China made Wireless Speakers - 5

I purchased this even I knew that it did not work, solely for the purpose of checking inside.

I already destroyed four similar no brand (generic) China made Wireless (Bluetooth) Speakers. So I am a bit familiar with the inside.

1. JL or JC logo (highlu likely JL or Jie Li (Technology)

https://www.hkstp.org/en/directory-list/Details/jieli-technology-hong-kong-co-limited

Part No. AC1513CF9J0T. 1- 06BT  -   Bluetooth + MP3 + etc function

I have found this JL brand IC before and introduced in China made Wireless Speakers - 2.

28 pin IC: ACCFCV56.1-07ABT

2. RDA5876 (RDA brand)  -  Bluetooth and FM Radio Chip
 (RDA was purchased by a Chinese company called "Tsinghua Unigroup")

I cannot find radio function in this mini speaker.

I have found this RDA brand IC before and introduced in China made Wireless Speakers - 2.

RDA5876: I found the spec of RDA5876P - SINGLE CHIP FOR BLUETOOTH & FM RADIO TUNE

3. 25080xxxxxx with white paint (this white paint may have some meanings)  - Flash memory

4. KDC8002 - Audio Amp   KDC brand cannot be identified.

5. L 26.000MHz Oscillator

6. One <potentiometer +  switch>  like mechanical device (which seems broken) is connected to this Audio Amp.

7. Slide switch

8.  TF (SD) card connector

9. LED

10. Microphone

11.  4 Ohm 3W speaker

12. Li-Ion Battery  still charged (showing 1.7V) - surprised me.  Then what's wrong with this mini speaker.


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China made Wireless Speakers - 4

I opened or destroyed  my LED Music Bulb to check the inside. Even after destroying it still works well, making colorful light and sound. The inside is compact, Power supply board, Control board and LED board and speaker. As this is operated by Remote Control no switches are found, which make these compact in addition to using several ICs.

Since the power is AC main like a common bulb it needs to change it to DC.  I know a power supply being important but I skip it this time. Just it uses the following parts:

Switching Power Supply board

1) one Diode Bridge MB8S (On Semi ?)
2) one AC-DC Converter (SPT) SP5626P (Westech Power, China)
3) one Photocoupler CT 357C (CT Micro, China)
4) one relatively big yellow one is a switching transformer with no name
5) one 10uF 400V DC Electrolytic Capacitor (E Cap) (ChengX brand)
6) two 100uF 50V E Caps (ChengX brand)
7) one 22uF 50V E Cap (ChengX brand)
8) one Choke Coil
9) one Diode SF M1C
10) one Film Capacitor 2J102
11) one Metal Oxide Film Resistor
12) two MLCCs
13) several Chip Resistors

Control board 

1) IC  C7THN48129 (1710NRZ-11D) 28-pin Blue tooth and audio, etc function (Brand name (*))
2) FT25H04S (Fremont Micro Devices, China) 4M-bit/2M-bit Serial Flash for program stored
3) 26.000MHz Oscillator
4) ANT8108 SOP8 Audio Amp for the 3W speaker (ShenZhen ChipSourceTek)
5) HXN e2719E (DC-DC Converter) for LED power supply ?
6 ) one SOT89 Transistor D882 (probably SHIKE,China)
7) one 1000uF/10V, one 470uF/10V, one 22uF/50V E Caps (all ChengX brand)
8) one Peaking Coil
9) three SMT (SOT-23) Transistors (S8050 - mark on chip J3Y)
10) many chip resistors and MLCC

(*) The band name is unknown, not identified but I can find this logo on the internet advertisement with similar part numbers.

(After re-checking this logo seems to belong to the company called "AppoTech" and they have some more different rather many Bluetooth + Audio ICs)


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China made Wireless Speakers - 3

This distinctive curvy shape with a speaker protection metal net becomes more distinctive and humorous without the net. The sound quality is not good so I seldom used after purchase. It has FM radio function. It announces by pressing the M(ode) button "Bluetooth mode" , "AUX mode" and "Radio mode" but it has no AUX jack. As the battery has reached its life and Radio Scanning seems to have a problem I opened it without regret.


Inside

 It has the places for two speakers but actually only one real speaker (4 Ohm 3W) and the other is fake or just a vibration plate (orange).

ICs

1) QFP 48p

The part shows a part number like <15190  DSTH509041>. I cannot identify this part on the internet. The green paint on the part may have some meaning.

This logo is also found  in the product introduced in China made Wireless Speakers - 1.

