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Super Voyager |
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ServerBaboon
Senior Member Joined: 16 Jan 2008 Location: NW England Status: Offline Points: 970 |
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Fair point Task, my phone has non removable battery, but maybe it needs more safety testing which is expensive.
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Steve
------------- Various bits of GSP Kit ..well two so far, unless you count the cables that is. |
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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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 |
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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franklin
New Member Joined: 14 May 2010 Location: Hong Kong Status: Offline Points: 39 |
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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
Senior Member Joined: 18 Mar 2013 Location: Dorset Status: Offline Points: 4334 |
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A portable unit containing two rechargable 9V batteries? I would never want to sacrifice sound quality for smaller size.
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We do not see things as they are. We see things as we are.
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ServerBaboon
Senior Member Joined: 16 Jan 2008 Location: NW England Status: Offline Points: 970 |
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Should give you good long term Battery life Edited by ServerBaboon - 20 Nov 2013 at 4:45pm |
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Steve
------------- Various bits of GSP Kit ..well two so far, unless you count the cables that is. |
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Ash
Senior Member Joined: 18 Mar 2013 Location: Dorset Status: Offline Points: 4334 |
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We could ask for a wind-up (crank) Voyager...
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We do not see things as they are. We see things as we are.
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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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...
I can assure you it will be 'industrial' but maybe not that industrial. |
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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