USB Charger Circuit

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PARTS LIST FOR THIS VIDEO:
* 120V-12V AC Transformer: amzn.to/2YMKY84
* 1N4002 diodes: amzn.to/2Kz2pjT
* LM7805 regulator: amzn.to/2KIrt6F
* Regulator heatsink: amzn.to/31ABFVF
* Electrolytic caps: amzn.to/31ArDE3
* Ceramic caps: amzn.to/31Bpsjr
* Breadboards: amzn.to/2Ky56Ss
* Breadboard wires: amzn.to/2YO011l
* USB cable: amzn.to/2H4NVpH
* Siglent SDS1104X-E: amzn.to/31aS0QO
Detailed article here:
www.thegeekpub.com/243431/bui...
In this video we will build a USB charger circuit that can be used to power all of your USB devices. This circuit is based on a transformer, full wave rectifier, capacitors, and an 5V voltage regulator.
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[@battra92]

Not a puny single diode rectifier but a FULL BRIDGE RECTIFIER!

[@marcelofrau8818]

Ah I See You're a Man of Culture as Well

[@dabidoHUN]

Unibrow wave intensifies!

[@TheGeekPub]

I see we have some ElectroBOOM followers in these here comments!

[@TheGeekPub]

Learn how to build this awesome USB charger circuit that can be used to power all of your USB devices. It is important to note that this is not the most efficient charging circuit that you can build for USB devices. As a matter of fact there is basically a single chip with a few inputs and outputs that will do all of this for you with just a few wires. And much more efficiently. The problem is that doesn’t make a very good teaching tutorial. As a matter of fact it’s basically magic. And so with this we can discover each individual step of converting AC high voltage down to a regulated 5V DC that your USB devices can use. So that’s the reason that I chose this method.

[@cuteswan]

...and then there's usually a chip inside each device itself to handle the trickier parts - current regulation and timing - for the battery itself. Dave Jones of EEVBlog did "an exercise" (or just didn't want to have to buy _yet another_ battery charger) showing the various steps used to recharge batteries using a bench power supply: Unlike car batteries, Li-ion and even the others involve a complex little ritual to ensure maximum safety, efficiency, and lifetime. kzbin.info/www/bejne/oH_Qnat4jaqkjZI BTW too bad Jones is in Australia because I think you, he, and another Dave we all know & love would have a blast hanging out; and no doubt your brother could probably get a lot of insight as he develops his 8-bit dream project. Thanks for another good starter tutorial, and more so for leaving in the part where the magic blue smoke made a run for it.

[@Zerkbern]

Thanks! Some of us really appreciate down-to-basics vids!

[@TheGeekPub]

Thanks, that's exactly what I am going for with this latest batch. Basics!

[@jackjohnson5426]

I really love your videos. I wish you released them more often!

[@bwack]

Nice instructional video. I like the use of illustration her. Very easy to follow !

[@stevenA44]

I was thinking that I needed something along this same project. I'll have to bookmark it. Thanks.

[@marcelofrau8818]

Great video Mike! Very easy to follow and understand how to do it properly.. You should say FULL BRIDGE RECTIFIER with more enthusiasm otherwise ElectroBOOM will be sad.. Thank you for the great content

[@shawnparker7]

Great video, Mike! Very informative! I'm looking forward to more woodworking project videos.

[@TheGeekPub]

My next project will have woodworking in it!

[@jagardina]

Nicely presented for a new student. I would recommend your videos to young people to learn about tech. Thanks.

[@Anomalouzs]

Thanks for properly showing step by step what each part is and what is does. If you can also include how those components work that would be great, such as what materials the components used to make those filtration or oscillation effects work.

[@titaniumdiveknife]

Nicely played, sir. Nicely nicely.

[@maxpowersam]

It’s important to note that this type of circuit will not fast charge many modern devices. Devices that can draw a higher current look on the USB data lines to see if the charger is compatible with a high load, and if they don’t see the appropriate voltage on those data lines, they will only charge at a slow rate. More info here: www.epanorama.net/newepa/2010/08/18/apple-charger-secrets/

[@TheGeekPub]

That's correct. Any type of device that queries the charger will see this as a slow charge device, but it will still charge unless it *requires* fast charging.

[@ReggieCotton]

I built a USB charger circuit *very* similar to this to power a Raspberry Pi in my arcade cabinet. It works like a charm.

[@BilalHeuser1]

Very interesting video, but it would be nice to have more detailed video on how power supplies work in general, their different types, and advantages/disadvantages of each.

[@MrGeekGamer]

I've seen people using caps around the voltage regulator, but I've never seemed to need them. I built something similar a while back, but I just used a smoothing capacitor after the bridge rectifier and it worked just fine. The scope showed a nice, stable 5v output.

