What Inside of BOSCA BS-905 Power Amplifier IC

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What is the power IC of BS-905?
Hello there, I buy this 4 channel 350W+350W with Bluetooth amplifier and i test to two 4ohms-8inch subwoofers and 2 satellite speaker, It gives a nice output very clear and good loud sound.
Its perfect for Videoke theater with balanced output.
This stuff is an Amplifier have a nice front design with two input microphone but the power switch is on the back housing and the MMC card-slot is for SD card not fit for TF card.
There is have 4 audio input L/R and 4CH output for a speaker at the back.
Also, there is 220v male socket and 12V DC input with printed of  DC12v5A for the car battery.
This can use in a home and car audio and multi-purpose amp, Let unbox it and share to all what is inside..

Printed Specs
Bosca BS-905 Power Amplifier 350W+350W with Bluetooth
2 Mic Input
Power on/off switch on back
4 Channel Speaker Output
Audio Input FM Antenna
USB LCD Display
USB/SD/FM/Bluetooth Audio Stereo
Remote control
Mic Volume , Mic Input
Treble control knob
Bass control knob
Supply Power (DC-12V) and (AC-220V) Input
Speaker Out Protection
4 Channel output speaker
Lenght = 20cm
Width = 14.5cm
Height = 6cm

What is the power IC of BS-905?

OK LETs UNBOX this STUFF

I take a screenshot picture after I unboxed this AMP to know more and maybe want to know also that's why you are here my blogs ^_^.
The motherboard PCB design of BS-905 is similar to the BS-903 motherboard but the PCB chipset reader was not the same.

PCB Chipset reader motherboard is solder parallel to another PCB.
There is the same transformer have14VAC.
I found there is a 3 PCB board Chipset Reader, Power amp, and Control button section.

There is have 2 mic socket and pre-amp on board. Chipset reader can hold the selection mode of the input signal which it is a MP3, FM, Bluetooth, input from external will load to PREAMP.
Pre-amp IC printed indicate name is RC4558D, This is amplifying a signal and pass to the tone control and volume then pass to the two Power Amp IC let see fig.below.




TDA7297 standard Schematic diagram


Unlike similar to BS-903 model, There is a Two power amp this BS-905 model.
Power Amp IC output pass to the connector of speaker at the back.
Hey! you want to know what Power amp inside this stuff? , Let see figure below..


The IC printed indicated name is TDA7297 is a dual bridge amplifier each which output is RMS.

TDA7297 Spec.
- WIDE SUPPLY VOLTAGE RANGE (6V -18V)
- MINIMUM EXTERNAL COMPONENTS
– NO SVR CAPACITOR
– NO BOOTSTRAP
– NO BOUCHEROT CELLS
– INTERNALLY FIXED GAIN
- STAND-BY & MUTE FUNCTIONS
- SHORT CIRCUIT PROTECTION
- THERMAL OVERLOAD PROTECTION

I found the two power amp IC on a big aluminum heat sink with a printed name is TDA7297.
It can drive the amplified signal from IC-4558D per channel.
The Left channel signal ic connected 1 TDA7297 which become 2 output L/R speaker connector and FL/FR is connected to another 1 TDA7297 which result in a loud sound 4 channel output connector because of 2 IC.


Optional: if you have own this model you can upgrade the ic to TDA7379 which is double output power rather than TDA7297. it same circuit printed board and pins i test it already

Check the price of Bosca BS905 below...

LazadaPH Bosca Shop - Bosca shop BS-905
ShopeePH - Bosca BS-905
DOWNLOAD - PDF AND BS-905 UNBOX ALL PICTURE

Check this other Bosca Amplifier model


UNBOXING VIDEOS

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