If you have an electronics bench, it complies with that you will requirement some type of bench power supply. While lots of make make with fixed-voltage supplies it’s risk-free to state that the most beneficial bench power supplies have variable voltage as well as a variable present limiter. These are offered in a variety of sizes as well as qualities, as well as can be had from the normal on the internet vendors starting with a surprisingly little outlay.
There is nevertheless a issue with low-cost bench power supplies. They are invariably switch-mode designs, as well as their output will commonly be noisy. costly linear supplies supply a much a lot more noise-free output, however do so at the cost of extreme warm loss when regulating a high voltage drop.
One option is a mixed-mode design, in which a switch-mode supply does the difficult work of minimizing the voltage a lot of of the way, as well as a linear regulator drops the last couple of volts to supply a noise-free output. [Andrei] shows us his style for just such a mixed-mode supply, as well as it’s one you can have a go at building yourself.
His main supply is an off-the-shelf switcher that turns mains AC into 24 V DC. This then feeds an LTC1624 buck converter that brings the voltage down to about 1.2 V above the final output voltage, this is in turn fed to a parallel pair of LT3081 linear regulators that provide the final noise-free output. There is an INA260 for voltage as well as present measurement, as well as an Arduino with LCD screen as a individual interface. His prototype has been well built utilizing a four-layer PCB, though he suggests it might be made on stripboard with the proper SMD adaptors. The cardboard chassis he’s utilized looks somewhat alarming though.
We’ve covered many bench power supplies right here throughout the years right here at Hackaday. If it is an author’s much-loved you are seeking though, take a look at the 723.