Hello,
I have made a MP3 player by putting together few modules namely,
a MP3 module which plays from SD card with onboard amplifier
https://robu.in/product/gpd2846a-tf-card-mp3-decoder-board-2w-amplifier-module/
a 18650 battery with charging and protection module
https://robu.in/product/tp4056-1a-lipo-battery-charging-board-micro-usb-with-current-protection/
a voltage boost module to boost the battery voltage to 5 volts
https://robu.in/product/mt3608-2a-max-dc-dc-step-power-module-booster-power-module/
and a speaker - 8ohms 5Watt.
As per the MP3 module spec, it has a 2w amplifier.
The mp3 player works fine for moderate volume when the charge in battery is high (above 3 volts).
If the battery voltage becomes 3 volts, it works for only very low volumes. Increasing the volume creates a trrrrrrr sound in speaker and the module resets (this goes in a loop unless you lower the sound further).
I have few questions :
1. When the battery voltage is above 3 volts, its mostly usable. However, cannot reach max volume. The same problem happens (speaker chatter and module reset).
2. when the battery voltage goes to 3 volts and below, you should use it at very low volumes.
What is the problem here? which component should I try to replace or add ?
I have suspicions on the boost circuit. But I tried to check the output voltage of the circuit with Multimeter (unfortunately I don't have a scope) and its voltage remains constant (5v) when the speaker chatter happens and the mp3 module resets.
Thanks.
I have made a MP3 player by putting together few modules namely,
a MP3 module which plays from SD card with onboard amplifier
https://robu.in/product/gpd2846a-tf-card-mp3-decoder-board-2w-amplifier-module/
a 18650 battery with charging and protection module
https://robu.in/product/tp4056-1a-lipo-battery-charging-board-micro-usb-with-current-protection/
a voltage boost module to boost the battery voltage to 5 volts
https://robu.in/product/mt3608-2a-max-dc-dc-step-power-module-booster-power-module/
and a speaker - 8ohms 5Watt.
As per the MP3 module spec, it has a 2w amplifier.
The mp3 player works fine for moderate volume when the charge in battery is high (above 3 volts).
If the battery voltage becomes 3 volts, it works for only very low volumes. Increasing the volume creates a trrrrrrr sound in speaker and the module resets (this goes in a loop unless you lower the sound further).
I have few questions :
1. When the battery voltage is above 3 volts, its mostly usable. However, cannot reach max volume. The same problem happens (speaker chatter and module reset).
2. when the battery voltage goes to 3 volts and below, you should use it at very low volumes.
What is the problem here? which component should I try to replace or add ?
I have suspicions on the boost circuit. But I tried to check the output voltage of the circuit with Multimeter (unfortunately I don't have a scope) and its voltage remains constant (5v) when the speaker chatter happens and the mp3 module resets.
Thanks.