A quick look at
these power supplies shows the price has gone up, but they are an incredible value still. Most of these are buck-only supplies (output is less than input voltage) but they are available in buck/boost too. For the buck only type, connect a power supply of greater voltage than you need, and you have an adjustable power supply that can supply from 0 volts to a couple volts less than the supply voltage.
The display shows:
o Voltage supplied
o Current being drawn
o Power being delivered
Additionally, the a current limit can be set and the supply used as a constant current source. The version shown here has the most features. Other types that come in a similar package may have fewer features. Some of these supplies are Bluetooth-capable. Monitor and control voltage and current remotely.
View attachment 140524
View attachment 140525