Re: Please clarify European resistor value notation for me



Joerg wrote:

Jim Thompson wrote:

John Larkin <jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
Joerg notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote:
Paul Burke wrote:
Mike Monett wrote:

However, I'm concerned that the symbol for variable capacitors seems
to have changed to two flat plates with a diagonal arrow. There is no
way to indicate which plate is the rotor.

You're always free to add a note to the diagram, or better to the
schematic symbol so they can't mess it up on the layout.

Even better would be to create a new part on the CAD system. That's what
I always do. Except that after switching to Cadsoft they were all there
already.

We always draw our own parts. The stuff in the standard PADS library
is just too ugly. We also have our own symbols for things like mosfets
and schottky diodes that are, to me, more intuitive and readable than
the accepted stuff.

The debate over US/european/tibetan schematic symbols is silly. We
just make up anything that we like. Why follow rules when you can make
rules?

True. But I am a hired hand so have to abide by what the client wants.

Same here... very human-readable schematics, but netlists are what the
layout guys want.

I became very careful about that. Basically my layouter re-draws the
schematic most of the time. That takes a few extra hours but it's well
invested time.

The pinout on even the most mundane parts such as a BSS123 is not
standard. At first the layouter didn't think so until it did go wrong.
Data*** said 3-1-2, his CAD said 1-3-2. Bzzzzt. What blew me away was
that they even changed it when Siemens became Infineon. IOW there is no
standard.

I've resorted to labelling transistor pins b, c, e etc so that you have to check
the layout symbol thus ensuring it *should* be right.

Graham

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