I'm an extreme newbie when it comes to electronics, and decided to just dive right in.
I wired up my buck converter exactly like how it's done here: https://www.youtube.com/watch?v=fmdxSRaVPVg
Without a load, everything works fine. I was able to use the trimmer to set a max output of 6V, and the potentiometer (10k) allows me to vary output voltages from practically 0 to 6V. I'm using a 12V 2A DC wallwart as my input.
Now, I have some cheap fairy lights (The ones that are basically just parallel LEDs.) When I got them they were powered by 2x CR2302 batteries (in series.)
I was thinking everything would work out if I just connected my now liberated fairylight string to the output of the buck converter, as it's now outputing a clean 6V.
When I connect the fairylights to the converter, the lights will blink non-stop, and my buck converter stops displaying anything on it's built-in voltmeter. If I dial the potentiometer all the way down, I get a blinking red light on the buck converter for the 'IN'. The same issue occurs even when the potentiometer is removed.
Any ideas what's causing this and how to fix it?
- I haven't had much luck finding the exact model of the buck converter, since whenever I find it, it's only labeled as 'LM2596ADJ'
However, I do know the following specs:
- Input Voltage 4.5~ 40V.
- Output Voltage range 1.25V ~ 37V
- Output Current max 3.0A (recommended 2.0A)
- For the fairylights themselves, I really have no idea, but after using the multimeter, whenever I try to measure the current, it jumps around from 100mA to around 50mA.
EDIT, unfortunately, I don't know how to make schematics/diagrams, so hopefully some embedded photos will do.
Here's the completed board. Don't mind the poor solder joints, please.
Here's the potentiometer at the top. It's 10k.
How the pot-meter is joined to the board:
Here are some images/videos of what I've done: https://imgur.com/a/jxXCtSv