Covert radio pen with bone conduction speaker----make money online

today on Applied Science I'd like to

talk about this a ballpoint pen into

which I've built a radio and a bone

conduction speaker so that when I bite

down on a speaker part of the pen I can

hear the audio from the radio like this

also I'd like to let you know that I

signed up with patreon comm and this

will allow you to make donations to my

channel on a per video basis so I'll

probably do a Q&A; session later and

answer more of your questions about that

but feel free to check out the link in

the description to donate as the name

implies bone conduction means that the

sound waves originate at the speaker

here and instead of traveling through

the air into your ear they actually

travel through the skull into the

cochlea the part of the ear that that

senses sound so since I can't reach

through the computer and put this up to

your skull the next best thing in order

to demonstrate it is to push the bone

conduction speaker up against the

camera's microphone and when I was just

demonstrating this thing I was only

holding the bone conduction speaker

about a centimeter away from the

microphone when it was off and was in

contact when the sound was on and as you

probably heard the difference is

actually quite significant I built this

bone conduction speaker by taking a

piezo transducer disc like this and

cutting it into a strip and then putting

the strip into the back part of this

ballpoint pen the button of the

ballpoint pen and encasing it in epoxy

so I basically put the strip in here and

then filled this up with two-part epoxy

and let it cure and that's that's how

this one is built to the one that I was

demonstrating I cheated a little bit and

since I haven't actually built all these

elements into the pen but they're all

functional and what you heard was

actually the system working however the

other parts of this system are a tiny FM

radio a couple of batteries and an

impedance matching transformer to

convert the headphone output of this

tiny FM radio to a much higher impedance

that can drive the piezo transducer this

kind of shows how dated I am when I

first thought about this project I

instantly thought about

these tiny FM radio chips the entire

radio is essentially one I see with some

you know supporting components in an

amplifier for the headphones of course I

was thinking of actually doing this

project as kind of a side business or at

least thinking about in terms of a

product and what would make a whole lot

more sense is to start with a Bluetooth

earphone and build this into the pen so

that when you pair it with a cell phone

in your pocket for example you could you

know feel the phone ring and then maybe

press a button on the pen to answer the

call and then hold this up to your tooth

and actually have sort of a covert

listening situation and you know about a

$20 product after thinking about use

cases for this thing it seemed like the

killer app would basically be cheating

on tests you know you're already holding

a pen and no one would be suspicious if

you were absent mindedly chewing on the

back of the pen and yet you could have

like a you know a pretty good audio

stream going right into your ears anyway

I decided to pass on this business idea

which is so why I'm making a video about

it now in the usual course of

researching a business idea you try to

find products that are similar maybe

even the same as the idea that you're

currently considering so I searched

around for bone conduction pens or your

phones or anything like that that would

be have covert listening in mind and I

couldn't find anything but my friend

Travis did you remembered this thing

that came out quite a while ago

I guess when Toy Story 2 came out and

it's a lollipop that uses bone

conduction and when you press one of

these buttons it emits a sound effect

and if your if the lollipop is in your

mouth or you're hitting one of your

teeth you get this kind of bone

conduction effect where it wires the

sound kind of right into your ear

so of course eBay has these and so I

bought one or two they're pretty cheap

and took one apart and these guys did

not use a piezo element it's actually a

standard magnet and coil driven speaker

element and they've kind of added some

structural stuff to it so that when you

Jam a lollipop in here and you push on

it it doesn't break the speaker like it

basically has some molded plastic limits

in here so that even with the

we pop in here and you biting on it as

hard as you can it's not likely you're

going to break the speaker element but

this raises an interesting point why

they chose to go with a speaker you know

a conventional coil and magnet type

actuator instead of piezo and I

mentioned impedance matching is critical

for this thing and I showed this little

impedance match transformer so I hit

upon impedance matching in my last video

and when you have a small

battery-powered device like this it's

not easy to generate a high voltage you

know this one only has two button cells

so this is limited to three volts here

and the if you put three volts across

one of these piezo elements it doesn't

do very much it's not going to move very

far so if this transformer does is takes

the low voltage drive that would

normally be sufficient for a coil and

magnet type actuator and steps up the

voltage and steps down the current so

that it matches better with the high

impedance required by the piezo element

and I searched for the the highest ratio

smallest matching transformer that I

could find on digi-key and this is

almost good enough it's kind of a little

bit too big for a pen body but to

demonstrate the effect it was fine you

can think of these piezo transducers as

sort of an electrically leaky capacitor

so normally a perfect capacitor will

accept energy from your circuit and then

you can pull that same amount of energy

back out if everything is perfect but

these transducers actually can do work

so if you put a certain amount of energy

in there you may not get the same energy

back out even though it functions like a

capacitor that energy is actually

leaving the system in the form of sound

pressure waves this means that at DC

their impedance is essentially infinite

so if we just put voltage across this

piezo element and hold it there nothing

nothing will happen it's basically just

functions like a regular capacitor but

if we feed it a an alternating voltage

then the thing expands and contracts and

that's when we can get this energy loss

to happen or this energy transfer where

the electrical energy is converted into

mechanical work typically the voltages

have to be quite high to make this thing

do anything use

although so in this case the little

impedance matching transformer that I

was using was accepting something on the

order of three volts you know a couple

volts from that tiny battery-powered

circuit and outputting something in the

range of 20 to 50 volts

however these piezo transducers are

generally built to handle something in

the hundreds of volts range so the more

voltage that means the more this little

transducer is going to expand or

contract and that means we get higher

amplitude sound out of it

I actually didn't notice this until a

minute ago but the manufacturer claims

they're in the guinness book of world

records for world's most interactive

candy of 1999 I can only imagine what

the competitors to that title had for

their products another one of my friends

had the idea of building this bone

conduction system into a Camelback

mouthpiece so if you're out hiking or

surfing or skiing or whatever it's not

very convenient to have headphones on

because you know the environment is just

not very good for that if you had it in

the mouthpiece of this water backpack

you could very easily answer a call if

you had a you know a waterproof phone I

guess and bite down on it and sort of

hear through that it might be an easier

way to to have a call in that sort of

environment I thought that was one

application that was probably better

than cheating on tests but beyond that I

really couldn't come up with much else

so let me know what you think do you

have a killer app for this tech okay see

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