What inside of BOSCA BS-903 Power IC UNBOXED
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What is the Power IC of BS-903?
This stuff is an Amplifier can use in a home and car audio and multi-purpose amplifier.
There is Main volume, Tone control, Mic volume (no echo volume), power ON/Off control on front see the Fig1.
Also, there was a Rectangular LCD display which shows the USB, TF, FM, Bluetooth mode selection as control by 4 button player.
There are a 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 battery I think.
Fig.1
Hello there, I buy this 4 channel 350W+350W with Bluetooth amplifier and i test to(2) 4ohm 8" subwoofer and 2 satellite normal speaker.
It give a loud output sound, very clear and good balance perfect for Videoke theater.
Details of Bosca BS-903 Audio Power Amplifier 350W+350W with Bluetooth
OK Let's UNBOX THESE STUFF
I take a screenshot picture after i unboxed this gadget to know more and maybe want you know also that's why you are here my blogs ^_^.
I found there is a transformer 14vac, chipset Reader PCB, and pre-amp on board.
Chipset reader PCB combo is can hold the selection mode of the input signal which if is an MP3, FM, Bluetooth, or input and pass to PREAMP.
Pre-amp IC print name indicated is RC4558D.
Preamp amplified a signal will pass to the tone control and volume then pass again to the two Power Amp IC let see fig.2
Fig.2
Power Amp IC output pass to the connector of the speaker at the back housing.
Hey! you want to know what Power amp inside this stuff? , Let see fig.3
Fig.3
The IC printed name indicated of this stuff is TDA7297 is a dual bridge amplifier.
Specification
- 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 in 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 FR/FL speaker connector and L/R is connected to another 1 TDA7297,
Result loud output because of 2 IC.
DOWNLOAD PDF AND FULL UNBOX PICTURE BS-903
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, You can search it at home page search menu about the TDA7379.
Check This Bosca BS903 Price at link below
LazadaPH Bosca Shop - Bosca shop
ShopeePH - Bosca BS-903
Alibaba - Alibaba Home
Check this other Bosca Amplifier model
This stuff is an Amplifier can use in a home and car audio and multi-purpose amplifier.
There is Main volume, Tone control, Mic volume (no echo volume), power ON/Off control on front see the Fig1.
Also, there was a Rectangular LCD display which shows the USB, TF, FM, Bluetooth mode selection as control by 4 button player.
There are a 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 battery I think.
Fig.1
Hello there, I buy this 4 channel 350W+350W with Bluetooth amplifier and i test to(2) 4ohm 8" subwoofer and 2 satellite normal speaker.
It give a loud output sound, very clear and good balance perfect for Videoke theater.
Details of Bosca BS-903 Audio Power Amplifier 350W+350W with Bluetooth
- USB LCD Display
- USB/SD/FM/Bluetooth Audio Stereo
- Remote control
- Power on/off Switch
- Mic Volume, Mic Input
- Treble control knob
- Bass control knob
- Master volume knob
- Supply Power (DC-12V) and (AC-220V) Input
- Speaker Out Protection
- 4 Channel output speaker
- Length = 20cm
- Width = 12.5cm
- Height = 7cm
OK Let's UNBOX THESE STUFF
I take a screenshot picture after i unboxed this gadget to know more and maybe want you know also that's why you are here my blogs ^_^.
I found there is a transformer 14vac, chipset Reader PCB, and pre-amp on board.
Chipset reader PCB combo is can hold the selection mode of the input signal which if is an MP3, FM, Bluetooth, or input and pass to PREAMP.
Pre-amp IC print name indicated is RC4558D.
Preamp amplified a signal will pass to the tone control and volume then pass again to the two Power Amp IC let see fig.2
Fig.2
Power Amp IC output pass to the connector of the speaker at the back housing.
Hey! you want to know what Power amp inside this stuff? , Let see fig.3
Fig.3
The IC printed name indicated of this stuff is TDA7297 is a dual bridge amplifier.
Specification
- 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 in 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 FR/FL speaker connector and L/R is connected to another 1 TDA7297,
Result loud output because of 2 IC.
DOWNLOAD PDF AND FULL UNBOX PICTURE BS-903
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, You can search it at home page search menu about the TDA7379.
Check This Bosca BS903 Price at link below
LazadaPH Bosca Shop - Bosca shop
ShopeePH - Bosca BS-903
Alibaba - Alibaba Home
Check this other Bosca Amplifier model
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