I bought some of these from eBay.
http://www.ebay.com/itm/291355638787
I supply a 12V input and get an 11+V output and the pot adjustment screw changes nothing. I bought this assuming I can use the pot to adjust down the power output to my desired 5 or 3.3V.
Tried two units and getting same results.
Is there something I'm missing?
Thanks!
Do you have a load of some kind connected to the converter.
Buck converters need a minimum load at all times to regulate.
Sometimes its built onto the converter itself, otherwise you have to provide it.
If you want 5V , try something like 50 ohms.
Not from that description, it should work. Those are ten turn pots have you adjusted it enough. You should feel a click when you reach the end of the travel but you can keep on turning.
Thank you for the reply. The unit has an LED, but it can't be drawing much.
I did what you said, but I only had a 10k resistor with me. Didn't do it, so since I purchased several of these units I am testing, I needed something with variable input and just added another one on the output. Still didn't do it.
I spin the pot screw and I don't see even a 100th decimal place change.
Most of the rest of the components I have don't have variable input.
Should I try more resistors?
Grumpy_Mike, I spun the hell out of it. I did hear a click when I spun it down to one direction.
I may have a 12V light strip piece. I'm going to look for that now!
It does sound like they are not working.
Ok, I put a big load on it with a fairly long light strip. I had to keep spinning the pot and it eventually started to turn it down. Once I got to 5V that light strip wouldn't work anymore, but I got the output really close to 5V.
Wow, that was pretty weird. Er...educational for me.
Thank you, guys.