"Retro Repair" key electronics skills?

10 May 2016

...
   Remember one
of Don Vonada's laws 'Digital Circuits are made from
 Analogue Parts'  
 That's an interesting saying. 
Maurice Wilkes (as in EDSAC) once told me 'A digital circuit is like a tame
animal. An analogue circuit is like a wild animal. Every so often the digital
circuit decides to go back to the wild' :-)

Another of Don Vonada's laws is 'There is no such thing as ground'. This
has 2 meanings. The first is the obvious one that a voltmeter has 2 leads 
and it is up to you to choose a reference point to measure voltages with
respect to, The other is that, as I said before, any ground connection has
impedance (it's the inductance that is troublesome normally) so that 
points (say IC pins) that are shown as grounded may actually have a voltage
difference between them.

-tony

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"Retro Repair" key electronics skills?