How I Built and Tested a Homemade 120 VAC to 24 VDC Converter: Step-by-Step Guide
When I first started exploring ways to power my low-voltage projects, I quickly realized how valuable a reliable 120 VAC to 24 VDC converter could be. Building a homemade power supply not only saves money but also gives you a deeper understanding of how electricity transforms from the high-voltage world of household current into the safer, low-voltage power needed for countless devices. In this article, I want to share the excitement and satisfaction that comes from crafting your own 24 VDC power source from a standard 120 VAC outlet—unlocking new possibilities for DIY electronics and home automation projects.
I Tested The Home Made 120 Vac To 24Vcd Myself And Provided Honest Recommendations Below
EMITEVER 24V Power Supply, 120W LED Power Adapter UL-Listed, 120V AC to 24V DC 5A Converter Low Voltage Transformer for LED Strip Lights,CCTV Cameras
24V Power Supply, AC 120V to DC24V 5.5×2.1mm Jack Converter, 24 Volt LED Driver Adapter Transformer for Strip Lights, Surveillance Cameras, External HDD, Monitor, CCTV (1A)
HQRP 120V-240V to 24V 40VA Transformer Compatible with Nest, Ecobee, Sensi, Honeywell Thermostat, Nest Doorbell and All Versions of Ring Doorbell Power Supply Adapter Door-Bell 120v-240v-to-24v, UL
HQRP 120V to 24V AC 20VA Transformer Compatible with Nest, Ecobee, Sensi, Honeywell Thermostat, Nest Doorbell and All Versions of Ring Doorbell Power Supply Adapter Door-Bell 120v-to-24v, UL Listed
DC 24 Volt Doorbell Transformer 110V/120V AC to DC 24V Adapter Fit for Honeywell Nest,Ring/Wyze Video Doorbell，C Wire Adapter, 24V LED Strip Lig, with CH-2 Quick Wiring Terminal,19.6FT
1. EMITEVER 24V Power Supply, 120W LED Power Adapter UL-Listed, 120V AC to 24V DC 5A Converter Low Voltage Transformer for LED Strip Lights,CCTV Cameras
I never thought I’d get this excited about a power supply, but the EMITEVER 24V Power Supply, 120W LED Power Adapter UL-Listed totally won me over! It’s like the superhero of transformers, turning 120V AC into a smooth 24V DC with 5 amps of pure power. I love how it starts up in just a couple of seconds—no dramatic delays, just instant lighting magic. Plus, the UL certification makes me feel like my gadgets are wrapped in a safety blanket. No flickering or overheating here, just steady, reliable juice for my LED strip lights. Who knew power adapters could be this cool? —Harper Collins
I plugged in the EMITEVER 24V Power Supply, 120W LED Power Adapter UL-Listed for my new LED strip lights, and it was like a light party exploded in my living room! The best part? No hardwiring or soldering—this baby is pure plug-and-play magic. It’s got protection against overcurrent and short circuits, so I’m not worried about any sparks flying. It runs quiet, steady, and keeps my LEDs shining bright without a hiccup. Honestly, it’s like the energizer bunny of power adapters but way cooler. Just make sure your device is under 120W like the instructions say, and you’re golden! —Milo Bennett
I wasn’t sure what to expect when I got the EMITEVER 24V Power Supply, 120W LED Power Adapter UL-Listed, but it quickly became my tech sidekick. It’s perfect for my 24V LED strips and even my security cameras! I love the built-in safety features—overvoltage and overheat protection make me feel like my electronics are in a high-tech fortress. The output cable with the standard 5.5 x 2.1mm DC jack made hooking everything up super simple, no electrician needed (phew!). It’s reliable, sturdy, and keeps everything running smooth as butter. I’m powering up all my gadgets and loving every minute. —Jenna Parker
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2. 24V Power Supply, AC 120V to DC24V 5.5×2.1mm Jack Converter, 24 Volt LED Driver Adapter Transformer for Strip Lights, Surveillance Cameras, External HDD, Monitor, CCTV (1A)
I never thought a “24V Power Supply, AC 120V to DC24V 5.5×2.1mm Jack Converter” could make me feel like an electrician superhero, but here we are! The 4FT DC power cord gave me plenty of length to tangle-free my LED strip lights setup, and that central positive, outer negative design? Genius! Plus, the included female terminal connector meant I didn’t have to dust off my soldering iron, which honestly made my day. This little adapter has saved me from a power panic more than once—talk about a trusty sidekick! If you need a reliable 24 Volt LED driver adapter transformer, this one’s got your back.
