What might be a useful function of this circuit?

A bridge rectifier

Part of a power supply that blows up

A frequency doubler

A full wave rectifer


Answer: The USEFUL application would be a frequency doubler.



The people who answered it right were:

G4AXX
KX0R
WQ8C
kn6vr
WA2OQT
Stu P. Dass
K1OGF
NJ AM'ER

Thanks to everyone who gave it a try.