Hardware MacGyvering
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@Polygeekery said in Hardware MacGyvering:
I have a bunch of 9V batteries in the garage
I haven't seen anything use them for decades, and the only device I remember was smoke detectors.
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@coldandtired said in Hardware MacGyvering:
@Polygeekery said in Hardware MacGyvering:
I have a bunch of 9V batteries in the garage
I haven't seen anything use them for decades, and the only device I remember was smoke detectors.
Do you have young kids?
I buy batteries in bulk at Costco.
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@Polygeekery I have young kids but almost every powered toy they've had used AAA. Occasionally AA or CR2032 or something.
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@coldandtired said in Hardware MacGyvering:
@Polygeekery said in Hardware MacGyvering:
I have a bunch of 9V batteries in the garage
I haven't seen anything use them for decades, and the only device I remember was smoke detectors.
Multimeters also use them a-plenty.
Also: If you have devices which need those tiny AAAA-batteries (like the pens for the Surfaces) then you might want to have a look if your 9V battery isn't simply 6 of those AAAA batteries wired serially and encased with foil. Not all of the 9V are, though.
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@Rhywden said in Hardware MacGyvering:
Sadly, I'm lacking a n=600 coil which would enable me to demo'ing high current transformations by melting an iron nail (the nail is coupled to a n=6 coil with massive copper wires). If I'm using an n=300 as a primary, the circuit breaker somewhat vehemently disagrees with me and the n=900 coil does not produce enough Ooomph to actually melt the nail, only bringing it to a (still impressive) orange-hot glow.
Ah, I remember that demo from my physics class.
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@PleegWat It's also how you can build a rudimentary Gauss Gun :)
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@Rhywden Is that the one where you drop a magnet into an electified coil?
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@PleegWat No need for a magnet. The "complicated" version would need several coils in a row with only the coil in front of the ferromagnetic (e.g. iron) bullet being magnetized, thus accelerating the bullet. It's complicated because the magnetization of the coils needs to be synchronized to the position and velocity of the bullet.
The easier version (which you can easily build yourself) needs a coil (say, n=300), an iron rod and a metal ring.
You put the iron rod into the opening of the coil to force the field lines to wander along the rod (you also strengthen the field by doing so). The rod also serves as a guide rail.
Then you put the metal ring over the rod. It should now rest on top of the coil.
As soon as you put current through the coil, you'll also induce a counter current in the metal ring (it is a transformer after all). Since the secondary coil is n=1, this counter current is huge. And because a current creates a magnetic field the ring will thus create a huge counter magnetic field which violently propels the ring upwards.
The ring will also be just a tiny bit hot afterwards. I recommend oven mittens.
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@Rhywden Hm, no, I don't think I've seen that one.