2) 6218 (SOP8)

This is supposed to be RTC6218 (Taiwan Richwave brand) - FM Tuner. The Richwave spec says:

The RTC6218 (RL508) is a single-chip broadcast FM stereo radio tuner with fully integrated building blocks as LNA, VCO with digital synthesizer, digital channel selection filter, digital FM demodulator and MPX decoder. The RL508 integrates the tuner function from antenna input to stereo audio output for worldwide European, US, Japanese and China FM bands. The FM tuner only requires a minimum amount of small and low cost external components to be a very attractive solution for portable devices. With a powerful audio engine, the RL508 is able to deliver optimum sound quality under hostile channel conditions.

3) PV25F04 (SOP8)

Paragon Brand Flash Memory.

4) Audio Amp (SOP 8)

No part number shown or erased naturally or intentionally.


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China made Wireless Speakers - 2

It says - BLUETOOTH  SUPER BASS PORTABLE SPEAKER. This wireless speaker has a good deign and enough heavy weight for staying on a table and has worked well for about three years under very light use (seldom used).  The sound quality is good. But it reached the battery life and no re-charging can be made though it announces "Please charge".  I liked it but decided to open it.

When I purchased this it is bare has no box usually showing technical specifications. The operating side (bottom) shows a very brief spec. It says

Working Voltage 3.7V

Frequency Range:  60Hz -18KHz

Charging Voltage: 5V

Power: 3W

Inside:

1) 28 pin IC: ACCFCV56.1-07ABT

I cannot identify this on the internet. Logo seems <JL> or <JC> (*).

2) RDA5876: I found the spec of RDA5876P - SINGLE CHIP FOR BLUETOOTH & FM RADIO TUNER.

3) (MD BX1511) MD25D80S1G: I found the following on the China internet.
SPI NOR: MD25D80SIG 8Mbit 1MB SOP8

SPI is not the brand name but stands for Serial Peripheral Interface.

4) LTK9902B SOP8 - Audio Amp 3W (same　as the previous report　‐China made Wireless Speakers - 1)


I plan to change the battery as I have some stock.

--------

<JL> or <JC> (*)

After re-checking I found <JieLi Ttechnology> use this logo <JL>.
http://www.zh-jieli.com

However, I am not sure right now if the above 28 pin IC: ACCFCV56.1-07ABT belongs to this company or not.


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China made Wireless Speakers -1

I have many small no brand or generic (highly likely) China made wireless speakers. The one shown in the photos is the best one among them in terms of sound quality. After very light use of about two years it become not to work at all not because of the battery life. So I opened it to see what happened. The PCB is surprisingly small, neat and light in weigh (only 11grams) due to the use of ICs while the others, mostly heavy two speakers and the tough housing combined weigh 350grams, heavy enough to be stable during making sound.

The price tag HK$60 (US$7.70)

The box says

Music Wireless Speaker
MEGABASS
A2DP STEREO

Technical Specifications:

Audio port: TF/USB//AUX
Speaker: Double speakers 4 Ohm 3W, dia 40mm
FM Frequency Range: 87.5- 108MHz
Frequency Response" 100Hz - 16KHz
Battery: 3.7V 1800mAh Lithium battery

It has a microphone as shown in the photo.

ICs inside


























1) 28 pin IC AD9N553-31A near the oscillator (JF26.000) and Bluetooth antenna.
I tried but was not able to identify this IC on the internet though I found this logo on some other parts also on the internet.

(I cannot check so I am not sure but probably the problem of no function is due to this IC.)

2) Audio Amp IC: LTK8020D SOP8 (2pcs)

3) Flash Memory: MK25Q40ATIG  SOP8(Miake ? brand)

4) Single Chip Broadcast FM Radio Tuner IC: 5807MS (RDA5807MS)

As I have many small low cost wireless (bluetooth) speakers this title post will continue to find some things.

PCB has a microphone as seen in the photos. It may be used for "hands free" function. Some other more detailed specs are found on the internet like the one shown below.

Specifications:
• Support phone/ laptop/ Tablet PC
• Support USB/TF Card Slot, Support MP3 Format (TF card is not included)
• Modular buddy-jackdesign: connect a row of mini speakers to get jawdraopping audio performance
• Expanded bxs (Bass Expansion system) drives a  fuller, richer low-end response
• New, larger 45mm driver delivers precise high for super sound
• Built-in Microphone
• Built-in FM Radio
• Bluetooth Function
• Hands Free Call Feature
• Rechargeable Lithium Battery
• Audio Devices with 3.5mm Stereo Jack input
• Interface: USB + 3.5 mm audio interface
• Bluetooth version: V2.1
• Operation Range: up to 10m
• Color: Black,red,blue,green,orange.
• Packing: Neutral English box packaging

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