Go Down

Topic: [SOLVED] by8001 - Standby mode - Speaker consums 300mA (Read 149 times) previous topic - next topic


Sep 25, 2016, 01:07 pm Last Edit: Sep 27, 2016, 07:39 pm by tahitibob35
I just received the BY8001 MP3 player.
I connected a speaker (8ohms, 1A).
When I switch the module to the standby mode, the module still consums 300mA.
When I disconnect the speaker, the module consums 3mA.

Do You know if I can add a P2N2222A transistor to power off the speaker ?
Is there any other solution ?

Thanks !


Sounds like you need a big capacitor in seriese with your speaker to remove any DC component through the speaker.



Sep 26, 2016, 07:57 pm Last Edit: Sep 26, 2016, 07:58 pm by Grumpy_Mike
Could You explain this please ?
I though I had done?

If the module draws more current with the speaker attached but no sound being produced then there must be a DC path through the speaker. This is bad because:-
1) Speakers don't like DC through them and it can damage them.
2) You are using current for no reason.

Therefore to stop DC going through the speaker you put a large capacitor in series with the speaker. This blocks any DC but still lets the audio through. This is called AC coupling. I am surprised it was not already included in the amplifier but there is all sorts of crap about these days.


I like to understand what I do.
Which capacitor value ?
Thanks for explainations !


Sep 26, 2016, 08:08 pm Last Edit: Sep 26, 2016, 08:08 pm by Grumpy_Mike
Which capacitor value ?
Anything from 100uF to 10000uF.
The bigger the capacitor the better the low frequency response. Put the +ve end of the capacitor to the amplifier output and the -ve end to the speaker. I assume the other end of the speaker goes to ground.


I didn't correctly the documentation.
I connected the speaker between SPK1 and GND.
This is wrong.
Now, the speaker is connected between SPK1 and SPK2 :
50mA when playing
10mA in standby mode

Thanks !

Go Up

Please enter a valid email to subscribe

Confirm your email address

We need to confirm your email address.
To complete the subscription, please click the link in the email we just sent you.

Thank you for subscribing!

via Egeo 16
Torino, 10131