less hum: switching power supply?

[Tony Allgood]

Hi Ingo and all,

>The output voltage of the 7905 is just too high when there's no load
connected.

This is true, I have seen it too... and there is a web page detailing
this very problem, it used to be here:
http://www.hw.cz/english/docs/stabil79/stabil79.html

The 78xx do not seem to be affected.

Regards,

Tony Allgood  Penrith, Cumbria, UK

Modular synth circuits, TB303 clone and Filter Rack

http://www.techrepairs.freeserve.co.uk/projects.htm