In message <mpro.lkdlib02n7n2801k0.lists@xxxxxxxxxxxxxxxxxx> Steve Fryatt <lists@xxxxxxxxxxxxxxxxxx> wrote: > On 28 Apr, Julie wrote in message > <51cb21b2ebjulie@xxxxxxxxxxxxxxxxxxxxxxx>: > > > On 28 Apr, charles <charles@xxxxxxxxxxxxxxxxxxxxxxx> wrote: > > > > > surely a diode would drop the supply voltage by 1.2v which would give a > > > 4v supply to the motherboard. > > > > 0.7V if it's silicon, 0.2V if it's germanium, but even that might be too > > much. > > In theory. In practice, working out the actual voltage drop will be "a > little more complicated than that". > > I'm not even sure what the diode is supposed to achieve: the smoothing will > happen without it (using just another output cap), and adding sufficiant > capacitance to have any useful effect will still break the PSU's startup to > the point that either it or the Iyonix are likely not to start at all. > Well, it would separate the smoothing capacitor and mainboard from the other less sensitive higher load components such as harddrive CDROM thus reducing current requirements of the smoothing components. I recall silicon diodes dropping .4V Can you get large germanium diodes? The only other way would be to have a separate small psu feeding the mainboard. A 5V specific psu might allow adjustment or further filtering. Getting it to turn on with the main psu would be the thing. Ron M. --- To alter your preferences or leave the group, visit //www.freelists.org/list/iyonix-support Other info via //www.freelists.org/webpage/iyonix-support List-related queries to iyonix-support-moderators@xxxxxxxxxxxxx