Home » Regulated Power supplies » 10 » c The purpose of a series pass transistor in a regulated power supply is to:   a.   suppress voltage spikes across the transformer secondary winding   b.   work as a surge multiplier to speed up regulation   c.   amplify output voltage errors to assist regulation   d.   allow for a higher current to be supplied than the regulator would otherwise allow Your answer "c" is not correct. "d" is the right answer. That was the last question for this topic.