BUCK CONVERTER MC34063 (step down converter)

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another usefull circuit is the buck converter.
A buck converter (step-down converter) is a DC-to-DC power converter which steps down voltage (while stepping up current) from its input (supply) to its output (load).
here is a pcb that i designed using smd and through hole components for reducing the size of pcb.
the only difference is that i used bc869 and not 2n5401 shown in schematics. 
the output voltage can be adjusted by the trimm 20k.the pcb i designed uses a multiturn trimpot for higher precision.maximum output current is about 700ma.

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