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Power For Your Electronics Projects - Voltage Regulators and Converters


DroneBot Workshop
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Learn about voltage regulators and buck converters that you can use to power up your electronic projects.

Full article at https://dbot.ws/pwrvolt

Today we are going to look at the somewhat mundane but absolutely essential subject of supplying power for your electronic projects. Trust me, this stuff is important!

Electronic devices typically require either 5 or 3.3 volts, sometimes both. Other common voltage requirements include 6 and 12 volts for motors and displays. Some complex designs (ie. a robot) require several different supplies with different current capabilities.

When you build your latest robot or IoT device you’ll need to consider how you'll supply these voltages in the real world. On the workbench you can use a bench power supply if you have one, a USB adapter, or even the USB port on a computer (just like with the Arduino).

But when your creation needs to exist on its own with a line-powered or battery power supply you’ll need to figure out how to get all of those voltages delivered to your components, preferably easily and inexpensively.

I have nine, yes nine methods of doing exactly that. Today I’ll show you a number of different voltage regulators and converters ranging from the classic 7805 3-pin voltage regulator to a tiny device that can supply a steady 5 volts even when your battery is about to die.

Check out the following Table of Contents to skip ahead to the power supply solution of your choice. Or just sit back and enjoy the show.

INTRO

00:00 - Introduction
03:00 - Breadboard power supply module
06:28 - Power Supply Basics

LINEAR REGULATORS

11:42 - LM7805 - 5 Volt linear regulator
14:32 - LM317 - Variable linear regulator
17:52 - PSM-165 - 3.3 Volt linear regulator module
19:47 - AMS1117 - 5 Volt linear regulator module
21:43 - L4931CZ33-AP - 3.3 volt low voltage-drop regulator

VOLTAGE CONVERTERS

23:51 - Buck Converter Intro
24:41 - MINI-360 - Variable buck converter
26:46 - Boost Converter Intro
27:37 - PSM-205 - USB boost converter
29.07 - MT3608 - Variable boost converter
31:06- Buck Boost Converter Intro
33:06 - S9V11F5 - 5 Volt buck boost converter

That last module is the one I was referring to earlier, it really is an amazing device and is perfect for your battery-powered projects.

As with all of my videos, there is an article at https://dbot.ws/pwrvolt

Now go power something up!

"Never trust a computer you can’t throw out a window." — Steve Wozniak


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Sumanta
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One of the best videos in this channel. 😎 


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jfabernathy
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Posted by: @sumanta

One of the best videos in this channel. 😎 

Thanks for pointing this out.  It was a good refresher and, for me,  an education on some new stuff. 

If your code won't compile, have another glass of bourbon. Eventual the problem will be solved.


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Sumanta
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@jfabernathy

Welcome 😀 . Delighted to help you.


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FPVCurmudgeon
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I've been blabbering over in the YouTube comments and thought this might be a better forum.

I'm having trouble understanding the capacitors on the 78xx series regulator. I'm wondering if I could hook one to a scope with and w/o caps and understand their effects? I ask because, the last time I hooked up a scope was in my college EE lab and I blew a circuit breaker!

 

Are the caps used to smooth out the transistor switching? I'm still at a loss at what they use to measure the output voltage! My linear mind cannot come up with anything that isn't proportional to input voltage. Is the BEC (battery elimination circuit) referred to in RC aircraft simply linear regulator. - Cheers!


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Will
 Will
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@fpvcurmudgeon 

The regulator uses feedback to do its job, but it's not fast enough in all cases. The input capacitor provides a reserve to prevent it from going into an oscillation mode.

The output capacitor helps provide a stable output buffering the possible variations in power in as well as power demanded.

I was kidnapped by mimes.
They did unspeakable things to me.


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FPVCurmudgeon
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Thank you for the reply.  I probably understand the feedback, which seems to be the voltage across the top resister, however, w/o the magic chip, that would be a simple fraction of the input and thus proportional to it.  I'm at a loss how they come up with a reference that maps to the desired output voltage.  I'm sure this isn't clear, but that reflects my confusion.  I flunked most of my early EE classes and was rescued by E&M Field Theory, well, the math.  lol

 


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Will
 Will
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@fpvcurmudgeon 

Maybe this will describe it better than I can ...

https://www.digikey.ca/en/maker/blogs/introduction-to-linear-voltage-regulators

I was kidnapped by mimes.
They did unspeakable things to me.


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Inst-Tech
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@FPVCurmudgeon, the voltage reference in a linear voltage regulator is called a Bandgap reference..it basically consist of a Zener diode shown in the attached

 

   regards,

LouisR

 

LouisR


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FPVCurmudgeon
(@fpvcurmudgeon)
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Thank you! That will take a while to process.  Great to have kindred souls to talk about this with! May save our marriage.  😀 🤣 😆 


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FPVCurmudgeon
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@inst-tech Zenier diode, now that is a thing from my past, ran into Bode plots recently.  I recall the names but that is about all.  lol


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