I remember changing the channel on a color HeathKit TV at my grandparents by shaking house keys because the ultrasonic remote sensor circuit interpreted it as channel down. (It had a diagnostic and circuit diagram on a fold-down panel IIRC.)
Also my father and grandfather both made multiple technology generations of oscilloscopes from kits. And, my father opened an electrical automotive shop in Santa Clara, thanks in part to learning from HeathKit and other study-at-home electronics courses.
I remember changing the channel on a color HeathKit TV at my grandparents by shaking house keys because the ultrasonic remote sensor circuit interpreted it as channel down. (It had a diagnostic and circuit diagram on a fold-down panel IIRC.)
Also my father and grandfather both made multiple technology generations of oscilloscopes from kits. And, my father opened an electrical automotive shop in Santa Clara, thanks in part to learning from HeathKit and other study-at-home electronics courses.