TIL that early TV remotes worked with a spring-loaded hammer striking a solid aluminum rod in the device, which then rings out at an ultrasonic frequency, requiring no batteries.
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TIL that early TV remotes worked with a spring-loaded hammer striking a solid aluminum rod in the device, which then rings out at an ultrasonic frequency, requiring no batteries.
https://www.theverge.com/23810061/zenith-space-command-remote-control-button-of-the-month
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1fn32ux/til_that_early_tv_remotes_worked_with_a/
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