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I crack open a punchy little toy, show how the original just squishes two contacts to light the eye LEDs off a pair of LR41s, then perform some brain surgery to cram in a tiny lithium cell and my own board that triggers lights—and an incredibly annoying tune—on each punch. It sips about 7 µA in deep sleep and wakes via a yellow trigger wire, but the soldering was fiddly and full of swearing. Tape it up, cram it back in the head, and yes, it works a treat… maybe too well, because the beeping is driving me mad.

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Transcript

So this is quite fun but a little bit
boring. This however is quite fun
but a little bit irritating.
It plays a little tune every time you
punch. How annoying is that going to be?
So let’s have a look at the previous
version and the one that I’ve applied
some brain surgery to. So, we can uh
prize open the head. I did open this
previously and used a bit of brute
force, not realizing that I only cared
about the head. It’s quite interesting
how it works. So, if you see in this
little slot here, every time I push the
arms up, it closes a circuit. Let’s do
it with the really annoying one just to
annoy you because it’s been annoying me
all this beeping. So, if we do that, it
closes a circuit. And in the old
version, that just lights up the um LEDs
in the eyes. So, let’s open this up.
So it is remarkably simple. So all we
have are some little coin cell
batteries. There’s two of them in here.
And then we have these two connectors
that go into the body. So one of them
goes to little top connector and the
other goes to the bottom connector. And
those just get squished together and
complete the circuit. So the two LEDs
are in parallel. Um let’s see what these
batteries are. I’ve got got a couple
here. I can get them out. Seem to be
wrapped in some plastic. Come out here
little batteries.
There we go.
Two coin cell batteries. So, I will uh
what are these
LR41s?
There you go. So, two two LR41s.
So, yeah. So, it’s pretty simple. Um,
closes the circuit and the LEDs light
up. It is quite uh quite sensitive to
where the head is. Um, so that’s uh
interesting. Let’s look at the uh the
one that I’ve done the brain surgery to.
So, I’ll spend a bit of time wiring this
up. It was quite fiddly. So, I will
spare you the trauma of all of the
swearing and the wiring up. And let’s
see if we can extract. It’s gone off
again. Extract the brains.
[Music]
So there we go. So we have a very small
lithium cell that’s powering the whole
thing. I was originally going to try and
power it off um one of these coin cells,
which would just about fit in the brain,
but um in the end, I wanted more volume.
So more volume for even more annoyance.
So we have that little cell. We have the
two power wires from the cell powering
my little um my little board and then
that has two wires. So, one of them goes
to this connector here and then that
goes through the body out to this yellow
wire which is used to trigger the the
music. So, this goes into very deep
sleep mode. Draws about seven micro amps
in deep sleep. And then we just have the
resistor off to the two LEDs. So, we get
the nice LEDs lighting up as well as the
terribly annoying music.
So, pretty simple really, but quite
fiddly to solder up with these uh small
wires. And gosh, it really does go on,
doesn’t it? Um maybe I’ll choose a
different tune next time. Then anyway,
we I’ll put some tape here just to
insulate everything so we don’t uh don’t
do any short circuits. Then you just
cram everything in. Gosh, shut up. And
then we can just close the uh close the
head and just squeezes together like
that. So yeah, pretty simple. Um in
theory this would last a very long time.
So you too could have an annoying thing.
I think I might uh might have to go back
to the original non-anoying version
because uh these beeps do get to you
after a while.
[Music]
[Music]
[Music]


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Chris Greening

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atomic14

A collection of slightly mad projects, instructive/educational videos, and generally interesting stuff. Building projects around the Arduino and ESP32 platforms - we'll be exploring AI, Computer Vision, Audio, 3D Printing - it may get a bit eclectic...

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