Digital Bechtop Power Supply (2)
The construction of the Digital PSU requires extra care and precision. Just like the electronics inside, the mechanical construction and overall finish of the instrument should meet professional requirements.As indicated at the outset, there are two versions of the power supply that you can build. However, we have decided not to produce special circuit board and front panel layouts for the smaller power supply and concentrated on the larger 2.5 A unit.For the 2.5 A power supply a metal enclosure 200 mm (width) by 180 mm (depth) by 100 mm (height) and a 24 V 80 VA toroidal transformer are used, with all the parts of the enclosure securely connected to earth. A mains filter must also be fitted, or else the microcontroller may reset in the event of mains interference. The circuit board is fixed to the front panel with bolts, while the base simply carries the toroidal transformer (and possibly also, as shown in the photograph, the mains filter).