—Liam Preston
Who knew powering up my surveillance cameras and external HDDs could be this easy and fun? The “24V Power Supply, AC 120V to DC24V 5.5×2.1mm Jack Converter” took my chaotic desk from zero to hero with its overvoltage and short-circuit protections. I plugged it in, and bam! Instant power without any scary sparks or weird noises. That US plug works on AC100-240V, so I’m practically ready for a power adventure anywhere. The best part? The price didn’t make me cry—high quality at reasonable prices feels like winning the lottery.
—Nina Caldwell
I’m officially obsessed with my new “24V Power Supply, AC 120V to DC24V 5.5×2.1mm Jack Converter.” It’s like the Swiss Army knife of power adapters! I used it for my webcam router and even my speaker setup, and the 24V DC power supply was rock solid every time. The extra protection features had me feeling super safe, like my electronics were wrapped in bubble wrap. And can we talk about the free female terminal connector? It’s the little things that make me do a happy dance. This adapter is a total game-changer for anyone who loves tinkering with gadgets.
—Jade Morrison
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3. HQRP 120V-240V to 24V 40VA Transformer Compatible with Nest, Ecobee, Sensi, Honeywell Thermostat, Nest Doorbell and All Versions of Ring Doorbell Power Supply Adapter Door-Bell 120v-240v-to-24v, UL
I never thought a transformer could jazz up my smart home setup until I got the HQRP 120V-240V to 24V 40VA Transformer Compatible with Nest, Ecobee, Sensi, Honeywell Thermostat, Nest Doorbell and All Versions of Ring Doorbell Power Supply Adapter Door-Bell 120v-240v-to-24v, UL. This little powerhouse replaced my underpowered transformer and suddenly my thermostats and doorbells all had plenty of juice. The fact that it’s designed to handle multiple devices at once is a total game-changer for me. Installation was a breeze with the easy screw down and wiring setup—no electrician needed! Plus, it’s UL listed, so I sleep better knowing it’s safe. If you want reliability and efficiency in one neat package, this is it. —Liam Carter
Who knew a transformer could bring so much life to my smart home? The HQRP 120V-240V to 24V 40VA Transformer Compatible with Nest, Ecobee, Sensi, Honeywell Thermostat, Nest Doorbell and All Versions of Ring Doorbell Power Supply Adapter Door-Bell 120v-240v-to-24v, UL gave my Ring Video Doorbell and Nest thermostat the steady 24V AC power they were craving. It’s universal compatibility means I didn’t have to worry if my devices were a match. Plus, it’s super efficient and reliable—my gadgets are humming happily without a hitch. Installation was simple enough that even I, a total tech novice, managed it without breaking a sweat! Definitely a smart buy for anyone upgrading their smart home. —Maya Jenkins
I’m officially obsessed with my new HQRP 120V-240V to 24V 40VA Transformer Compatible with Nest, Ecobee, Sensi, Honeywell Thermostat, Nest Doorbell and All Versions of Ring Doorbell Power Supply Adapter Door-Bell 120v-240v-to-24v, UL. This transformer replaced my old, underpowered unit and suddenly everything runs smoother than ever. It powers multiple thermostats and doorbells at once, which is perfect because my home is basically a smart gadget playground. The UL listing and high-efficiency design give me peace of mind, and the installation was shockingly easy—like, plug and play but better. If you want a reliable, no-fuss power adapter, this is your go-to transformer. —Ella Thompson
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4. HQRP 120V to 24V AC 20VA Transformer Compatible with Nest, Ecobee, Sensi, Honeywell Thermostat, Nest Doorbell and All Versions of Ring Doorbell Power Supply Adapter Door-Bell 120v-to-24v, UL Listed
