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Author Topic: Speaker advice using wave shield.  (Read 1316 times)
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Hi I was wondering is anyone here has any advice on how I would play audio through some speakers using the wave shield. The audio needs to be slightly louder then speaking volume. I have tried using an audio amp (6 to 16v) and this will work ok but as you can see it requires a lot of volts. I was wondering of a way to power some speakers off the 5 volts provided by the arduino?
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Use a transistor to control the speaker vs arduino pin directly.
5V peak to peak across a 4ohm speaker would yield P=V^2/R = 6+watts, yes?
I use a simple MOSFET amplifier to make some decent volume out of a 2", 4 ohm speaker that I got for $1.49 fro mpja.com, but I also run it from 12V.

I also have a sample of an H-bridge chip based board that I've been looking to try out, will send some details when I get home if the developer doesn't answer first.
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

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Hi thanks for the reply!

so are you suggesting using the transistor as an amp eg. positive speaker output to base of transistor, collector to the 5 volts then emitter to ground?

Thanks again!

J
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I wired mine up like this.

since I was looking for GND to +Supply swing if 0-5v signal coming in, I didn't bother with proper input biasing like this:
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

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