Some subjects remain popular for DIY projects, either because a satisfactory solution has not yet been found or just because the result is something useful. Clocks is one example, power supplies another. At Elektor.Labs we have done many, many PSU designs, from too simple to overly complex and yet we manage to find excuses to do a new one every time.

In 2010 we published a power supply called UniLab (Elektor project 090786). It was able to deliver 30V and 3A. This new design can be considered its successor. The maximum voltage is also 30V and the maximum output current is limited to a little over 3A (5A is possible, but with reservations). This time a different step-down converter was chosen, the LM2677-ADJ. It has a higher switching frequency (260 kHz), which reduces the size of the output filter.

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