Oh I absolutely loved those. In the early 90, when I was maybe 6 years old, I had this one, the left half at least:https://commons.wikimedia.org/wiki/File:Kosmos-electronic-sy...

It came with over 20 electronic schematics, pictograms how they were set up in the box, an explanation how they worked and a kid compatible story about a professor, a robot and I think some kids. I absolutely loved it. And I can say with absolute certainty that I wouldnt have chosen my current career and hobby trajectory had it not been for this electronics set.

I've moved cities multiple times now and the kit has disappeared over the years. You can still get them on ebay some times, but I was too cheap to buy one.

Through an incomprehensibly unlikely coincidence, someone put this exact kit on the sidewalk for grabs a fee houses and away, maybe a year ago or two. Naturally I took it, and it's complete and seems even unused.

I am now a father and I hope my daughter will find this kit just as interesting as I did 30 years ago.