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MP3 + Speak alternative power supply??? Answered



I have posted this this in 'Kids' forum also, I hope that is ok?

MP3 Bedtime Stories ..... Battery 


Hi, new here so please bare with me.....long story cut short.

My Grandson is five years old and I thought it would be great, and get him to sleep quicker at night, if I could come up with some method of playing MP3 stories. I know, CD player, etc. nope, at five years old they want to take EVERYTHING apart. So no mains leads, CDs, etc.

What I came up with was buy a simple and cheap (£2.99) MP3 player off ebay, pair it with a small battery powered speaker (£5.99) and away we go.....doh!   Both items are amazing and just right for the job BUT both are battery powered (will go flat after he falls asleep and they are left on) and two, they both have on-off switches underneath which stops me mounting them on a surface.

Sorry this is going on so long....... What I thought of doing is getting a loooooooong lasting battery source (would 9v last a lot longer) and bringing ing it down to 1.5v (x2 one feed for each device). Then it wouldn't matter if they were left on overnight a few times -  or am I deluded.  Or better still, can anybody please advise?

Both the speaker and MP3 player have internal rechargeable batteries but they rely on a VERY busy mum recharging them daily so I am looking for an alternative.

thanks


Discussions

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DavidN71

4 years ago

Rechargeable batteries are much cheaper in the long run than throwaways. NiMh don't mind being run flat and don't have the memory effect or toxic components that NiCads do. Don't believe any eBay seller who claims more than 2700 mah for a AA NiMH cell. eBay refuses to ban the scammers who sell 3000 fakes. The physical limit for a AA cell is about 2800 mah. Name brand cell under 2000 mah are the best buy. More capacity means fragile.

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TN1946

4 years ago

Possible Solution: Electronic Advice Needed Please


What
I cam up with was a solar battery charger. My thinking being that at
five year old my grandson IS going to fall asleep whilst listening to
his battery driven mp3 player and battery driven speaker. But if they
are powered by a solar panel it wouldn't matter if they went flat as
long as he, or his Mum, put the panel (still connected to mp3 player and
speaker) on his window sill to recharge all day ready for bedtime.

Problem:
I have just done an experiment and when the components go flat and
start running off the solar panel charger there is a 'motor boating'
sound on the audio. No doubt this can be smoothed out by the addition of
a condenser or resistor, any body able to advise, please. Thanks.

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TN1946TN1946

Reply 4 years ago

sorry, me previous message was not meant to start with 'what'. It should read 'what I came up with'.

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robo10302

4 years ago

Hey this seems simple enough so heres the best solution... First lets take the battery out of the equation, done that good now we need an alternative that you wouldnt have to keep replacing over and over again. Use a wall adapter buy a 5v adapter and power both devices at once, they both run on 3.7v battery with current draw of around 200mah so a 5v 1amp wall charger would suffice. Now we can add a switch at the top so you can turn it off without having to pick it up. If you like the idea I can guide you step by step into making this. Have fun Thank you

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Downunder35mrobo10302

Reply 4 years ago

They run on 3V if I understand correctly, powering them with 5V instead is not a good idea unless they provide a plug to take 5V directly.

You don't use a 9V motor on 12V just because you have a 12V power supply at hand ;)

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TN1946robo10302

Reply 4 years ago

hi, thanks for replying, problem is 5yo and wires don't go together. He would either pull the cable out of the mains plug or God forbid get it around his neck.