Interesting circuit.
The Zener sets the output at 5.6 v minus a 0.7 V drop at Q2 (or Q1). The coil compensates for the negative AC wave drop near zero, and C2 for the positive (or vice versa), While C1 actually provides the power to them (I think?).
1N5819 is the back current prevention, and the little 47 uF filters out the remaining ripple.
I'm not convinced that the output is better than a 7805, but it's worth a test run. Now if I only had a scope...
|