Hi, guys. Welcome back to 52audio.
We published a short teardown video of the first DJI professional Mic a few days ago.
And today, we gonna analyze it in detail.
Firstly, let’s unbox it.
There’s a list of all items inside the box.
Except for the product, it also comes with a carrying pouch, two Mic windscreens,
(fixed by snap)
a 3.5mm camera audio cable, some documents, and USB-A to USB-C charging cable.
Next, let’s take a look at the charging case.
There are LED lights at the bottom.
And the USB-C port is on the back of charging case.
The DJI logo is in the center of the top.
The tech specs are printed at the bottom.
Model is ASB01.
Input is 5V3.5A, output is 5V0.5A.
And rated capacity is 1800mAh.
Open the charging case.
We can see two transmitters, a receiver, a USB-C adapter, and a Lightning adapter are inside.
And the display of the receiver can show the power and usage time.
Take out two transmitters, which adopt the same design as the charging case.
The headphone jack and Mic are on the top.
And the clamp on the back can be magnetically fixed.
So you can fix it on any metal surface.
The REC means “reconnect.”
The other button means “connect.”
The USB-C port and power button are on the other side.
And the green LED light is at the corner.
Those eight metal contacts are used for charging.
Next, we can see the receiver’s display can show different device info.
The power button and USB-C port are on the side.
Two headphone jacks are on the other side.
Four thick contacts on the right are used for charging.
And eight thin contacts are used for expansion.
Let me show you.
Here are USB-C adapter and Lightning adapter.
There’re metal contacts on the back.
Just insert it into the slot.
And you’re good to go.
The hot shoe adapter can also be fixed in the slot, which is a back clamp.
The corresponding contacts for charging are also inside the charging case.
And those contacts are used to charge the receiver and fixed with screws.
The overall weight of the charging case, receiver, transmitter, and two Mic windscreens is 263g (9.28 oz).
Except for the charging case,
the overall weight of transmitters, receiver, and Mic windscreens is about 98g (3.46 oz).
And the size of the charging case is about 103*62*42mm (4.06*2.44*1.65 inches).
Use CHARGERLAB POWER-Z KM002C to charge the charging case.
It’s about 10W.
The transmitter charging power is about 1W, while the receiver is 1.8W.
Then, let’s take it apart.
Start from the charging case.
There’s a thermal pad, used to dissipate heat.
Two metal blocks are on edge.
Two foams are on both sides of the LED light.
And then, the Hall element is fixed by screws.
LED light is actually fixed with UV glue.
This magnet is used to attract the lid.
The hinge is fixed on the back of the charging case with four screws.
Here is the battery connector on the PCB.
The red and black wires are positive and negative, and the yellow wire is connected to the thermistor.
Remove the screws.
Let’s take a closer look at the Hall element, which comes from Magntek MT8651.
Then, remove the PCB.
And take out the battery.
We can see the manufacturer is Springpower technology.
The battery model is P13248.
Rated capacity is 2600mAh/10Wh.
And rated voltage is 3.87V.
There are four magnets at the bottom of the chamber, which are also fixed by UV glue.
Here is the front of PCB, which is coated with protective lacquer.
And the pogo pins are on both sides.
Here is the heat sink.
The blue thermal adhesives between PCB and heat sink are also used to dissipate heat.
Here is the operational amplifier, which can provide superior performance for driving ADC
(analog-to-digital converters) without degradation of differential linearity.
And two MOSFETs come from Yangjie YJQ1216A, used for interface protection.
-20V, 17mΩ.
This tiny chip is the step-down IC for MCU.
And here is the 3A single-cell battery charger with high input voltage capability
and narrow voltage DC (NVDC) power path management.
Model is SGMicro SGM41511.
It integrates converters and switches.
So, it can support fast charging.
And it also integrates bootstrap diode for high-side gate drive,
which can reduce charging time and maximize discharge efficiency.
And the MCU comes from HDSC HC32F176, which can support wide-range voltage.
It integrates a high-precision SARADC, a 12-bit DAC,
different communication peripherals, and security modules.
