Glenn2;404347 Wrote: > > b) There is a large heatsink running around the perimeter of the PCB, > which has a regulator on each side. They are both L7805CV (ST brand). > They are 1.5A parts but both are connected directly in parallel, with > their outputs shorted together. This configuration is not ideal. You > can get away with it but the regulators do not share the load equally > and will have slightly different output voltages anyway. They will > fight each other. There should at least be small-value resistors on > the outputs of the regulators to isolate them from each other.
They won't exactly "fight" each other, since a linear regulator will only source current. The problem is that their internal references will never be _exactly_ the same, and this means that whichever one is trying to output the higher voltage will carry most, or all of the load, because the other one is not being driven to the point where it is actually regulating. This isn't merely "not ideal", it's a completely defective design. Also keep in mind the amp rating of a regulator assumes a particular die temperature which must be maintained by adequate heat sinking. Without a proper thermal solution, its capacity will be much less. -- seanadams ------------------------------------------------------------------------ seanadams's Profile: http://forums.slimdevices.com/member.php?userid=3 View this thread: http://forums.slimdevices.com/showthread.php?t=61090 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
