Voltage Regulators: Breadboarding a DIY USB Power Supply
Monday, December 17th, 2007 running time 10:28
Today we turn a 7805 Voltage Regulator and 4 AA batteries into a very simple Power Supply to charge anything that runs off USB. Breadboarding circuits are fun!
Sure, you can drop $20 on a perfectly good Energi To Go USB charger from Energizer.
But we were looking for an excuse to play with a basic +5V 7805 Voltage Regulator we saw for $1.59 at our local Radio Shack
So we grabbed our trusty breadboard, a 4 AA battery holder, some wire, and liberated a femail USB plug from a USB extender cable.
The nice thing about recycling USB cables for a power supply: just look for the black (-) and red (+) wires when you split the cable open.
While we're at it, we briefly talk about Linear Voltage Regultors (like the 7805) which act like a variable resistors, tend to heat up, and can only reduce voltage vs. Stepping Voltage Regulators, which turn off and on to regulate voltage, are super efficient, generate less heat, and can raise or lower voltage.
Did I say we? David's off building the studio this week, and Brendan's locked in a server closet.
Got a project idea or a question? Email us: systm@revision3.com
Highlights
side effect
(
10:19, 10:19
)
USB connector
(
0:33, 6:45, 9:38, 0:33, 6:45, 9:38
)
rechargeable batteries
(
8:05, 8:05
)
Power Supply
(
0:27, 0:27
)
side effect
(
10:19, 10:19
)
USB connector
(
0:33, 6:45, 9:38, 0:33, 6:45, 9:38
)
rechargeable batteries
(
8:05, 8:05
)
Power Supply
(
0:27, 0:27
)
Automatically Generated Transcript(may not be 100% accurate) ( more )
" I'm Patrick Norton all this system episode thirty we're gonna do something a little fun little base in this one brand also working furiously in the studio Brennan's. Well trapped in a dark -- a lot of servers and Glenn was last seen in Arizona. Heading north of bomb site whenever that was all that must be Marty thing we're gonna talk about two things today. Voltage regulators which going to talk a little voltage regulator is in the second and -- boarding out circuits we gonna put borders circuit hear that actually does five volts USB power. -- can actually create your own power supply for yourself alone. Your iPod are pretty much anything you can power off of five adults from USB connector now that commercial products that do this is really fun and one more thing we're gonna cover is. The two minute drill which is basically grafting USB ports -- of sacrificing cable. On two people volts car socket cell phone adapter the trick of course is fine on this bibles out. I'm -- Norton will in the system."
" There's a political system has brought by -- Netflix and trade dot com."
" But I have here he sent me. 85 voltage regulator if you plus five volts DC out in this and and be the simple circuit on the planet you can get fancy and start putting in and dvds and switches. And lights in capacitor is and resisters but the truth is is basically need one of these. A couple of wires. And power source and the power source community -- and say six -- too much of the legal global lead acid battery which can also be confused with this planet comes in your car. I want that we want to talk about for Linear power regulators like this one is this is the fabulous. Of sadness Tito wooten twenty DOT when he package. Which is mostly heat -- There's a reason you care about that because if you don't put heat sink on this of some type space and how much. Joost you ran into that you -- in the generated a lot of heat at the component to be a problem if you put it someplace like inside of the tin can in and out points. Or in some part of your car -- heat from the heat -- to do things like not plastic. So one of these you might want to think about -- only switching regulator for this which essentially has the bio data circuitry inside the chip. That allows it to you instead of -- awful lot of energy through heat. Switch back and forth control the currents and for the doubly majors out there I expect reforms in the emails to correct my limited understanding of switching. Regulators but the biggest thing want to talk about there. Is that they are more efficient they're also more expensive and -- probably gonna be mail ordered 11 of my favorite sources -- Crandall's favorite sources. The fabulous did you -- catalogue which is available on line. One of the reasons this project is so much fun and so easy -- agree interaction bread boring is because it's. Not as simple as you can get to build a circuit you got the regulator there's three -- on the regulator. The first -- the voltage and put the second and is the ground and the third and it's the five volt voltage output which basically means you connected battery -- You connect your return from your external device your power turn to the ground pin or TV circuit on the ground and has backed the negative view battery source. And a positive -- the positive outlook. So what were -- right here we've."
