Is this a suitable power supply?

Other Hardware Motors, Mechanics, Power and CNC
1

Hi guys, I have an atmega on a pcb on which I have put my own voltage regulator with some capacitor smoothing and a 9v battery.

The circuit has 3 main components, the chip, a 16x 2 lcd and a digi pot. So no major current draw (100-150a max).

I now want to eliminate the battery and power the chip from the mains but i do not want to risk building a switch mode psu myself.

Is this the sort of pre made board that would be suitable?:

As this has a regulated 5v output am I right in thinking I can connect it straight to the chip without any further voltage regulators or capacitors? Or are there some further protective measures I should be taking?

I have attached a pic of my PCB basically I was going to run the PSU in, removing the vreg and caps in the lower left.

Thanks in advance

Krish

IMG_2716.jpg
IMG_2716.jpg2448×3264 1.28 MB

2

Use a USB power blob, by far the easiest and cheapest safe method to power 5V
projects.

3

Hi there, can you give me more info on this? Most importantly I need it to handle 110-240vac and be small enough to mount inside the project box.

I could get a 12v version if the ripple is too much and step it down to 5v as I am already doing but it seems illogical to use 2 voltage regulators in a row like that.

4

USB power blobs contain a 5V 0.5A (some have more current) regulated supply
and are universally available, and small and neat. Check out eBay, Deal eXtreme, etc.

5

AC/DC converters like this are intended to mount on the board

I would go with external walwart tho, just bring in 5V.
http://www.dipmicro.com/store/DCA-0510
and not bother with a regulator on the board.

6

The other advantage of a wallwart is that you don't need to support a bunch of power cord types. Just a 5.5/2.1mm barrel jack.

7

Hi there, I cannot use a wall wart unfortunately as I already have the Mains line running near the PBC powering a motor. I want to harness this power to power the Arduino. This mains line could be 110-240 v so the PSU needs to be switching.

8

I can count the bacteria on your hand.

I've taken apart wall warts before in order to incorporate them into projects. Just make they are still well insulated and separated from other components.

9

So, on board AC/DC, build the wallwart into your project, or disassemble and build into your project as polymorph suggests. The dipmicro units come apart with just a screw or two. Might even be able to remove the plug leads and wire onto the board where they connect.

Input Voltage 100V-240VAC
Frequency 50-60Hz
Output Voltage 5V
Output Current 1A

I use these for a lot of projects.

10

Ahh great thanks, and do you put any further capacitors etc? or is the output stable enough to go straight to the chip?

11

It's very stable. I usually have 1 or 10uF cap because the board is at the end of a long wire. If you are building it in & reducing the wire length, then 0.1uF cap on every chip on the board should be sufficient. 1uF at the end of the wire into the board wouldn't hurt.