BUCK CONVERTER MC34063 (step down converter)
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.