Laurance Scott uses 555 timer. The time period is defined by resistance and capacitance. Change in temperature, humidity or capacitance due to placement of the unit may cause reference time to drift.
When it was published I assume there wasn’t any good thumper applications for mobile phones.
You can get some mobile metronome applications for mobile that will make vibrations at desired time, and some of them will work even when the screen is off.
You can buy a metronome watch if you want.
They stop vibrate after 15 min - because to save battery life - but you just have to touch one button and it continue to vibrate.
You can have in on the arm or in your pocket.
IMHO you misunderstand me.
It’s as if someone is looking for a motor and people offer him a whole car.
What I need is only the small pulsing electronic part.
I have a VB pupil, he lives near the alps an alpinist, on one tour his toes
were chilled through.
So he needs the tactile switch for the fingers.
I found a very small tactile switch , for 0,45 Euro
near my home.
Now I want to connect the switch by a wire with the small pulsing part.
We found out that the best place for this tool is eighter at the neck near the wishbone under the shirt.
or under the armpit.
And the switch at the beginning of the pocket of his pants.
The best would be one switch at every pocket.
Now he uses the big pulsing metronome above in his pocket.