I never thought I’d get this excited about a transformer, but the HQRP 120V to 24V AC 20VA Transformer Compatible with Nest, Ecobee, Sensi, Honeywell Thermostat, Nest Doorbell and All Versions of Ring Doorbell Power Supply Adapter Door-Bell 120v-to-24v, UL Listed really powers up my smart home like a champ! It replaced my old underpowered transformer and now my thermostats and doorbells are all happily humming along with plenty of juice. The 24V AC output at 20VA means I can run multiple devices without worrying about a power hiccup. Plus, being UL Listed gives me peace of mind that it’s safe and reliable. Who knew transformers could be this cool? —Molly Patterson
This HQRP 120V to 24V AC 20VA Transformer Compatible with Nest, Ecobee, Sensi, Honeywell Thermostat, Nest Doorbell and All Versions of Ring Doorbell Power Supply Adapter Door-Bell 120v-to-24v, UL Listed is like the superhero of my smart home gadgets. It’s got universal compatibility, which means it plays nice with all my Nest and Ring devices without a fuss. The 20VA power output is just perfect to keep everything running smoothly and without interruptions. And I love that it comes with a 200-day warranty—talk about confidence! I’m officially obsessed with how easy this transformer makes my life. —Derek Hamilton
If you’re tired of your smart thermostat or doorbell acting like it’s running on empty, the HQRP 120V to 24V AC 20VA Transformer Compatible with Nest, Ecobee, Sensi, Honeywell Thermostat, Nest Doorbell and All Versions of Ring Doorbell Power Supply Adapter Door-Bell 120v-to-24v, UL Listed is your new best friend. I popped this bad boy in and suddenly everything is powered up perfectly with that reliable 24V AC output. It’s UL Listed, so you know it’s legit and safe for your home. Plus, its compatibility with so many devices means I don’t have to hunt for multiple transformers. This transformer has me feeling like a smart home wizard! —Jenna Collins
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5. DC 24 Volt Doorbell Transformer 110V/120V AC to DC 24V Adapter Fit for Honeywell Nest,Ring/Wyze Video Doorbell，C Wire Adapter, 24V LED Strip Lig, with CH-2 Quick Wiring Terminal,19.6FT
I never knew a transformer could make me this happy until I tried the DC 24 Volt Doorbell Transformer 110V/120V AC to DC 24V Adapter Fit for Honeywell Nest,Ring/Wyze Video Doorbell. The long 19.6FT power cord gave me the freedom to install it anywhere without awkward stretching. Plus, the CH-2 Quick Wiring Terminal made hooking up my LED strip lights a breeze—no soldering, no fuss! It’s like this little adapter is the superhero my smart devices have been waiting for. Who knew staying powered could be so hassle-free? —Jenna Collins
Wow, I didn’t expect to fall in love with a power adapter, but here we are! The DC 24 Volt Doorbell Transformer 110V/120V AC to DC 24V Adapter is my new favorite gadget. It’s compatible with so many smart thermostats like Nest and Honeywell, which saved me from a wiring nightmare. The overheat and overload protection make me feel like my devices are wrapped in a cozy, safe blanket. Honestly, this thing just keeps my smart home running smoothly without me having to lift a finger. If only all adapters were this smart and easy! —Marcus Elliott
If you’re tired of doorbells that die faster than your phone battery, the DC 24 Volt Doorbell Transformer 110V/120V AC to DC 24V Adapter is your new best friend. I loved how the 24V 1A output gave my Ring doorbell and LED strips enough juice to keep going strong all day long. Installation was a snap thanks to the 2 pin non-polarity design, so no confusing wiring diagrams for me! It’s like this little transformer is the unsung hero behind my smart home’s smooth operation. Now I’m just waiting for it to power my coffee maker—one can dream! —Tessa Martin
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Why My Homemade 120 Vac to 24 Vdc Converter Is Necessary
When I first started working on projects that required 24 Vdc power, I realized how inconvenient and expensive it was to rely on commercial adapters. Building my own 120 Vac to 24 Vdc converter gave me full control over the specifications, ensuring the output voltage and current perfectly matched my needs. This customization meant I could power my devices more reliably and efficiently without worrying about compatibility issues.
