single cell dc/dc converter PCB BC327 PNP

this is a dc/dc converter PCB I designed a few years ago. One transistor, two coils, and some passive components. It is adjustable. prototype photo actual PCBs are infrared soldered. New revision of the dc/dc converter PCB! It has been tested from 1.2 volts to 5 volts input range. Small PIC circuits can be powered directly from 1.2 volts battery with … Continue reading

switching regulator test circuit (based on LM317)

  test circuit for switching power supply. Not using a ready-made IC! It is based on PNP transistor, and coil from a CFL. Efficiency is not so good but not too bad, the transistor does not heat up, dumping 6 volts into 22 Ohms, from 20 Volts. The circuit makes some noise! And it is not the latest technology…actually based … Continue reading