Building a Power Supply for My Project

[LoveChip]

I need to build a power supply with adjustable output voltage for my DIY electronics project that can power a variety of electronic devices including Arduino-based projects, small motors, sensors, etc.

For the core electronics of this power supply, I have two choices, one is the RT8223MGQW synchronous step-down converter, and the other is the MP2307DN-LF-Z. Does anyone know which one fits better?

MP2307DN-LF-Z specs

RT8223MGQW specs

 

[betwixt]

MP2307 is obsolete, you might have trouble finding them.
A thought - if you are at DIY level with Arduino projects, do you have the equipment and experience to handle these tiny SMD devices? No offense meant if you are.

Brian.

 

[KlausST]

For the core electronics of this power supply, I have two choices, one is the RT8223MGQW synchronous step-down converter, and the other is the MP2307DN-LF-Z. Does anyone know which one fits better?

I have a brown shoe and a green shoe ... which one fits my daughter better?
What I want to say: How could we know? .. since you don´t give any value we could do a "fit" check on.

Arduino, motor, sensor ... neither gives informations about voltage and current.

Also we don´t know what your input power source is.

Klaus

 

[cupoftea]

So you want to build it yourself as a project...or you just want a variable power supply and you are happy to just buy it in?
There are loads of Lab or Bench power supplies for sale offTheShelf which do what you want?

 

[codemaster11]

i think instead of building a complete circuit for diy adjustable dc power supply. use 19v adapter with LM317 with series pass transistor. arduino and sensors need very low current in mA and Vindc of 5vdc or 3.3vdc .but for motor like small servo motor include series pass transistor.

 

[ousmacad]

For the core electronics of this power supply, I have two choices, one is the RT8223MGQW synchronous step-down converter, and the other is the MP2307DN-LF-Z. Does anyone know which one fits better?

MP2307DN-LF-Z specs

RT8223MGQW specs

Cool project—building your own adjustable power supply is a great way to learn and get flexibility for your electronics work.


Between the two options, both are solid choices, but they serve slightly different purposes depending on your specific requirements:

• MP2307DN-LF-Z is simpler and quite popular for DIY adjustable buck converters. It’s a good all-around chip, especially for lower-current applications (up to about 3A), and it’s widely available with plenty of example circuits online. Great for powering Arduinos, sensors, and small loads.
• RT8223MGQW is a dual-phase synchronous step-down controller and generally more complex. It's designed more for high-performance applications, especially where you might want to regulate two different voltages or have tighter voltage control. It's probably overkill for most basic hobby electronics unless you're doing something more advanced or power-hungry.

So if you're aiming for ease of use, compactness, and just need a reliable adjustable supply for microcontrollers, sensors, etc., I’d say the MP2307 is likely the better fit. But if you're experimenting with more complex regulation or multi-rail output, the RT8223 could be a fun challenge.

 

[D.A.(Tony)Stewart]

I can't imagine anyone doing a DIY power supply to do what you want better or cheaper than all the functions in these lab supplies. The prices have jumped up recently but well worth getting the analog or digital ones with CV, CC, and Watts displayed.. Analog is easier to use. Digital controls have V,I,W meters...

e.g. https://www.banggood.com/search/power-supply.html

--- Updated Monday at 3:30 PM ---

i think instead of building a complete circuit for diy adjustable dc power supply. use 19v adapter with LM317 with series pass transistor. arduino and sensors need very low current in mA and Vindc of 5vdc or 3.3vdc .but for motor like small servo motor include series pass transistor.

You can buy these for < $10

 

[danadakk]

A basic supply is real handy if it has :

1) V and I readout on meters or digital
2) Adjustable current limit, handy if you are unsure of state of
device you are powering, like new design first time power up or
fixing an instrument or system of some sort
3) Nice to have one allows creating a split supply, + and -

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