1.5V power supply for mp3 player - diyAudio
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Old 16th October 2005, 11:08 AM   #1
leo14m3 is offline leo14m3  Romania
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Join Date: Oct 2003
Location: Braila
Default 1.5V power supply for mp3 player

I have an mp3 player with memory, wich uses a R3 (AAA) power baterry. It also works fine with AAA NiMH rechargeable battery 1.2V/850mAh.
My problem: I want to use an external power supply delivering 1.5V 200mA. My player does not start when connecting 1.5V external supply.
I tried with a linear variable power source 1.5-20V / 1A with LM317 and then a switching mode power supply with MC34063. The player did not start.
The filtering capacitor was 0.1F/5.5V, much more than needed, I suppose.
Where could be the problem?
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Old 16th October 2005, 12:37 PM   #2
djQUAN is offline djQUAN  Philippines
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is your filtering capacitor physically small or large?

if it is small, then it may be a super cap which is not meant to filter any ripple. get a proper electrolytic cap.

super caps have very large values for small size but they cannot put out large peak currents. they are designed to hold voltages for clocks or memories.
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Old 16th October 2005, 01:22 PM   #3
leo14m3 is offline leo14m3  Romania
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Join Date: Oct 2003
Location: Braila
You're right, was a super cap. I replaced with 4700uF and the display flashed. After few tries, the player started. With 15000uF, the player start with no problem. I realize that the player need much starting current.
Thank you for helping me.
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