Good point. I don't see why that wouldn't work. You probably would want to monitor the amperage but that could be trimmed down. Thanks so much.
@@skycarl For example, in my PC i have a power supply that can go up to 62 amps on the 12 volt rail. That would make for plenty of headroom (that is if i had two more to power an audio amp). Regular (aka CHEAPO) psu are far weaker with less headroom for adjustment. Dedicated supplies with negative voltage seem quite expensive, why?
Thank you for this. It is incredibly useful for people that only have one simple power supply.
Thank you Carl! this is extremely helpful for people like me with a single power supply only.
I am one of those people that did not know this trick. Saved me buying a dual power supply. THANKS!!! Keep sharing.
So glad to hear it helped David.
thank you so much Carl! This was of a great help for my assignment in school. Love the clarity and energy you bring to the video, much appreciated.
So glad to hear this helped you in your studies. Have a great day pal.
Thanks for adding the schematic at the end, Carl. Useful circuit.
Yeah it dawned on me that I didn't show the actual circuit and put that together at the end. Thanks as always and take care.
Thanks for giving this idea for my research......... and i would like your class thanks sir........please send your contact number in this email sir......
By
Anil Chandran(india)
Thanks so much for your help. Just what I needed.
Nice build Carl. Glad to see another video.
All my best.
Bobby
Hey Bobby,,, great to see you pal,,, thought you fell off the planet there for a bit lol. Thanks so much.
@@skycarl Hi Carl. Lol Sometimes I feel that way : ) My email provider sends me the spam and puts the emails I want you guessed it in the spam. This has gotten worst this year. It gets me behind and then I have less time to comment. So Know that I do watch ,Like Share and add to Playlists. And I try to give everyone one a thumbs up in the comments I am the little guy behind the curtain so to speak : ) So just remember when you see comments with a thumbs up,9 times out of 10 I have been there.
All my best buddy.
Bobby
hay Bobby, wassshappening? goot to see ya! many tubers split like a banana, like that Tim Chad Bob and Chris who hide on fb now.?
hey check out that Laura Loomer on the "wall", good stuff.
Don
CARL THE GOAT, thank you for this video. It is exactly what I need for my school projects.
Good video. You do have to keep the impedance of the load in mind because it'll throw off your voltage divider, and you have to be careful about your signal because your - rail is still tied to earth ground unless you have the power supply isolated
Yeah, a future video with this powering a circuit, showing the different readings through the circuit would be a good idea. It would show what's going on and what to expect. Thanks as always.
Nice video Carl. Looking forward to watching your transmitter video in the future. Keep experimenting, it keeps the brain alive. 👍👏🏻
Thanks bud,,, yeah and I need something to shake my old brain to keep it awake lol.
Thanks for the tip Carl. I've come across this issue like you mentioned with Op Amp circuits. I don't have a supply that has a negative source either. I think I have taken two 9 volt batteries in series in the past, and made the junction where they connect together the virtual ground and it did give me the +9v & -9v. But the circuit you showed there with the 2 resistors would be good for use with the power supply.
It's funny Pete but I was doing the very same set up with two 9v batteries when I thought of doing this video. I had used this setup before so I went from there. Thanks so much.
Thank's, Carl, for provoking thought - which needed to be considered. I've taken the three 'el cheapo lab-grade power supplies' for granted, as tools, and only as tools. I've been messing with a Mitel SX50 Phone Trunking Board, which has a -11.4v reference voltage required, to notify another circuit - on another board, that a "ground-start call notification" has been received, it's the system that the PBX design uses to transfer calls between subsystems. It's been driving me nutz, because the system will not recognize two important extensions on what I thought was a failed trunk, which actually may be a poor connection causing me to lose reference voltage, where I've been blaming "rotten refurbished boards". I'll dig into it tomorrow, thanks Carl
Always a pleasure to help Tim. I knew you was going to get that hidden message of a solution to that problem. Problem today is nobody is psychic anymore so what can one do.
Always good to hear from you my friend.
ps,, hope all is going okay with the DC-3 investigation.
for a second, I thought that I saw el Chapo, far from el cheapo, to the tune of billions of dope $ that can be used to build a wall, lol.
Nice easy solution Carl, thanks for making the video. Regards, Dave
Thanks Dave,,, yeah easy is always the best route for me lol.
That's really good info to know Carl! Thanks for sharing! BTW - I really like the FZ "I love loosely rendition" at the end of your vids!
Thanks Bob,,, very cool you caught that in the end, I did cut off the Woody Woodpecker riff right after it. Didn't want to push my luck lol.
Thanks for the video Carl, good information.
