Hello,
I am new to electronics but am really enjoying it. I apologise in advance for my idiotic questions, and look forward to any advice you can give...
I am trying to continuously run an 1.5v mp3 player with a tiny speaker connected to the headphone output. I have tested this with a multimeter and it looks to me like it needs 90ma to run.
I have a solar panel I pulled out of an old maplin solar battery charger. I cannot find a datasheet for the panel, but it has #907-150-7v written on it. I am assuming this means it has 7volt and 150 ma output.
I have connected this via a 4001 diode to a 2 x AAA rechargeable battery pack.
This is then connected through a LM317T circuit to give the 1.5v required to the MP3 player.
With freshly charged batteries in the batt pack it runs fine. However I left the MP3 player TURNED OFF for a day to top up the batts before I tried seeing how long it would last playing through the speaker.
It was pretty cloudy for the day so I assumed my batts would be about the same as when I left them , maybe a little bit more charged. But they were flat??
I have checked my circuit. Diode is correct way round...etc.
Does the LM317 drain power through heat like this ??
Is this ever going to work anyway ?
Does anyone have a better way of doing this?
Many Thanks, any help gratefully recieved!!
Bob
I am new to electronics but am really enjoying it. I apologise in advance for my idiotic questions, and look forward to any advice you can give...
I am trying to continuously run an 1.5v mp3 player with a tiny speaker connected to the headphone output. I have tested this with a multimeter and it looks to me like it needs 90ma to run.
I have a solar panel I pulled out of an old maplin solar battery charger. I cannot find a datasheet for the panel, but it has #907-150-7v written on it. I am assuming this means it has 7volt and 150 ma output.
I have connected this via a 4001 diode to a 2 x AAA rechargeable battery pack.
This is then connected through a LM317T circuit to give the 1.5v required to the MP3 player.
With freshly charged batteries in the batt pack it runs fine. However I left the MP3 player TURNED OFF for a day to top up the batts before I tried seeing how long it would last playing through the speaker.
It was pretty cloudy for the day so I assumed my batts would be about the same as when I left them , maybe a little bit more charged. But they were flat??
I have checked my circuit. Diode is correct way round...etc.
Does the LM317 drain power through heat like this ??
Is this ever going to work anyway ?
Does anyone have a better way of doing this?
Many Thanks, any help gratefully recieved!!
Bob