If you’re not familiar with the 555 timer, suffice it to say that this ... which can also be reset with an external active-low signal. Finally, the output from the latch drives the OUTput ...
In short, it’s a life-saving device that emits an S.O.S. signal in Morse code over both the AM and FM bands. The device uses five 555 timers to get the job done, each of them dedicated to a ...
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