FM radio kit
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Posted by
Tom Walton
on
Apr 5th, 2011
Can I have the full dimentions for this kit, Speakers and PCB.
Posted by
geoffhampson
on
Apr 5th, 2011
The speaker is 66mm dia, 20mm wide and the PCB is 88 x 46mm
Posted by
geoffhampson
on
Apr 5th, 2011
I have another speaker to attatch to a radio kit. Is it possible to attatch another speaker too this product?
Posted by
geoffhampson
on
Apr 5th, 2011
The FM radio uses the TBA820M IC to drive the speaker. According to the datasheet at 9V it will drive 1.6W in to an 8 ohm load (one speaker) or 1.2W in to a 4 ohm load (two parallel speakers). So yes you can add a 2nd speaker provided it goes in parallel with the first speaker. This would be of benefit if you are doing a radio for product design and want it to have two speakers for its looks. Please note that adding a 2nd speaker wont give you stereo sound or twice the volume.
Posted by
Josh Murton
on
Oct 10th, 2011
What is the frequency range available with the kit?
Posted by
geoffhampson
on
Oct 10th, 2011
The radio will receive the whole FM commercial radio station range from 87MHz to 108MHz. In fact due to component tolerances it is designed to include a bit more at both ends of the range to be sure that no stations are missed off.
Posted by
Adam
on
May 10th, 2012
How loud is the speaker? And roughly how long does the battery last if the radio was left on all the time?
Posted by
geoffhampson
on
May 10th, 2012
The amplification section of the kit is based on the TBA820M IC and that can output 1.2W. Which is plenty loud enough to be heard by a few people in a room. The question of how long the battery lasts will depend on what battery / batteries you use and how loud the volume is. As A guide a 9V PP3 battery on full volume will last about 4 or 5 hours. Swap it for 6 C cells and it will run continuously for a week. 
