tractorb@ihug.co.nz said: > I thought it may be a reference supply for the EFC pin- with a 12.03 volt > supply the unknown pin measures at 2.803 volts-which is usefully above the > required EFC voltage ( ~2.4 volts) to bring it on frequency. > But does anyone have some hard data on this 'unknown' pin? Is it input or output? What happens if you pull it to ground with a 10K or 1K resistor? Or measure the impedance when powered off. 2.8 volts seems a bit low to be a useful supply. -- These are my opinions. I hate spam.