Hi All,
My first post here so be nice
please
.
I spent an hour or so meticulously putting together this kit:
https://www.aliexpress.com/item/0-30V-2mA-3A-Adjustable-DC-Regulated-Power-Supply-Diy-Kit-Short-Circuit-Current-Limiting-Protection/32814203124.html?spm=2114.search0204.8.24.77151dbKM88qE&priceBeautifyAB=4 after which, I wanted to hook up a voltage meter and an ammeter (
https://www.aliexpress.com/item/1pcs-Top-Quality-5-bit-DC-0-0000-3-0000A-Red-LED-Display-Digital-Ammeter-amperimetro/32640299154.html?spm=a2g0s.9042311.0.0.QEKCjh)
Once I had connected these, and added a DC motor to the DC out - I powered the unit on and something or multiple somethings started smoking. Now the unit can no longer adjust the voltage - its 'stuck' at 30v DC out. I re-read the installation instructions for the ammeter and it said to connect after the DC load, whereas I connected it before the load. I'm not sure this would have caused the problem.
I've attached the circuit diagram for the unit (does not include what I added). Here's how I connected things:
24v 'fan' output (+) --> ammeter + (to power the unit, not the current measuring part)
24v 'fan' output (-) --> ammeter - (to power the unit, not the current measuring part)
PS DC OUT (+) --> ammeter (+) && PS DC OUT (+) --> voltage meter
ammeter (-) --> DC motor (+)
DC motor (-) --> PS DC OUT (-)
So essentially the voltage meter is connected in parallel across the (+) and (-) of the DC out, while the ammeter and DC motor are connected to the same output in series.
I disconnected everything after it smoked a bit so I can't be 100% this is how it was connected, but I'm pretty sure it was. One thing I noticed is that the ammeter display started flickering and the DC motor didn't start moving when I increased the voltage (just before smoking). Any suggestions would be greatly appreciated. A friend of mine suggested buying a new kit (they are pretty cheap) but I am curious as to what went wrong and would like to repair if possible.
Cheers!