Sony PCM M10 as portable player? - Page 11

Sorry for the bump. Do you know if I can use LiFePO4 3.2v battery with my Sony m10? Is there anyone who tried it? 

Quote:

Originally Posted by ozkan 

Sorry for the bump. Do you know if I can use LiFePO4 3.2v battery with my Sony m10? Is there anyone who tried it? 

Don't try it.  

All LiFePO4 battery packs are rated at a so-called "nominal" voltage.  When fully charged, a LiFePO4 will deliver 4.2V per cell, so even it is a 1-cell battery, the voltage will be too high for the Sony PCM-M10.  

Given the incredibly long play time offered when using rechargeable AA batteries, internally, I've never felt a need to create an external battery pack for the PCM-M10.

Good for you to ask first - you may have damaged something, otherwise.

Mike

Thank you very much Mike.

I can guarantee that its fine to use a single lifepo4 with a dummy cell since i have being using it for over 1 year.Power supply definitely affecting PO of M10 but no on LO.

 Cell voltage for lifepo4 batteries :

• Min. discharge voltage = 2.8 V
• Working voltage = 3.0 ~ 3.3 V
• Max. charge voltage = 3.6 V

lifepo4 batteries provide constant voltage all the time while aa battery drop in voltage as u use.M10 don't regular voltage that well .You can heart when ur aa battery is going flat.

Hi otakuflick!

Quote:

Originally Posted by otakuflick 

I can guarantee that its fine to use a single lifepo4 with a dummy cell since i have being using it for over 1 year.Power supply definitely affecting PO of M10 but no on LO.

 

 Cell voltage for lifepo4 batteries :

• Min. discharge voltage = 2.8 V
• Working voltage = 3.0 ~ 3.3 V
• Max. charge voltage = 3.6 V

 

lifepo4 batteries provide constant voltage all the time while aa battery drop in voltage as u use.M10 don't regular voltage that well .You can heart when ur aa battery is going flat.

I must apologize to ozkan for posting incorrect information about the voltage range of LiFePO₄ batteries.  Your post, quoted here, prompted me to research them and I found that you are correct regarding the voltages, per this Wikipedia article.

The voltages I had given are only appropriate for LiPo batteries, as described in this article.

Your having suffered no negative consequences from supplying the PCM-M10 with up to 3.6V (20% greater than the spec voltage of 3.0V), suggests that it is indeed safe to do so.  And I can imagine that you would indeed hear an improvement in sound quality with at the headphone out (as the amp section's op-amps are probably operating at a proportionately higher swing voltage).

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I do, however have a slight problem with your suggestion that LiFePO₄ batteries provide a "constant voltage" until they are discharged.  It's very flat relative to alkaline batteries, but this chart shows that the voltage is not truly constant.  After all, the useful range of voltages covers a drop from 3.6V to 2.8V.

Source:  http://blog.evtv.me/

The good news, if the battery you are using is anything like the ones tested in the chart, is that the voltage drops rapidly in the first 2.5% of the discharge cycle, then plateaus very closely to 3.0V for the rest of the discharge cycle - making me all the more comfortable with the idea of using a LiFePO₄ with the PCM-M10.

Thanks again for correcting my error,

Mike

Thanks for the clarification Mike and otakuflick. One more question, does m10 need burn in to sound best? If so, how many hours does the built in amp needs to burn in? I assume 200 hours or so? Am I right?

I don't know - I've probably spent all of five minutes, total, listening to the headphone out. 

Originally Posted by otakuflick 

I can guarantee that its fine to use a single lifepo4 with a dummy cell since i have being using it for over 1 year.Power supply definitely affecting PO of M10 but no on LO.

 

 

 

How does it effect the headphone out of M10?