" At a little pretends and we got a classic you know bread board from our local RadioShack. And knows how plugging it in here and -- one of the print reporters which concluding components. And wire them in there. And they created -- that doing in there and it's kind of fun when you do this because you plug it -- right. And you'll notice there's rose. Of pins on here and all of these animals right here basically connected to that in in and that I see. So we're gonna plug in in there and that's essentially connecting to that little link on the -- and -- want to plug into another component packages boom. Plug it in two in other hole on the purport. Right to take a look we've got our little voltage record in there remember senator penis or ground. Our pin over here is or voltage in -- and overhears or by pulled out so let's go ahead and next. The USB cable and community something. Only a little bit low -- here and -- my electrical tape. Don't keep this from falling off but keep courts can be yanked out tying the knot in them is incredibly useful. Soon. My fabulous. Don't yank it off the side of the print -- not. And that's electrical tape here. Yeah so. That are negative return here in black is going to go to the senator Kent. -- And if you find playing these into the -- to be really helpful to have a little pair of even those players. He's around the -- ones are especially wonderful because. They tend not to. Damage things they sharp edge. It's got a USB cable connected. It's -- samples that's convenient. So we're gonna. Take our -- most of these -- nine volt battery for this like he's in double a batteries because. They're everywhere movement IC over here just for fun. And we're gonna connect this one down. With our friend the electrical tape. So we are voltage and we're gonna put that on the -- on the left. Member friend and next of that or negative return. Me on that senator Penn and again our fault. -- house has on the -- all the way on the right and there we just reported in very simple circuit there's a very simple way to see if it's working. Two things we can do we can played in a couple of extra wires. A couple of jumpers here. And -- for her negative."
" And that's for negative ones from the -- to. Rid would be positive. Isn't that -- My long suffering flu. All right we got that on he she voltage. Like using clips for these -- teasing trying to hold them in place. That's positive -- negative."
" And check that out so we've got six Fulton from -- double A batteries and we've got five volts now. So Barack five point two Walters Matt actually get running USB connector four point it is about the minimum. If your batteries are running down the voltage on the output is gonna drop this country work to charge your device -- more can't tell you right that was using these six faulty input."
" They get all fancy and connect -- twelve false alarm battery over here. And -- it's complete view. The red. And the return. More ground and or negative. And they can hear the W majoring in as we speaks now I've got twelve Walton put. And check it -- still five volts output that's voltage regulation. Exciting now he's gonna pull out one at max. It's gonna take a pretty hefty USB -- much more than. And hey you know we gotta load on and so. And yes. Our little voltage regulators empowering our USB --"
" So. This pretty you want unions -- step down global society car want to put USB Jack you dashboard power things. He needs to power USB telephones. If you want to see the fancy way of doing it energizer makes a pretty USB charger. That steps up from three volts. And a you refundable partner cellphone chargers that are being sold all over the place about twenty bucks these and a pair of rechargeable batteries unbelievably useful tree -- when you're traveling. Can't find the socket but it's a really nice little assembly and also can give you 94. Pretty this is stepping regulators. These super clean circuit layout."
