Help me build a USB powered am/fm radio

[kevin83]

USB powered am/fm radio

Hi All,

First of all, i would like to say hi to all the engineering enthusiatic here, it's such a nice forum with so many active posting and a great helpful community I can see.

I hav a small project in my mind and i hope u guys can give me some pointers. Here's a descriptions of the small project i wanna do.

"USB POWERED AM/FM radio"
-Small am/fm radio receiver with speaker
-Able to power by USB w/o detected as an storage device.(it's nt meant to b a storage device), i juz need the power from the usb to power the am/fm radio n play it while i plug into the usb.

I am not sure whether it's workable n i dunno anythin bout usb /pc programming, i realy hope all the expert here can give me ur guidance. Thank you...

 

[IanP]

Re: USB powered am/fm radio

Besides a data link, USB provides 5 +/- 0.25 volts to power an otherwise unpowered device or charge a battery in a self powered device. A USB controller or hub is required to power one unit load (100 mA, a low power load). It can optionally power up to 5 unit loads (500 mA, a high power load). The spec is silent about intermediate loads, so I assume that the sources deal with just the two cases. Either a load is low power (like a keyboard or a mouse) or high power (like an iPod or PDA).

If you need just power it is readily available and I wouldn't worry about data pins at all ..
I am pretty sure your PC doesn't care much if you "steal" some mAs of power through it's USB port ..

Regards,
IanP

 

[haerifar]

USB powered am/fm radio

here it is usb pinout
left to right
1 VCC Red +5 VDC
2 D- White Data -
3 D+ Green Data +
4 GND Black Ground

and you can use power without use data and computer can not detect any hardware connected
have nice job.