I'm considering buying the Adafruit wave shield
for my Arduino alarm clock, but, as a newbie in audio electronics, I have some questions/concerns I'd like to resolve before acquiring one.Will the shield deliver enough power to my speakers?
The shield is said to deliver enough power for headphone-type speaker. The fact is, I think my speakers are somewhate bigger than this, and should play the audio at a rather strong volume (it's an alarm clock !). My question then is : what happens if I connect my (perhaprs too "big") speakers directly on this shield ? Will they just produce a low-volume sound or/and the shield itself will be in a dangerous condition ?
Now, you will probably ask : "what is the impedance of your speakers?" I don't know! I guess this won't be of much help, but their dimensions are 5cm*11cm (they have been salvaged from an old television). Actually, they are now fully enclosed in the clock's case and will be very difficul to remove, which brings me to my second question.How to cheaply measure speaker impedance?
Will a simple mesure of resistance and inductance do the trick ? I dont need a precise value, just an order of magnitude in order to make it work (actually, I don't have much equipment at home -but I can borrow some if necessary-).What can I do if my volume is too low?
If the power delivered by the shield is actually too low, will a simple amplifier like this one
solve my problem ? (i guess it depends again of my speaker's impedence)
Thanks for your time.