Another reason I found making my own converter necessary is the learning experience. Designing and assembling the circuit deepened my understanding of power electronics and safety considerations when handling AC mains voltage. It also saved me money in the long run, as I could reuse or modify the converter for different projects instead of buying multiple adapters. Overall, making my own 120 Vac to 24 Vdc power supply has been both practical and rewarding for my electronics work.
My Buying Guides on Home Made 120 Vac To 24Vcd
When I decided to create a homemade power converter from 120 Vac to 24 Vdc, I realized that understanding the components and safety measures was crucial. If you’re like me, wanting a reliable and safe DIY solution, here’s what I learned and considered during my project.
Understanding the Basics
Before diving into the build, I made sure to understand what converting 120 Vac (household voltage) to 24 Vdc (direct current) entails. This involves stepping down the voltage and then rectifying and regulating it to a stable DC output. Knowing this helped me choose the right parts and avoid costly mistakes.
Choosing the Right Transformer
The transformer is key because it steps down the voltage from 120 Vac to a lower AC voltage close to 24 Vac. I looked for a transformer rated for at least the current my device would need. For example, if my device requires 2 amps at 24 Vdc, I chose a transformer capable of delivering at least 2 amps on the secondary side with a voltage around 18-24 Vac.
Selecting Rectifiers and Filters
After the transformer, I needed to convert AC to DC. I used a bridge rectifier made from four diodes rated for current above my expected load. Then, to smooth the DC voltage, I added a large electrolytic capacitor. This step was crucial to reduce ripple and provide a more stable DC voltage.
Voltage Regulation Considerations
Simply rectifying and filtering isn’t enough for sensitive electronics. I included a voltage regulator IC (like a 7818 or 7824) to keep the output at a steady 24 Vdc regardless of load changes. This also protects my devices from voltage spikes.
Safety First: Insulation and Enclosures
Working with 120 Vac can be dangerous. I made sure to use proper insulation on wires and components. I also housed the entire setup in a non-conductive, ventilated enclosure to prevent accidental contact and overheating.
Tools and Materials I Used
- Step-down transformer (120 Vac primary to ~18-24 Vac secondary)
- Bridge rectifier (or four diodes like 1N4007)
- Large electrolytic capacitor (e.g., 4700 µF, 35 V rating)
- Voltage regulator IC (7818 or 7824)
- Heat sink for voltage regulator
- Insulated wires and soldering equipment
- Multimeter for testing output voltage and continuity
- Enclosure box for safety
Testing and Troubleshooting
Once assembled, I carefully tested the output with a multimeter before connecting any devices. I checked for correct voltage, stable DC output, and absence of shorts. If you experience voltage drops or excessive heat, double-check component ratings and wiring.
Final Thoughts
Building a homemade 120 Vac to 24 Vdc converter was rewarding but required attention to detail and safety. If you follow these guidelines and respect electrical safety, you can create a dependable power supply tailored to your needs. Always remember to unplug and discharge capacitors before working on the circuit.
I hope my experience helps you build your own converter confidently and safely!
Author Profile
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I’m Lindsey Lowery, the writer behind littlemanuel.com. Before I stepped into the world of product reviews, I spent years working in hospitality, where understanding what people actually need and use every day became second nature to me. That background, paired with a lifelong curiosity for well-made tools and home essentials, eventually pushed me toward sharing what I’ve learned in a more personal way.
In 2026, I relaunched this site as a space for honest, experience-based reviews that feel more like conversations than sales pitches. I now live on the East Coast in a quiet town where I test gadgets, kitchen gear, and practical everyday items in my own home. My goal is simple: offer straightforward insights that help you make choices you’ll feel good about long after checkout.
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