--- Rikard Bosnjakovic <rikard.bosnjakovic@gmail.com>
wrote:

> On 3/6/07, Marcel Birthelmer
> <marcelb.lists@gmail.com> wrote:
> [...]
> >  In the idle state, both voltages are low. When
> one switch (assume
> > it's SW1, without loss of generality) is closed,
> the transistor Q2
> > turns on, dropping its collector voltage (and thus
> Q3's base voltage)
> > close to 0. Q3, in turn, is cut off, leaving no
> current to flow
> > through SW2 if it is closed. The same takes place
> if SW2 is pressed
> > first. When SW3 is closed, both outputs are forced
> high via the
> > diodes.
> 
> Brilliant.
> 
> Given the explaination, I didn't have too much
> difficulties
> understanding the circuit, but I would have most
> likely never been
> able to design something similiar myself.
> 
> How do you professionals do when you design stuff
> like this?
> 
> 
  I am not a professional designer but my
understanding depends mainly on my knowledge and
application of previous work. You ought too build more
circuit with simpler design first and start applying
from there. In electronics, application of simple
designs from the TEXTBOOK is crucial plus some
experience on the breadboard. It is really not a
problem once you break it down. Perhaps you need to
read on circuit analysis first to be quicker in
identifying circuits. Once again try and try again.
Just match the theory in your mind to the circuit.

John




 
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