Hallo Martijn, Aan 9-06-98 12:33, in bericht <19980609123311.B8972@mud.stack.nl>, Martijn van Buul <firstname.lastname@example.org> schreef: > Martijn van Buul wrote: > > > (Oh yeah. Because it has two 7805's.. Hmmm..) > > And one of them was broken. The thing works now, yet I don't feel at ease. > I'm not quite sure that I fixed the real cause, since those regulators > get just a little too hot. (Hotter than the ones in my 3032, while it has > the same motherboard). Time will tell. To be sure of a good working 7805 the difference between in- and output must be minimal 3 Volts. The warmth the 7805 produces is the result of 'difference in voltage' times current (Watt = Volt * Ampere). If the Vdiff is more the 3 Volt you can reduce it by placing a resistor or several diodes between the 7805 and the original powersupply. The 7805 will generate less heat in this way but this lesser heat is now generated by the R or Ds.I prefer the diodes because it is easier to spread the generated warmth. Groetjes, Ruud - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail email@example.com.
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