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.


sptt