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| 17:58.12 | ericxdu | Why do you need 2A to power the card via USB-OTG, put |
| 17:58.33 | ericxdu | But 7-21V to power the Microdesktop? |
| 18:08.47 | ericxdu | Is that just a mis-match of ratings? |
| 18:19.23 | arossdotme | V=volts A=Amps |
| 18:19.34 | arossdotme | 2A @ 5V |
| 18:19.59 | arossdotme | so for one number we times V*A=Watts |
| 18:20.44 | arossdotme | which you can then use to work out how many amps at 7-21V the micro desktop will take to power the cpu card |
| 18:20.47 | arossdotme | so... |
| 18:20.50 | arossdotme | ericxdu, ^ |
| 18:21.57 | arossdotme | lets say hmm heck, lets say your putting 19v into the micro desktop just cus ya got a laptop power supply that does that |
| 18:22.12 | arossdotme | so back to the cpu card, working out the watts |
| 18:22.47 | arossdotme | btw the 5V in "2A @ 5V" is cus that is the voltage of usb |
| 18:23.05 | arossdotme | 5V*2A=10W |
| 18:23.39 | arossdotme | 10W÷19V= |
| 18:23.49 | arossdotme | 0.526A |
| 18:24.20 | arossdotme | so cpu card powered via otg-usb or mirco desktop its the same amount of total power |
| 18:24.42 | arossdotme | 0.526A*19V= |
| 18:25.16 | arossdotme | 10W |
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| 18:36.08 | ericxdu | Ah, maths. I think I get it now |
| 18:36.55 | ericxdu | I think the supply I'm looking at is 12v 1.5a so... let me math real quick |
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| 18:39.29 | ericxdu | Comes out to needing .83 amps |
| 18:39.52 | ericxdu | I'll check again when I have the cable with me... may have misremembered the voltage |
| 19:13.57 | arossdotme | not that you cant connect a power suppy more than 5v to the usb-otg power input on the card other wise you will damage/blowup your cpu card |
| 19:14.01 | arossdotme | not=note |
| 19:14.56 | arossdotme | re Amps, as long as if supplys 2A or more your ok. heck it could be 50A and thats np as long as its 5V |
| 19:15.29 | arossdotme | but its its 1A at 5V that wont be enough to reliably power the cpu card |
| 19:16.56 | ericxdu | arossdotme: I have the right charger for powering via usb... its a 5v 2a I found I was using for my phone |
| 19:17.21 | ericxdu | So I'm trying to find one for the microdesktop housing in case I get one |
| 19:17.32 | arossdotme | so with the microdesk top as long the Voltage of the power supply is with in the range can supply enough current which can be worked out by doing 10W/$PowerSupplyVoltage and if it is the same or more than the current/Amps rating of the power supply then your good to go |
| 19:17.37 | ericxdu | I like options |
| 19:17.42 | arossdotme | ericxdu, cool |
| 19:18.03 | arossdotme | btw by range i mean =7-21V |
| 19:18.49 | ericxdu | arossdotme: okay I'll use that rule of thumb when I check my supplies |
| 19:49.53 | arossdotme | good luck and have fun |
| 19:53.30 | arossdotme | tree and pwgen too |
| 19:53.43 | arossdotme | opps wrong channel |
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