Harry H. Arends wrote:
> Or just a simple diode in series. There wil be a 0.6 volt drop
> Over the diode resulting in 5 Volt

If you're going to do that, at least use a transistor.  Put the 5.6V on the
base of a NPN with the collector going to the 9V semi-regulated supply.  The
emitter will be roughly a 5V output with lower impedence than when using
just a diode.

If I was doing this, I'd probably use a 7805 from the 9V supply.  Be careful
if you're making a 5V supply just on the daughter board though.  The input
signals could still be 5.6V, which would need to be clipped.


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