Via seedstudio, I bumped into EasyEDA – Wikipedia. It seems there are a lot of on-line tools that allow you to draw and often simulate electronics.
Time to put them on my list of stuff to play around with:
Circuitlab also has a nice free interactive book: [WayBack] “Ultimate Electronics” Book – CircuitLab A free interactive electronics textbook, “Ultimate Electronics”
Later – via issue #1 of [WayBack] HackSpace magazine: The new magazine for the modern maker – I also found out about Fritzing which is off-line native software that I want to check out as it is open source:
[Archive.is] Fritzing

It helps a lot knowing there are various Electronic symbol – Wikipedia: Standards for symbols, covering much more than the one below:

To make it easier, power supplies have a host of different symbols for the same things. For instance, DC can have 3 or more different symbols. [WayBack] Electric Current Symbols
–jeroen
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