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Description
elektor special power supplies and batteries pdfWhatever the methods or even then financial means you have to make your circuits work, the power supply should rank high if not Number One in your considerations. The design block simply called power supply is hugely underrated both in electronics creation and repair. Yet, the PSU has enormous diversity and comes in wildly differing guises like AC DC, generator, battery (rechargeable or not), PV panel, benchtop, linear or switch mode, to mention but a
Whatever the methods or even then financial means you have to make your circuits work, the power supply should rank high if not Number One in your considerations. The design block simply called “power supply” is hugely underrated both in electronics creation and repair. Yet, the “PSU” has enormous diversity and comes in wildly differing guises like AC/DC, generator, battery (rechargeable or not), PV panel, benchtop, linear or switch-mode, to mention but a few. The output ranges are also staggering like nano-amps to kiloamps and the same for voltages.
This special covers the features and design aspects of power supplies.
Contents
Basics
-
Battery Management
What to be aware of when using (Lithium) batteries. -
Fixed-Voltage Power Supply using Linear Regulators
The best result right after batteries. -
Light Energy Harvesting
A small solar panel is used in an energy harvesting project to manage and charge four AAA cells. -
Mains Powered Adapter Design
Basic circuits and tips for transformers, rectification, filtering and stabilization. -
LM317 Soft Start
The high inrush current pulse should be avoided. -
Controllable Rectifiers
Some suggestions to keep the power loss in the linear regulator as low as possible.
Components
- Worksheet: The LM117 / LM217 / LM317 Voltage Regulators
-
Supercaps
Low voltage but lots of current… or not?
Reviews
- JOY-iT RD6006 Benchtop Power Supply Kit
- Siglent SDL1020X Programmable DC Electronic Load
Projects
-
Balcony Power Plant
DIY solar balcony = speedy payback! -
DIY LiPo Supercharger Kit
From handcrafted to mass market -
Dual-Anode MOSFET Thyristor
Faster and less wasteful than the old SCR -
Battery Juicer
Do not throw away, squeeze! -
High-Voltage Power Supply with Curve Tracer
Generate voltages up to 400 V and trace characteristics curves for valves and transistors -
High Voltage Supply for RIAA
For RIAA tube preamps and other applications. -
MicroSupply
A lab power supply for connected devices -
Phantom Power Supply using Switched Capacitors
Voltage tripler using three ICs -
The SMPS800RE Switch-Mode Supply for the Elektor Fortissimo-100
Reliable, light and affordable -
Soft Start for PSU
Be nice to your power supply – and its load -
UniLab 2
0-30 V, 3 A compact switch-mode lab power supply
Tips
- Soft Start for Step-Down Switching Regulators
- Low Loss Current Limit
- Powerbank Surprise
- A Virtual Ground
- Battery Maintainer
- Battery Pack Discharger
- Connecting Voltage Regulators in Parallel
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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4.6 ★★★★★
Based on 11 reviews
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Product Reviews
★★★★★ 4
Nice
Size: 3T-4T, Unit Count: 112
Good pull ups, it could get a little linty but it fits perfectly on my toddler. It stretches which I love. I do love how I could strap and unstrap the sides of the pull up. The designs on the pull up are cute. It holds a lot of pee and soaks it up very well. It’s comfortable on my toddler and the pee and poop doesn’t leak out of it. It is worth the money.
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Reviewed in the United States on November 18, 2025
★★★★★ 5
The Fast & the Curious- Potty Drift
Size: 5T-6T, Unit Count: 60
Who knew toddler potty training required both a PhD in fluid dynamics and Jedi mind tricks? These Pull-Ups prove the science part: leak-proof, absorbent, and surprisingly soft. The toddler-psychology part? That’s a battle of wills.
Our little one was a die-hard fan of Huggies diapers—too loyal, in fact. We begged, we bribed, we pleaded: “Please, let’s move on!” Resistance was fierce. So we went stealth mode, sneaking Pull-Ups on at night like parents on a covert mission.
Credit to mom—she cracked the code and finally got the kid interested in the toilet. Suddenly, the “potty rush” moments became less of a flood and more of a sprint. Diapers were too slow to peel off; Pull-Ups gave our little sprinter the speed boost they needed.
