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Super Voyager

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ServerBaboon View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ServerBaboon Quote  Post ReplyReply Direct Link To This Post Posted: 18 Nov 2013 at 11:02pm
Fair point Task, my phone has non removable battery, but maybe it needs more safety testing which is expensive.

Steve

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Various bits of GSP Kit ..well two so far, unless you count the cables that is.
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Graham Slee View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 19 Nov 2013 at 6:59am
Phone manufacturers may think they're above the law - possibly because they are multi-billion dollar companies like the Banks... and not even Genghis Khan could stand in their way!

However, when it comes to other battery powered products like cameras - in my experience they often comply.

In answer 2.7 here: http://ec.europa.eu/environment/waste/batteries/pdf/questions_answers_directive.pdf you can judge for yourself. But not being able to fight a multi-million dollar law suit with the European Union I simply have to comply!

Back to headphone amplification and the difficulty is in driving your high impedance headphones...

Or I should say, pleasing both high impedance and low impedance headphone users at the same time.

These are the options:

Big battery - big box - high performance --- or --- little battery - small box - poor performance (and low volume on high impedance headphones).

So just like most phones you get poor audio performance, and that's the reason you look toward a separate headphone amp.

How to make a portable headphone amp small?

Answer: fill it full of charge pump ICs or switching mode converters to make use of a low voltage battery.

Result: poor sound.

How to make a portable headphone amp sound good?

Answer: it needs a good power supply.

Voyager MK1 uses a 9V battery.

I will be grateful for your further thoughts in designing this product for you.


Edited by Graham Slee - 20 Nov 2013 at 8:54am
Not simple enough for Google-Bot to understand...
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franklin View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote franklin Quote  Post ReplyReply Direct Link To This Post Posted: 20 Nov 2013 at 11:45am
How about a sd card player ? There are many sd card / usb finger device with speakers and dead cheap. There must be some new IC around ??
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Ash View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 20 Nov 2013 at 1:02pm
A portable unit containing two rechargable 9V batteries? I would never want to sacrifice sound quality for smaller size. Smile
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ServerBaboon Quote  Post ReplyReply Direct Link To This Post Posted: 20 Nov 2013 at 2:31pm
Originally posted by Nuance_Ember Nuance_Ember wrote:

I would never want to sacrifice sound quality for smaller size. Smile


 Should give you good long term Battery life Wink







Edited by ServerBaboon - 20 Nov 2013 at 4:45pm
Steve

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Various bits of GSP Kit ..well two so far, unless you count the cables that is.
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Ash View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 20 Nov 2013 at 3:02pm
We could ask for a wind-up (crank) Voyager... LOL
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 20 Nov 2013 at 3:02pm
Originally posted by franklin franklin wrote:

How about a sd card player ? There are many sd card / usb finger device with speakers and dead cheap. There must be some new IC around ??


I'm afraid not. Most of these devices carry a 144 pin dedicated chip or otherwise some form of PIC, and are only made cheaply in one place on earth...

Originally posted by Nuance_Ember Nuance_Ember wrote:

A portable unit containing two rechargable 9V batteries? I would never want to sacrifice sound quality for smaller size. Smile


I can assure you it will be 'industrial' but maybe not that industrial.
Not simple enough for Google-Bot to understand...
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