Forensic analysis of mains hum can be used to timestamp recordings!
...well, I found it intriguing!
...well, I found it intriguing!
the tape recorders were driven by synchronous motors, geared to the mains frequency, so it didn't work.
Forensic analysis of mains hum can be used to timestamp recordings!
...well, I found it intriguing!
Yes, indeed
I built a Nixie Tube clock for my dad from some redundant lab equipment - there was lots of mains voltage on that little PCB!
I built a Nixie Tube clock for my dad
Thank you, I was quite happy with it.I love the design on that case.
Thanks! That reminds me, I've been meaning to have a go at this for a while! :
clock
Thank you, I was quite happy with it.
The wood was an offcut that was left lying around.
The lid was something similar to a Ferrero Rocher case!
...and it was securely glued on, when I was sure it worked!
D'oh!
Find that a little strange as I'd have thought the inertial 'drag' of the motors would have had little influence on the voice recording variationIt was proposed during investigations of President Nixon's White House tapes, when his secretary had erased certain parts.
However, at the time, the tape recorders were driven by synchronous motors, geared to the mains frequency, so it didn't work.
Find that a little strange as I'd have thought the inertial 'drag' of the motors would have had little influence on the voice recording variation
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