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also see here http://www.easytreasure.co.uk/hoh.htm
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Further tests - it even works with piezo-buzzer "beep"-metal-detectors.
And the vibration-motor still acts as a pretty quiet speaker for all signals
below the vibration-threshold which is adjustable with the variable resistor.
And I made some amazing discovery:
Seems the 2017 circuit works as metal-detector!
I built an improvised coil with ca. 5 windings out of the
audio-cable and moved a frying-pan 5cm above it and
it gave vibration-signals.
Just from the electromagnetical induction.
But this is no closed coil, its just a longer audio-cable.
Basically these are 2 open magnetical-loop antenna wires.
With the new circuit this does no longer works but for luck
now all the electrostatic disturbances are gone, too.
If you like, you can try the 2017 circuit for MD-possibilities -
perhaps with a 50 windings coil and other improvements.
MOSFET metal-detection by extreme amplified induction signals.
For deaf persons this new 2020 vibration circuit is gigantic
because like the vibrating bass it can make audio feelable
- but all kinds: Melodies, rhythms and voice per instance!
And it reacts on the weakest and already fainting signals.
I haven't tested this yet but perhaps its even possible to attach
a non-active microphone and it starts vibrating from the noise input.Comment
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