Intermediate
Bench Power Supply
Assemble a low-voltage adjustable bench supply using a DC-DC module and protected output terminals.
Safety first, always.
ElectroLab AI teaches theory, low-voltage electronics, and planning concepts. Mains voltage, switchboards, fixed wiring, high-current systems, and legal electrical work must only be performed by licensed electricians where required.
Open Safety CenterBuild target
Create an adjustable low-voltage supply for electronics testing.
Build steps
1.Choose a DC input adapter and buck/boost module with suitable ratings.
2.Mount the module, switch, display, fuse, and binding posts in an enclosure.
3.Wire input and output polarity carefully.
4.Set voltage with no load, then test with a resistor load.
5.Label voltage/current limits clearly on the enclosure.
What you are learning
1.A bench supply lets you control voltage while testing circuits.
2.Current limiting protects prototypes when faults happen.
3.Fuses and enclosure strain relief reduce risk from mistakes.
Bench tests
1.Measure output voltage across the full adjustment range.
2.Test current limit with a suitable dummy load.
3.Check module temperature after several minutes.
Fault finding
1.Output drops under load: adapter or module current rating is too low.
2.Display wrong: check sense wire and polarity.
3.Module hot: improve ventilation or reduce load.
Upgrades
1.Add banana sockets and USB output.
2.Add a current limit knob.
3.Add reverse polarity protection.
Project safety
Use an approved external DC adapter. Do not build or modify mains-powered supplies unless licensed/qualified where required.