[@kimpearson5465]

Before or after can work. Both is much better. If there is a line problem before the regulator such as a quick under-voltage, a cap before will save the day.

[@Celcius1]

and in other parts of the world, step down the voltage from 220 - 240v AC, if you want to expand on this, look at showing a SMPS, both low amps and high amps version, the concept is easy, but the high current ones are challenging, currently build a custom SMPS for my 3D printer, so I can save some space and get an ATX style power button on it

[@AxelWerner]

Linear power supply is a inefficient and therefore a thing of the past. Especially on high currents.

[@sacuna3333]

You’re a great teacher! Keep it up

[@jj74qformerlyjailbreak3]

Now this is my style of teaching. Or learning. 😂

[@jasonlee3247]

Yes but does it have onboard WiFi?

[@TheGeekPub]

My secret. I'll never tell!

[@jasonlee3247]

TheGeekPub I do enjoy yours and David’s videos, did you ever finish that Star Wars robot?

[@TheGeekPub]

Still slowly working on it.

[@chriswatson2407]

Magic

[@TheGeekPub]

Oh oh oh its Magic! You know!!!!

[@hugocardozo8685]

ElectroBOOM-like moment at 00:58 xD

[@hugocardozo8685]

And great idea too! Even if it isn't the most efficient charger, it will be still a fun DIY project

[@aeros5678]

I would like to see the waveform after a buck converter.

[@aeros5678]

@@Anomalouzs keep it professional. With what you just said you have a mind and mentality of 9 year old.

[@Anomalouzs]

@@aeros5678 Your mom cried afterward too you little bitch.

[@tepitokura]

Thanks for sharing. Folks like you make a better world.

[@paule6101]

Is there a reason you went with the full bridge rectifier rather than using the center tap and just two diodes? Thanks

[@TheGeekPub]

Just for a teaching exercise. As not all transformers have a CT.

[@paule6101]

@@TheGeekPub thanks

[@therealmrsketch]

Just a quick Question for chargers. I'm building a 9V battery iPhone charger and I want to use a usb connector as the output. Since I'm doing it from scratch, I'm building all the parts myself. One USB connector in particular has a VCC and GND pin but it also has a D+ and D- as well as SHELL pins. What do these mean and I'm wondering if I should just ground the data pins if its just for a charger.

[@AbdulHadi-wl8ek]

hello sir, can u please tell us the name of the components along with their specifications used in the circuit

[@fringeanomaly9284]

I am only getting 0.03-0.04 V after connecting a multimeter to the end of diodes what could be the reason?

[@Zenoc2]

This video's music is extremely familiar, but I can't place it! What is the name of this track?

[@N2tech]

0:35 The outlet says it's a GFCI outlet but I don't see the test and reset switch. Does it just kick the breaker?

[@TheGeekPub]

Yep! You're quite observant! All of the GFCI's in my house are central in the breaker panel. Pretty common for new construction where I live.

[@richard1113]

@@TheGeekPub Apart from the sticker, is there any way to know if the outlet is GFCI protected at the panel? I recently noticed that my mom's downstairs kitchen and bath seem to have regular outlets. I don't know if this is shoddy workmanship or I'm overlooking something.

[@TheGeekPub]

You can buy a tester on amazon for just a few bucks: amzn.to/2N55edR

[@tobyminerBTC]

@@TheGeekPub Hey I have that exact tester!

[@luke-alex]

2:08 That's an _interesting_ waveform...

[@TheGeekPub]

LOL. PowerPoint is never perfect for this type of stuff. But I think it gets the point across well enough.

[@LakhsTsoyknikas]

[@leebirchenough8890]

are u related to the 8-bit guy?

[@davidsphone8449]

What 'system on a chip' would you recommend? What US supplier would you use? Reference kzbin.info/www/bejne/eIO9kGmom9Rmg5o (Magic Chip) Thank You for sharing your time and talent. Aloha

[@matthewlewis5631]

There are some things you should DIY, and some things you shoulda just buy. 1,000,000 times you should just buy this.

[@TheGeekPub]

This video is about learning, and education. Not saving money. :-(

[@peterrasmussen2384]

Never step so many volts down. The 7805 have to burn so much energy of.

[@TheGeekPub]

The specs on the LM7805 is 8-25v input. Its perfectly safe and reliable with a heatsink. It just uses more energy.

[@peterrasmussen2384]

@@TheGeekPub exatly, waste of energy.

[@robclaggy8620]

@Peter Rasmussen This design is perfectly within spec. I also think you missed three important parts of this video. 1) Explaining how AC to DC conversion works, 2) Its a prototype only, and 3) The dude flat out said at the end that it wasn't efficient and there are better components and ways of doing this.