Next, let’s take apart the transmitter.
The shell is fixed by clips and glue.
Here is the internal structure.
The buffer sponge is covered on the flat cable.
Remove the screws and separate the PCB.
A layer of foam is between the PCB and battery.
There is a vibration motor, which is protected by a special rubber cover.
The golden parts on both sides are Bluetooth antennas.
The power button is protected by a metal cover and fixed with UV glue.
Then, remove the rubber cover.
It can reduce the noise made by vibration motor.
This is the vibration motor.
The circle opening is used to collect sound.
And the MEMS microphone, marked with 120 BFC, is next to it.
There are metal protective covers for important components on the front and back of the PCB.
Tear off the battery label.
The thermistor is fixed on the battery with glue.
It shows the model is SP532125.
Capacity is 320mAh/1.232Wh,
and rated voltage is 3.85V.
Remove the metal cover, and let me introduce all the components.
The headphone jack is marked with 211022.
The green indicator light we’ve mentioned is next to the USB-C port.
There is another button on edge.
This is a linear lithium battery charging IC.
Model is Cellwise CW6305.
Those two MOSFETs are also from Yangjie, same model.
This part is used for Bluetooth connection.
Here is the Bluetooth 5 SOC, which integrates M4 core of 64MHz, 192KB Flash, and 24KB RAM.
Model is NORDIC nRF52810.
And this is the RF front end, used for Bluetooth signal amplification.
Model is SKYWORKS SKY66112.
Turn to back.
Here is the analog switch for switching between built-in and external microphones.
Model is SGMicro SGM3715.
And this is quad audio ADC, used for analog-to-digital conversion.
Model is Nuvoton NAU85L40YGB.
The largest chip is the 8G memory from SanDisk and is used for recording storage.
Another MCU from NXP is next to it.
It integrates a dual-core M33 processor of 300MHz, 4.5MB memory, and DSP core.
And the final part is the receiver.
The first thing we can see is a thermal pad, pasted to the shell.
Another thermal pad is in here.
Remove the BTB connector and screws.
And take out the PCB.
The internal structure is similar to the transmitter.
Take out the battery.
The golden part is also the Bluetooth antennas.
The battery label is the same as the transmitter.
Charging limit voltage is 4.4V.
Tear off the label.
We can find the battery is the same as the transmitter.
The thermistor is in here.
There are also protective metal covers on the front and back of the PCB.
Here is the same YangJie MOSFET as the transmitter.
And the charging IC from Cellwise is next to it, also the same.
The audio codec comes from Nuvoton NAU88L25B,
which is a cost-optimized solution for audio jack applications
that benefit from enhanced audio quality
and more integrated detection and suppression functions.
There’s also an analog switch for switching the audio signal.
Model is SGMicro SGM3715.
Those two MOSFETs also come from YangJie, same model.
And the RF front end is also the same as the transmitter, used for Bluetooth signal amplification.
The Bluetooth 5 SOC is also the same as the transmitter.
Turn to back, there’s another audio codec, which integrates ADC and DAC.
Model is Nuvoton NAU88L21YG.
It can support both analog and digital audio functions, and is used for playback.
The memory of receiver comes from GigaDevice GD25Q128E.
Only 16MB.
The MCU of receiver is also the same as the transmitter and comes from NXP,
used for machine control and status display.
Well, that’s all components of the first DJI professional Mic.
The charging case integrates a high-capacity battery of 2600mAh that can work for 15 hours.
The transmitter is equipped with magnets.
So, you can fix it on any metal surface.
The receiver is equipped with a display to show the device information.
And you can also use the expansion slot to connect it to your Android phone or iPhone.
So, its compatibility is pretty good.
The internal structure of the receiver and transmitter is almost the same.
Many components in those two parts are the same, such as Bluetooth 5 SOC, RF front end,
MCU, MOSFETs, analog switch, charging IC, etc.
Okay, that’s all for today’s video.
We spent a lot of time tearing down this complicated Mic.
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See you in the next video. Bye.