RE: Nigel's IR Transmitter - a beginners tale (longish)

[Nigel Orr <nigel@xxxxxxx>]

At 13:42 09/11/00 +0000, you wrote:
>Am I correct in reading the 'T' junctions as joins, the cross with a
blob as
>joined and no blob as not joined.

Yes, I think it's actually some ISO standard or something now, to recognise
the fact that most folk design on computer, and the little 'half-moon'
shapes are harder for software to cope with neatly... but it is confusing
at first glance!  The blobs are easy, and the T's are easy, but where
there's a cross and no blob, it's hard to know if the designer just forgot
(especially when the designer is known for being forgetful!)

>The reason I am asking is the connections
>at the bottom left of the diagramare a little copnfusing to this
novice.

All the connections at the bottom left are 0V, you could add a 4th blob,
but I didn't, I'll explain the detailed reasons if you want, but it
probably doesn't matter.  In short, if you physically connect the wires as
shown on the schematic, it should be the most reliable, but it is unlikely
to matter in reality.

>In the old days I used a blob to indicate a join and a little half moon
>crossing to indicate the tracks simply crossed and were not joined.

I still do that when hand-drawing, it's _so_ much easier to follow.

Nigel


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