Hi!
Can I take the opportunity to advise Members to be careful of electrolytic capacitor symbol polarities on some of the less well–known maker's circuit diagrams please?
Amber, who manufacture a range of audio testing equipment, use the conventional symbol of a black plate and an open plate, but for reasons known only to themselves, they've used the black plate as positive !
Some E. European makers that use the horrible i.e.c. symbol have used the "open box" plate as negative as well !
Admittedly these makers do clarify the polarity with a plus sign, but what's the point of having a "standard" when maker's invent their own variations on a theme?
The circuit symbols on my drawings (see my most recent posts on page 2 of this thread:–
https://www.eevblog.com/forum/testgear/soviet-oscilloscopes/. . . here on the Soviet C1-112A Oscilloscope for an example) are based on those specified by BS3939 (1975 edition) which have been standardized by UK Electronic Magazine publishers since the last world war, and are almost identical to the symbols used in "Elektor" magazine.
(I have added the Russian system of coding resistor wattage ratings on my C1-112A drawings as it saves adding endless extra part wattage references) – if a clear table is provided on the diagram there's no problems with this!)
The other reason I've not adopted the ghastly single–line '60617 representation is that my drawing software uses the older 1975 type symbols in it's libraries and I'm not going to spend hours redrawing them all just to please the Germans, etc., who dreamed up '60617 in the first place – they can keep them along with their horrible i.s.o./i.e.c. lettering !
Chris Williams