I have an interest in electronics from the 1960’s and 1970’s. One rather unique product of that time is a hands-on “building block” approach to putting circuits together, somewhat like the much more recent Legos RCX controller and associated attachments. This article describes the introduction of the Raytheon Lectron series of electronic block kits.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.
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I actually remember having one of those sets. I suppose it would be valuable today; but in true hacker fashion, once I graduated to breadboards and PCBs I cannibalized the electronic parts for other projects…