Ea elektro automatik ea ps 500 fixed voltage switch mode power supplies 150300w ea elektro automatik 35 320 125 this 150w fixed voltage psu 22 29v dc 52a from ea elektro automatik is a 150w fixed voltage dc power supply offering a 11 14v dc voltage range making it an ideal device for the hobbyist laboratory or school the output voltage range can be adjusted using a screwdriver on the potentiometer located via the power supplys underside manufactured to a high standard with a powdered s