Thanks Bill,,,, very glad you enjoyed it my friend.
Excellent tip. Keep up with the good work ;) subscribed for sure
Thanks h2o,,, much appreciated.
Thanks a lot! I didn’t know about this method but this is actually what I needed
You're welcome Natan. Very glad to hear it helped.
Thank you Mr. Carl.
Thank you Tadeh. Glad you enjoyed it.
Thats great Carl. I see a meter in your video I don't have... hmmmmmm.... should I add it to my collection ? LOL Good stuff my friend, I learned something valuable here. Thank you !! Ron
Thanks Ron,,, yeah buddy they are a pretty nice meter. I've had it for several years now and it's worked very well for me. I have to grin as I have a few meters around the place myself and have set a bunch up so you don't have to keep moving the leads around,,, Glad you enjoyed this my friend.
Good to see you Carl. Take care buddy.
Thanks Ron,,,, I'm hanging in there by golly. ☺
Thanks Carl! Great tip! 👍👍
Thanks Bob,, yeah as we know getting the power we need is an important factor in our hobby.
Great information will be very useful!!!
Thanks much Stan,,, always appreciated buddy.
Thanks very much for sharing, it was very helpful
thank you Sir. it was a big help!
Very glad to hear that.
Carl,
I have never heard the term "Virtual Ground". Shows you what I know. Good vid, my friend.
Regards,
John
Thanks John,,, yeah that stuff comes with living in the Virtual World.,,, oh excuse me,, a robot is knocking at the door.,,,☺
Thank you sir. Very helpful!
That's great. Thanks
Interesting tip
Hey JD,, yeah, hope it can help some. Thanks so much.
thank you sir.
THANK YOU
Great video, thank you! One question, how would you calculate the wattage for the resistors needed to use this divider for a circuit pulling 14vdc 4 amps?
it's good but we have voltage drop when add Rload
KISS, but the rezisterds seem kinda too much? but for a chip, a battery is kewl.
I liked that gizmo George demoed, use an old pc ps for bs, bench supply.
Yeah Don I didn't go into the current readings and all. That would make for a video up the road perhaps. Thanks pal.
I have 24 v 100a supply from two 12v battery in series.. I want -24 . So what's the value of resistor??
Doesn't the voltage dip lower to different values when you place it under the load of active components?
Very interesting, never thought of this! Do you ever need to ground the midpoint, so it's at zero volts?
Yes you can Nigel. In a circuit that is using the pos and neg voltage, you may need to go to ground and so you could tap off where the two come together for the virtual ground and use that.
Thanks as always pal.
@@skycarl thank you! Very informative video.
Hello, thanks for sharing!
I was looking for something easy like this for op-amps.
I'd like to ask you if this is a voltage divider, or better, a voltage partitor?
The two resistors in series between the positive and negative input, are consuming power and becoming hot?
I don't understand how they don't short the circuit!
(are they 1W resistors?)
Hey Fada, I was using half watt resistors and I used them for the split 9 volt, ( 4.5 pos and 4.5 neg ) like on the video, and I have ran 18 volts split using two 9 volt batteries and my power supply. Can't right off say what my amps were but they were strong enough to drive the op amp and I did not have any problems with the resistors overheating.
I understand your concern as I had the same questions about this when I first started studying this, but the half watt 10k ohm resistors did the trick.
Bread board this out and give it a try. Check out the resistors and see if they get warm. Then, you may want to try a quarter watt set of resistors and see if they get too hot. All the best with your experiments.
ps,,, notice that there should be a virtual ground line coming off the split. You will need that for your grounds in the rest of the circuit.
Sorry, I forgot to mention that yes, it is a voltage divider. That is why you must pay attention to the values of the resistors as they should be equal.
Hey Carl, would it be possible to do this with two computer power supplies, since those have pretty potent 12 volt rails?
Hey Koushiro, Good point. I don't see why that wouldn't work. You probably would want to monitor the amperage but that could be trimmed down. Thanks so much.
@@skycarl For example, in my PC i have a power supply that can go up to 62 amps on the 12 volt rail. That would make for plenty of headroom (that is if i had two more to power an audio amp). Regular (aka CHEAPO) psu are far weaker with less headroom for adjustment. Dedicated supplies with negative voltage seem quite expensive, why?
ATX power supplies have both +12v and -12v already.
@@gugenet I think he was wondering if you could split that 12v pos rail on a breadboard. For experimental purposes. Good mention though. Thanks.
@@gugenet Yes they do have +12 and -12 but the -12 is separated from +12 (dedicated ) and very low power
Awesome 👌