Hi, I have a little problem and maybe one of you can help me. 
I bought an MP3-TF-16P to realize a small project. With the supplied 2W 8Ohm loudspeaker, it works perfectly. But now I would like to use a 0.5 watt 8 ohm speaker. Unfortunately, when I connect it, there is no sound.
Unfortunately, I don't know much about sound engineering and can't really find any information on the Internet as to why this might be.
I would appreciate any advice! I'm a bit lost at the moment! 
LG Mats
Most likely, either your wiring is wrong or defective, or the speaker is defective. Post a closeup, focused photo of the setup and perhaps forum members can help.
In the meantime, check for bad or shorted solder joints and proper continuity, using a multimeter.
Does the speaker measure 8-Ohms? It's OK if it measures a little less, maybe 4-Ohms because the DC resistance is usually lower than the rated (AC) impedance. And most meters aren't super accurate when you get "close" to 1-Ohm. If it measures open, it's dead (or it's a piezo transducer and not really an 8-Ohm speaker). (Disconnect it from the circuit to measure.)
The wattage rating on the speaker is the maximum you can feed-it from an amplifier.
Theoretically, you could burn-out the speaker, since the audio board can put-out 3W into 4-Ohms and 1.5W into 8-Ohms, but that probably didn't happen.
Otherwise it's not important and you can connect a 100W speaker, and you'll just get the maximum the little amplifier can put-out (or less with the volume turned-down).
Try connecting a 1.5V battery across the speaker and it should "click". (Don't connect 5VDC because 5VDC into 8-Ohms is about 3W.) ...It might click quietly when you measure Ohms with a meter.
Cross posted to: 0,5 Watt Lautsprecher mit MP3-TF-16P verwenden
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