DIY Boost Converter || How to Step Up DC Voltage Efficiently




Introduction: DIY Boost Converter || How to Step Up DC Voltage Efficiently

About: Awesome Electronics Tutorials, Projects and How To´s

In this project I will show you an efficient and common way how to step up DC voltages. I will also demonstrate how easy it can be to build a boost converter with the help of an ATtiny85. Let's get started!

Step 1: Watch the Video!

The video gives you all the information you need to create your own boost converter. The next steps just contain additional information for your convenience.

Step 2: Order Your Components!

Here is a list of all the parts that you need with example sellers:

1x ATtiny85:


1x 100µH Coil:

2x 47µF Capacitor:

1x 100kΩ Potentiometer:

1x 1N5819 Schottky Diode:

2x 10kΩ, 1x 1kΩ, 1x 2.2kΩ, 1x 100Ω Resistor:

2x PCB Terminal:



1x ATtiny85:


1x 100µH Coil:

2x 47µF Capacitor:

1x 100kΩ Potentiometer:

1x 1N5819 Schottky Diode:

2x 10kΩ, 1x 1kΩ, 1x 2.2kΩ, 1x 100Ω Resistor:

2x PCB Terminal:


1x ATtiny85:


1x 100µH Coil:

2x 47µF Capacitor:

1x 100kΩ Potentiometer:

1x 1N5819 Schottky Diode:

2x 10kΩ, 1x 1kΩ, 1x 2.2kΩ, 1x 100Ω Resistor:

2x PCB Terminal:


Step 3: Build the Circuit!

Here you can find the schematic for the project and reference pictures. The soldering process takes around 45 minutes if you know what you are doing.

Step 4: Upload the Code!

In order to upload the code to the ATtiny85 you can use an Arduino Uno. Here is an older video of mine in which I demonstrated how to do that:

Step 5: Success!

You did it! You just created your own Boost Converter!

Feel free to check out my YouTube channel for more awesome projects:

You can also follow me on Facebook, Twitter and Google+ for news about upcoming projects and behind the scenes information:



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107 Discussions

Could you upload hex file as well, please?

Hi there, where is the output voltage on the schematic?


Question 3 months ago

Could you please post a photo of the boost converter showing all circuit connections and components clearly? thanks in advance.

I am biggest fan of yours ..sir@Greatscott ...Sir my BE final year project is grid tie solar panels are giving around 140-160v dc@8A...and I want to boost it to 325vdc in order to convert it into 230vrms(325vp) can you please tell me how to calculate values of components like inductor and capacitor....plz help me out sir....

What is the switching frequency supposed to be? I'm measuring about 32khz driving the gate of the mosfet. That seems a little slow?

Maximum amp? I just want build a 5 amp boost buck dc-dc converter using ur circuit and lm317 (added some thing for 5amps.....) Thx

(Worry for bad English because I am from Taiwan

Out of TOPIC. Scott,( or anyone else) can you able to help me? I just want to control 5v relay with D1 mini (esp8266) so when I press the button I need to relay turn off after 1-2 seconds.(I am using Blynk app to control my D1 mini ) Sometimes when I constantly press the button D1 mini disconnects from internet and relay stays ON until resets and connects back. How I can solve this problem thank you in advance.


2 years ago

Why on Earth would anyone want to go to the trouble and expense of building this boost converter (whose parts cannot be obtained for less than $20) when a better quality module can be purchased for around $3 ??? I can get SIX (6) ready-made modules for less than the cost of the parts!!!

12 replies

Diud you do shopping around? Here in RSA the one supplier's was for an I.C. so high that I could get the same make and type of I.C. and all the components from another plus a box and vero board !!!

