9B15 B
 Most switching power supplies do not use a line isolation transformer. This implies the following:
A. No line isolation will improve the No load/Full load response.
B. There is no line isolation. Using a grounded scope in this system will destroy the supply.
C. Low voltages cannot be achieved due to the high power required for voltage conversion.
D. This is a transformerless system, which reduces parts cost, which makes it a desired unit.