" Soon -- fancy. That what's been able to treat nations that. Return my poor little. Adapter that there it's a fun project it's great when you start with you want something really simple do you use it for a lot of things. Like charging your iPod. -- yourself on this could -- anything wrong all of any. You're speechless. Where did you actually think about this you can find an old phone cord that has five volt output which is. Easy to figure out with a multi gesture you can actually. You can actually build one and two other really fast. Out of an old phone charger corporate. So lets you put together. Basically you're looking up -- Or cell phone power adapters in there you just -- the phone actually has five volts output -- Poland off which should be. To be -- loss but that's another good way to sort. Five -- or any kind of -- need for the input on that. Easy projects simple project you some time with Fred boarding pass to prepare you for some stuff for him later on in 2008 we're gonna need to regulate -- playing with. And hand them one more thing -- its four pins on the USB connector. And it's pretty critical make sure you're the wiring on that one inside USB cable here's a red. Basically -- positive black or grounder negative. When you're actually looking at the cable itself the first and is plus five volts and the fourth -- if -- ground and and if you keep that right which should be pretty easy because here he's in the cabling issues of red black -- often motherboard. Just make sure you get the Apple systems and -- it. We're gonna see David a couple of weeks coming up next we got an amazing tour after Christmas holidays looking dance the wired. Home but it was pretty cool stuff with renewable energy and some pretty -- appliances and monetization side effect Clinton particularly that. And 2000 and movies and stuff if you -- don't want to."
" I'm Patrick Norton all this system episode thirty we're gonna do something a little fun little base in this one brand also working furiously in the studio Brennan's. Well trapped in a dark -- a lot of servers and Glenn was last seen in Arizona. Heading north of bomb site whenever that was all that must be Marty thing we're gonna talk about two things today. Voltage regulators which going to talk a little voltage regulator is in the second and -- boarding out circuits we gonna put borders circuit hear that actually does five volts USB power. -- can actually create your own power supply for yourself alone. Your iPod are pretty much anything you can power off of five adults from USB connector now that commercial products that do this is really fun and one more thing we're gonna cover is. The two minute drill which is basically grafting USB ports -- of sacrificing cable. On two people volts car socket cell phone adapter the trick of course is fine on this bibles out. I'm -- Norton will in the system."
" There's a political system has brought by -- Netflix and trade dot com."
" But I have here he sent me. 85 voltage regulator if you plus five volts DC out in this and and be the simple circuit on the planet you can get fancy and start putting in and dvds and switches. And lights in capacitor is and resisters but the truth is is basically need one of these. A couple of wires. And power source and the power source community -- and say six -- too much of the legal global lead acid battery which can also be confused with this planet comes in your car. I want that we want to talk about for Linear power regulators like this one is this is the fabulous. Of sadness Tito wooten twenty DOT when he package. Which is mostly heat -- There's a reason you care about that because if you don't put heat sink on this of some type space and how much. Joost you ran into that you -- in the generated a lot of heat at the component to be a problem if you put it someplace like inside of the tin can in and out points. Or in some part of your car -- heat from the heat -- to do things like not plastic. So one of these you might want to think about -- only switching regulator for this which essentially has the bio data circuitry inside the chip. That allows it to you instead of -- awful lot of energy through heat. Switch back and forth control the currents and for the doubly majors out there I expect reforms in the emails to correct my limited understanding of switching. Regulators but the biggest thing want to talk about there. Is that they are more efficient they're also more expensive and -- probably gonna be mail ordered 11 of my favorite sources -- Crandall's favorite sources. The fabulous did you -- catalogue which is available on line. One of the reasons this project is so much fun and so easy -- agree interaction bread boring is because it's. Not as simple as you can get to build a circuit you got the regulator there's three -- on the regulator. The first -- the voltage and put the second and is the ground and the third and it's the five volt voltage output which basically means you connected battery -- You connect your return from your external device your power turn to the ground pin or TV circuit on the ground and has backed the negative view battery source. And a positive -- the positive outlook. So what were -- right here we've."