The title of this website is "Instructables' which tends to suggest there ought to be some "instructions" ... that was my main quibble about this project ... the DEARTH of "instruction" (along with the lack of any clearly-stated purpose or introduction). Cost is a completely secondary issue (unless it's the cost of my time that's being wasted ... and I consider that always a primary concern).

so you really take more of your o so precious time to type out a comment like this? You are a confusing person. Why not just move on and leave the comments section for information or questions

I ALWAYS shop-around (I have been an inveterate shopper-arounder for over a half-century). That's how I know that there's NO WAY (no matter how much they claim it) that you can acquire the parts to built this boost converter for less-than the $3 a ready-made module would cost (even if you have devices you can scavenge for parts ... and I have a warehouse full of them ... which I regularly scavenge for parts to build my projects) ... AND, that's not considering the outrageous cost you will pay in your time expended ... in actually finding/extracting the right parts, but also in the time spent fiddling-around trying to adjust the circuit to work with a part that's not an identical match to those specified. You may not consider your time as very valuable, but being an old codger with one-foot-in-the-grave-already, I find that every hour of my time grows in value day-by-day ... so, I'm not into wasting any of it needlessly. Besides, there are much easier (and cheaper) ways to "learn" this circuit ... worlds of online instructional materials about boost-converter circuits. And, yes, as I've already acknowledged, for me, the "thrill" of building a successful project is what has always been my primary motivation-and-reward for building electronic projects and kits ... and I agree with the point-of-view presented by many that there is no substitute for the efficacy of learning through actual "hands-on" building and experimentation ... BUT, I still hold to the opinion that trying to build such a project as the one described here (without any but the most scatter-brained and unclear directions) is a waste-of-time (even more so for a novice than for an old-hand like me) and MONEY ...

@ MickeyPop ... if you ACTUALLY believe your cost estimates are accurate (and I don't think you or anyone else here is that dumb), then you probably also believe that the Pentagon can buy a hammer for less than $400, or Trump's whole line of BS ... ha ha ha ah ah aha ha ha!

mine can drive 4 amps almost all under $20 drive around 80-300 miliAmps. - a few drive near 1 Amp - have not found any cheap that can drive that much

1 scrap toroid $0
10 ft bell wire about 10 cents
1 salvage FET -- $0
2 schotky diodes 87 cents/ each - $1.74
3 junk caps -- $0
a few spare resistors about 15 cents
vector board 54 cents worth
NET COST out of pocket -- $2.53 - that's why

99-cents (FREE shipping) ... I bought 10 of them:

Much better, more capabilities/range = $2.97 (plus modest shipping) ... I got 7 at this great price:

But using an 8 bit computer to regulate voltage ? Hard for anyone to maintain in your absence if and when it fails. You would need to supply spares. I don't mind people using op-amps instead of transistors, but I am against using Arduinos instead of 555 timers, say. Yes it is fun, but why drive in thumbtacks with sledgehammers ? Good effort though, people will replicate to see what tweaking can be done. Not enough younger people doing this anymore. My wife has a Masters, and has *never* used a soldering iron. Many people are no longer comfortable buying discrete components any more either. I was so happy to see Nixies in Tomorrowland ! Please do something with Nixies...

ya don't value education , and 'hands-on' learning?


BuffS1; you miss the point.

this is to learn how they work. also not all of the $3 modules meet any application and home made may sometimes be needed. -- only recently i needed an "isolated" supply to boost 8v to 14v.

no board could be found so i made mine. the point of instructables is teaching.

i say job well done.

a side note;

if you mount the filter cap (c1) the FET and Micro so ground paths between them are as short as possible you can often increase the efficiency by as much as 8-12 percent, though 6 percent is more likely on this simple circuit.

If your coil is a dumbbell type instead of toroid you will also reduce the EMI.

EE 50 years in electronics

>> If your coil is a dumbbell type instead of toroid you will also reduce the EMI.

Why?... Toroid is closed! Dumbbell (drum) is open...

dumbbell by their shape create a partial Faraday shield because of the way the ends couple back on each other in all directions, the best ones are the short wider relieving the ends closer together.

They do radiate some but less that the toroid. Toroids radiate 90 degrees to their center. Dumbbells couple on themselves.

Because the iron is in the center on the dumbbell the field shape is different than with the hole in the toroid. The iron in the center acts kind of like an absorber or like the "Keeper bar" on a horseshoe magnet.

ie; When you take the Keeper off a magnet it feels far stronger than when the Keeper is on the magnet. The magnetic field acts similarly here.