Electronic construction kits
I had a Denshi Board
https://www.google.com/search?q=denshi+board&tbm=isch&ved=2ahUKEwi11tKIzP XsAhUV44UKHbq6DEwQ2-cCegQIABAA&oq=denshi+board&gs_lcp=CgNpbWcQA1DKuwJY yrsCYM7CAmgAcAB4AIABRogBRpIBATGYAQCgAQGqAQtnd3Mtd2 l6LWltZ8ABAQ&sclient=img&ei=nkepX7WPKJXGlwS69bLgBA &bih=723&biw=1330&client=firefox-b-d
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