They’re soft, rash-free, and practically leak-proof (unlike that other brand we don’t speak of). Pro tip: size up for easier toddler self-removal.
The result? A drier, happier kid, less laundry for us, and the toilet finally earning MVP status. If you’re ready for your toddler to graduate from Diaper University, this is the diploma. Bonus: you’ll save money too.
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Reviewed in the United States on September 3, 2025
★★★★★ 5
Mom of 3 recommend!
Size: 5T-6T, Unit Count: 14
I'm using these again for the 3rd time and they're great as always. My 3rd is still having some issues at night time with bed wetting, and as they get older the bigger the mess, so these truly hold up to a full bladder. And they don't smell by morning like some diaper brands. I'm usually against pull ups, but these are great for up and down ease of use and that added protection when it comes to potty training. I love the bigger size inclusion for larger children which we struggle with for comfort compared to other brands.
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Reviewed in the United States on February 14, 2026
★★★★★ 5
Approved by an Overnight Registered Nurse, Has worked great last 4 years!
Item Package Quantity: 1, Size: 100 Count (Pack of 1)
I have worked overnight as a Registered Nurse for the last 4 of 6 years and I will offer my own experience on how these pills have helped me in my job performance. To start of with I have to say that no two human beings are the same so before I bought these pills I read the good and bad reviews and wasn't sure on the product. I've had heart palpitations in the past from excess caffeine when I drank one of the blue pop top Rock Stars with 1.5 times the caffeine as regular Rock Star and I can say that no, it's not fun at all. I've also experienced when I drink to much caffeine at once and find myself either visiting the restroom many times during a shift, or the crash that comes after the initial burst of energy. Anyways, I can say that with ONE pill a shift prior to going to work, I am able to stay awake and not in a forceful manner without the many negative effects from caffeine that I've experienced in the past. Working night shifts, I've seen how many co-workers need to chain drink coffee all night. I can't say that I don't like coffee, but I don't drink it more than once a week and I prefer not too if I have the chance. This is why I am glad that the Guarana Energizer has worked for me. I am able to be more alert all shift long, not have to struggle with energy or struggle with staying awake, and when I get home I not too wired where I have a hard time going to sleep. On my days off it also works as an excellent energy booster for the mornings to get your energy level going for your day ahead. Also, I've tried other guarana pills when the Source Naturals were no longer in stock (same 900 mg strength), and I have to say that I had to take more than 2 pills per shift to keep me awake, plus they never lasted a full shift. Don't know why the "energizer" term makes a difference, but it does for me. I recommend it to all my co-workers, and when they feel low on energy I've seen that even 1/2 a tab is sufficient for a little pick me up especially for those sensitive to caffeine.
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Reviewed in the United States on December 8, 2016
★★★★★ 5
The best guarana I've used - helped me kick energy drinks!
Item Package Quantity: 1, Size: 100 Count (Pack of 1)
I suppose I ought to stand in front of a group of people, and admit to being a caffeine addict. However, I rather like caffeine. I started in on caffeine at an early age- first by drinking soda- mostly cola- as often as my parents would allow. As a teenager, I discovered coffee. Later, it was espresso drinks- I loved a good quad-shot latte, and eventually was getting several a day. A few years ago, my stomach stopped agreeing with coffee as much, so I switched to energy drinks. I was drinking about 4 Rockstars a day.
After doing the math, I realized that I was spending around $300 a month on these silly beverages. To economize, I switched to No-Doz. However, it wasn't the same, and it honestly felt... unnatural. The No-Doz sometimes aggravated my stomach, and I just didn't feel as well. Then I tried Guarana, as it is one of the main functional ingredients in many energy drinks. Love it. It seems to last a bit longer (it could be my imagination there, I am unsure), and it definitely feels more natural. I take a few of these per day- and I seem to have less of a "caffeine crash" after 4 hours or so than I once did. It still happens, but it's more gentle.
My only complaint is that the pills are rather large- definitely a chore to swallow!
Bottom line- this stuff costs just a bit more than a bottle of No-Doz, and is made from natural stuff. It feels healthier, and probably is. I now spend in a month wha I spent in a day on energy drinks. Also- for what it's worth- I've tried other brands of guarana, and this one "feels" best.
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Reviewed in the United States on March 8, 2012