This seems unique vs bluetooth or hardwire. You are the only channel I have seen that analyzes the chip by decaping it. That is truly a teardown vs someone opening a box and babbling about the sustainability of the packing materials.

Today in Silicon Chip magazine I read about a kit project "An incredibly sensitive Magnetometer" to build which also used two transformers connected together as was shown here.

Fascinating. Never knew such devices existed, and as always a real treat to peek inside the package.

Not a stereo pickup but simply because various manufacturers place the speakers in different locations, so having 2 pickups means your chances of being near the speaker on all phones is very high. Speaker on the end of the phone simply because it is far enough away from the microphone so they can do noise cancellation easier, and in the corner because they need the middle space for processing chips and display connectors. Would guess this would work with the phone as a cheap speakerphone booster as well.

@publicmail2

5 жыл бұрын

Yes of course being in series it's a monoral pickup.

Nice video, thanks for finally going through the silicon details!

I like the way you say battery.

Very cool idea. Skipping the cable and just grabbing the electrical signal right out of the air.

Thank you, keep on going

What a clever product. Kudos to the designer of such a cheap and clever product.

Well, I guess you're the man to ask this question to. Have you have seen a manufacturer integrate any significant inductor into the die itself, or even into the spare space in the package? I'm hunting for _truly_ monolithic, tiny switching power supplies and can't seem to find anything that doesn't require support components.

That Nokia battery powers my cell phone! I have to remind myself every once in a while to plug it in and give it some juice!

Why did they even invented this??? Is it because recent phones ditched the 3.5mm jack?

@publicmail2

5 жыл бұрын

Money, sales, don't forget bluetooth.

Normal transformer does not (or almost not) pick-up magnetic field! May be with an open end?

I'm wondering...a bigger speaker, more powerful circuitry and configuration, bigger sound amplification? Home theater level?

Nice video

Two points i like: Using an off-the-shelf Nokia clone-battery: Good! - Dual-duty battery holder - COOL! - I wonder what happens if you insert both kind of batteries at once? :D

@SianaGearz

5 жыл бұрын

3 strategically placed diodes on the board makes me think they thought of everything, that things won't explode if you plug in USB, Li-Ion battery and 3xAAA batteries all at the same time. However i suspect there is also mechanical lockout that once AAA batteries are in, you should be unable to insert a Nokia battery. There is also what looks like a SOT-23-5 battery charger IC there and a SOT-223 linear regulator near the AAA battery input.

Since this thing has a oscillator on board, aren't these caps for creating the oscillation?

Does that cellphone battery have the protection circuitry under the tabs like the real ones?

Is that a small phone or is his hands really big?

www.chipstar-ic.com Looks like they make amplifiers. So the shenzhen company is just rebadging it looks like, or they just licensed the design.