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?
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?
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.
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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