" At a little pretends and we got a classic you know bread board from our local RadioShack. And knows how plugging it in here and -- one of the print reporters which concluding components. And wire them in there. And they created -- that doing in there and it's kind of fun when you do this because you plug it -- right. And you'll notice there's rose. Of pins on here and all of these animals right here basically connected to that in in and that I see. So we're gonna plug in in there and that's essentially connecting to that little link on the -- and -- want to plug into another component packages boom. Plug it in two in other hole on the purport. Right to take a look we've got our little voltage record in there remember senator penis or ground. Our pin over here is or voltage in -- and overhears or by pulled out so let's go ahead and next. The USB cable and community something. Only a little bit low -- here and -- my electrical tape. Don't keep this from falling off but keep courts can be yanked out tying the knot in them is incredibly useful. Soon. My fabulous. Don't yank it off the side of the print -- not. And that's electrical tape here. Yeah so. That are negative return here in black is going to go to the senator Kent. -- And if you find playing these into the -- to be really helpful to have a little pair of even those players. He's around the -- ones are especially wonderful because. They tend not to. Damage things they sharp edge. It's got a USB cable connected. It's -- samples that's convenient. So we're gonna. Take our -- most of these -- nine volt battery for this like he's in double a batteries because. They're everywhere movement IC over here just for fun. And we're gonna connect this one down. With our friend the electrical tape. So we are voltage and we're gonna put that on the -- on the left. Member friend and next of that or negative return. Me on that senator Penn and again our fault. -- house has on the -- all the way on the right and there we just reported in very simple circuit there's a very simple way to see if it's working. Two things we can do we can played in a couple of extra wires. A couple of jumpers here. And -- for her negative."
" And that's for negative ones from the -- to. Rid would be positive. Isn't that -- My long suffering flu. All right we got that on he she voltage. Like using clips for these -- teasing trying to hold them in place. That's positive -- negative."
" And check that out so we've got six Fulton from -- double A batteries and we've got five volts now. So Barack five point two Walters Matt actually get running USB connector four point it is about the minimum. If your batteries are running down the voltage on the output is gonna drop this country work to charge your device -- more can't tell you right that was using these six faulty input."
" They get all fancy and connect -- twelve false alarm battery over here. And -- it's complete view. The red. And the return. More ground and or negative. And they can hear the W majoring in as we speaks now I've got twelve Walton put. And check it -- still five volts output that's voltage regulation. Exciting now he's gonna pull out one at max. It's gonna take a pretty hefty USB -- much more than. And hey you know we gotta load on and so. And yes. Our little voltage regulators empowering our USB --"
" So. This pretty you want unions -- step down global society car want to put USB Jack you dashboard power things. He needs to power USB telephones. If you want to see the fancy way of doing it energizer makes a pretty USB charger. That steps up from three volts. And a you refundable partner cellphone chargers that are being sold all over the place about twenty bucks these and a pair of rechargeable batteries unbelievably useful tree -- when you're traveling. Can't find the socket but it's a really nice little assembly and also can give you 94. Pretty this is stepping regulators. These super clean circuit layout."
" Soon -- fancy. That what's been able to treat nations that. Return my poor little. Adapter that there it's a fun project it's great when you start with you want something really simple do you use it for a lot of things. Like charging your iPod. -- yourself on this could -- anything wrong all of any. You're speechless. Where did you actually think about this you can find an old phone cord that has five volt output which is. Easy to figure out with a multi gesture you can actually. You can actually build one and two other really fast. Out of an old phone charger corporate. So lets you put together. Basically you're looking up -- Or cell phone power adapters in there you just -- the phone actually has five volts output -- Poland off which should be. To be -- loss but that's another good way to sort. Five -- or any kind of -- need for the input on that. Easy projects simple project you some time with Fred boarding pass to prepare you for some stuff for him later on in 2008 we're gonna need to regulate -- playing with. And hand them one more thing -- its four pins on the USB connector. And it's pretty critical make sure you're the wiring on that one inside USB cable here's a red. Basically -- positive black or grounder negative. When you're actually looking at the cable itself the first and is plus five volts and the fourth -- if -- ground and and if you keep that right which should be pretty easy because here he's in the cabling issues of red black -- often motherboard. Just make sure you get the Apple systems and -- it. We're gonna see David a couple of weeks coming up next we got an amazing tour after Christmas holidays looking dance the wired. Home but it was pretty cool stuff with renewable energy and some pretty -- appliances and monetization side effect Clinton particularly that. And 2000 and movies and stuff if you -- don't want to."










