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JonSAlberta
6
Dec 3, 2015
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Why is the power adapter 12V AC 220ma output? 14V is the recommended output. https://www.jdslabs.com/pdf/O2_Power_Adapters.pdf
Dec 3, 2015
MattMcP
8
Dec 4, 2015
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JonSAlbertaThis page on the wiki disagrees. Other sources online say it is 14-20v
http://o2amp.wikia.com/wiki/Power_Adapters
Dec 4, 2015
JonSAlberta
6
Dec 5, 2015
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MattMcPThank you for the Wiki link http://o2amp.wikia.com/wiki/Power_Adapters It says the min power adapter is 13.5V 200ma . Massdrop is shipping with 12V 220ma. It powers up the O2 AMP (I have read post from people who received them and they play music.) However it is below the minimum rated adapter. This seems wrong. There would be a reason for the minimum adapter being rated at 13.5V. I don't understand electronics enough to know what the long term effects of deliberately under powering a circuit. Will it do damage to any component, or just reduce the output of the AMP?
Dec 5, 2015
PaulMD
70
Dec 5, 2015
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JonSAlbertaIt could actually damage the components. For a constant-current circuit (the O2 is designed as such for the safety of the output devices) under-current means over-amp. E=IR and R (the headphone load) is constant. NwAvGuy overdesigned the O2 enough that it'll cut out before anything permanent - probably. But in the long term there's no reason to push it - it's not the right unit.
12V is probably the driving voltage of the circuit. It probably won't be a problem *if the adapter reliably feeds 12V* but if it starts dropping past that I would be concerned. There's a reason it's overspecified - there's almost certainly a buck-converter circuit that depends on being fed a higher voltage (i.e. 13.5-17V) so it can buck down to 12V, and there's a certain internal voltage loss inherent to such converters. If you feed it 12V it may be feeding 11.5V internally and so on.
I call on the Massdrop folks here as well - at best you are shipping a device with an out-of-spec adapter, and that's scummy.
At worst you may be violating the Creative Convention/No Derivation design license by substituting another supply unit. You have no flexibility here if the design specifies input voltage, and NwAvGuy was the kind of guy who doesn't miss much in his specs.
Dec 5, 2015
xFulcrum
0
Dec 5, 2015
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PaulMDAs I mentioned previously, I'm having issues with mine being recognized by Windows. I have the option of refund or replace, and I'm wondering if I should try to purchase a 14vac transformer first or just get a refund and buy from elsewhere where they pay attention to specs. Suggestions?
Dec 5, 2015
JonSAlberta
6
Dec 6, 2015
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PaulMDHere are proven power adapters for the O2 and O2/ODAC: https://www.jdslabs.com/products/147/us-15vac-power-adapter-for-o2/ 120V 60Hz https://www.jdslabs.com/products/73/g-e-z-15vac-adapter-for-o2/ 220-240VAC 50Hz This one has a higher power rating but it is within limits for the O2 (it is intended for "The Element" amp/DAC) https://www.jdslabs.com/products/161/16vac-power-adapter-for-the-element/
Cost and shipping is over $25 to Canada.
Dec 6, 2015
RetroG
4
Dec 6, 2015
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PaulMDFollowing on from JonAAlberta and PaulMD - I've just received the O2 which was supplied with a 240 volt power adapter for use in the UK (but fitted with a US plug). The output is 12 volt and 220 mA. Should a 13.5 volt adapter have been supplied ? Looking at the Wiki link for the O2amp it would appear that a 13.5 volt adapter is required. I would be grateful if Massdrop would clarify this before I start using the equipment (once I buy a US to UK plug adapter!).
Dec 6, 2015
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