component layouts?

[Haible Juergen]

	>Good suggestions from Jules and Jim. I would add a suggestion from
recent
	>experiences I have had working on VCO design -- include lots of
ferrite
	>beads on the power supply lines. I divided the circuit into several
circuit
	>blocks and ran separate power lines for each section through
ferrite beads
	>back to a common supply input. This is the first time I have been
able to
	>virtually eliminate switching spikes from showing up in the expo
converter,
	>etc. This may be overkill for many applications, of course, but for
critical
	>circuits with wide ranging voltages it really works well. It has a
big
	>advantage over the usual technique of adding series decoupling
resistors in
	>that the supply remains "hard" at dc, in other words, there is no
shift in
	>supply voltage as the load current varies.

Ferrite stuff sounds reasonable. I will try them for my next VCO.
On my most recent VCO, I've used a different method to create an "isolated"
+5V and +10V supply. See
 http://home.debitel.net/user/jhaible/jh_720_vco_core.gif
for details (upper left corner). I have not made any measurments, but
I have no problems with soft sync between 2 VCOs at all.
But admitted, Ferrite beads would be more convenient for sure.

JH.