>> The circuit schematic and PCB board in the photo
>> is PWR-671, in my RIS-671 project file. It uses
>> an IR2085 for PWM and MOSFET driving, and has a
>> zener+7812, so Vmax could be up to 130V, if R13,
> what on earth was that schematic drawn in?
Yes, it doesn't look as good as most of my schematics.
But it was drawn 10 years ago in PCAD, and then imported
into Altium. More relevant, it was done quickly, using
the standard schematic component images, which are big
and clunky. With those images, one needs to allow more
space between things or it looks a mess. With a little
extra care, PCAD can make very nice schematics. So can
Protel and Altium, although not quite as nice as PCAD.
None of them are decent drawing programs, they don't let
you decently control line widths, angles, curves, etc.
Altium does let us pick font types, fine-tune sizes, and
set snap grids.
We use Illustrator for our book's figures, but that's a
lot more time consuming. We make a careful hand drawing
that's as close as possible to our final expected figure.
Our publisher, C.U.P., hires our drawings out to a firm
in India, where a few of their staff have become quite
proficient, after doing many hundreds of our schematics.
Paul has become a true Illustrator expert, and fixes and
cleans up their work, then we sit together and hand edit
each one for a final pass. But even with this high level
of scrutiny, it's amazing what stupid careless mistakes
leak through. When you're adjusting line spacing, etc.,
it's easy to overlook that the wire is going to the wrong
place, etc. I try to examine the drawing in stages, first
scanning for one type of issue, like part values, then
for another, wiring connections, then the component shape,
etc. But in the process we have still ended up with some
silly errors, like +,- symbols backwards on op-amps, etc.