Velleman 3a power supply kit velleman k7203 this velleman power supply kit is meant as an auxiliary or as a permanent power supply for all common velleman kits based on a stabilised dc voltage between 3 and 30v provided that the consumption does not exceed 3a but can also be used for other purposes by replacing the trimmer with a potentiometer it can even be used as an adjustable power supply unit velleman k7203 3v to 30v 3a power supply electronics kit