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To build a simple audio amplifier with a gain of about 20 you can use the LM386 on its own with pretty much nothing else required However, with a few extra parts it can be configured to deliver a gain of about 50 If necessary it can be configured for a gain of up to 200, but that's pushing the limits of what it can do and since we're powering the amplifier circuit from the Arduino's 5V supply the current drain and noise on the supply rails could become a problem Audio amplifiers pull a lot more power than the typical digital circuits you might be used to dealing with on an Arduino: since amps equals watts divided by volts, even a tiny 1/4W amplifier running on a 5V supply can suck down 50mA of current, assuming it runs at an unrealistic 100% efficiency.

Often, people don t design with subclassing in mind, but allow it regardless. Unintended and dangerous consequences follow from this, as the number of ways in which the API can be used increases significantly. Take a simple method in a subclassable class such as this: public class Hello { public void hello() { System.out.println ("Hello"); } } This method can cause problems, because external code can call it: public static void sayHello() { Hello hello = new Hello(); hello.hello(); } Meanwhile, you can also override it to do something else: private static class MyHello extends Hello { @Override public void hello() { System.out.println ("Hi"); } } It can also be overridden with a call to super: private static class SuperHello extends Hello { @Override public void hello() {

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Even worse than the current drain, though, are the fluctuations that can be induced on the supply rails, since the current consumption isn't consistent but rather jumps around all over the place depending on the input signal A gain of 50 gives a reasonable balance between a high output volume and low power consumption, and won't strain the Arduino's power supply If you want more volume you'll probably need to use a more substantial external amplifier and feed it with the line-level output connection, and also make sure the supply rails are adequately filtered The LM386 needs to be fed with a filtered version of the output from the SpeakJet, so it uses the same low-pass filter as the line-level output and then adds the LM386 to provide an amplified version of the signal.

super.hello(); System.out.println("Hello once again"); } } More than likely, a far wider range of choices is presented here than was originally intended. However, the solution is simple: simply make the Hello class final! When writing an API without wanting to let users subclass its classes, it s better to disallow this behavior. If you don t explicitly disallow it, you can be sure that some of your API users will subclass your API. As the Hello example shows, you ll then need to support at least three different ways of using the methods that your classes expose. For the sake of future evolution, it s better to disallow subclassing. In relation to this, also see 8. Again, the simplest solution is to make your class final. Other approaches include nonpublic constructors, which you should use anyway (as explained in the section A Factory Is Better Than a Constructor ), or making all or at least most of your methods final or private. Of course, this only works for classes. If you decide to use interfaces, you cannot forbid foreign implementations on the level of the virtual machine. You can only ask people in the Javadoc not to do it. The Javadoc isn t a bad channel for communication, but if subclassing isn t prohibited people will always ignore the Javadoc advice and implement the interface anyway. Consequently, unless there are performance implications, it s preferable to prevent the subclassability on the virtual machine level by using final classes.

Add the LM386 to the shield along with its associated parts, the 10K trimpot and the various resistors and capacitors, as shown in Figure 9-9 Finally, solder on the PCB-mount two-pin screw terminal to provide a handy connection for a speaker..

def get_absolute_url(self): return "/weblog/%s/%s/" % (self.pub_date.strftime("%Y/%b/%d").lower(), self.slug) Once again, you re using Python s standard string formatting. In this case, you re interpolating two values: the entry s pub_date (with a little extra formatting provided by the strftime() method available on Python datetime objects) and the entry s slug. This particular formatting string will result in a URL like /weblog/2007/oct/09/my-entry/. The %b character in strftime() produces a three-letter abbreviation of the month (which you force into lowercase with the lower() method in order to ensure consistently lowercase URLs). In general, I prefer that to numeric representations because it s a bit more readable. If you d prefer the month to be represented numerically, use %m instead of %b.

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