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

68k computer system, first test, power up bootloader and RAM PCB.

bootloader and memory module stacked together posted by (C)tetsu-jp finally after a time of more than 3 years, I am getting more close to realize this project. A small scaleable 68000 computer! It is based on exchangeable modules, for instance the address decoding is done on an extra PCB. All the modules can be exchanged, while at first, I use … Continue reading