Hey!
I've done both and switching is way way better than linear, but it was kinda hard to get it working right.
And about the cables I don't think it matters much if you are using a standard USB cable, just test the device before plugging it to charge something.
Ans-2 -->No need to consider cable resistance and all unless the length of the cable is longer than half a meter, use short circuit protection circuitry at the output of the circuit for safety.
Hi, what kind of testing did you do before connecting the usb cable to the phone?
Hi, i have read about supplying some voltage to both the data ports in the usb is needed to drive the device to start charging. Is that true and is applicable for most devices like mp3 players to smartphones?
Hi, i am planning to make some usb chargers to charge electronic devices like smartphones.
I have the following questions to ask:
(1) Is it better to use switching regulator or linear regulator ICs? The ICs will convert 12Vdc to 5Vdc. I know that switching regulator ICs have better operating efficiency but linear regulator(7805) is low cost.
(2) After selecting the right IC and assembling the circuit, we can just directly plug in the usb charging cable or we have to consider other factors such as the cable's resistance ?
Thanks.
You can use dedicated connectors for each phone/device and resistor adjusted for that device is solder inside each connector. If device not need data +/- then you will not add this resistors in connector.
Use SMD 1206 or 0805 resistors. Connectors should have ability to be open.
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