Pazzy

I have previously shown how to calculate the values for the sine table. Now I will show you how to use that sine table for generating a sine wave using a PIC16F684. Why PIC16F684? It is a nice little 14-pin PIC that contains all that is needed for SPWM (sinusoidal pulse width modulation) – the ECCP module. Since the ADC or comparator or other peripherals are not used and there are enough pins, I selected the PIC16F684. You can find the tutorial here: http://www.blogspot.com/2016/01/generation-and-implementation-of-sine.html Let’s run the 16F684 from a 16MHz crystal oscillator and use a 16kHz switching frequency. So, the required value of PR2 is 249. The sine table (for half a cycle) is: 0, 25, 49, 73, 96, 118, 139, 159, 177, 193, 208, 220, 231, 239, 245, 249, 250, 249, 245, 239, 231, 220, 208, 193, 177, 159, 139, 118, 96, 73, 49, 25 '''''''''''''''''''''''''''''''...

 Sony Computer Entertainment Inc . (SCEI) announced that cumulative sell through for the PlayStation 4 ( PS4 ) worldwide has surpassed 2.1 million units as of December 1, 2013. The number includes the 700,000 units sold through in Europe and Australasia launching on November 29. The PS4 system became available on November 15 in the United States and Canada and on November 29 in Europe, Australasia and Latin America and is now available in 32 countries globally. “ PS4 delivered the best launch in PlayStation history with the North American release and we’ve continued this incredibly successful start in Europe, Australasia and Latin America,” said Andrew House, President and Group CEO, Sony Computer Entertainment Inc. “Demand remains incredibly strong and continues to overwhelm the supply worldwide, but we are diligently working to meet those growing demands and to deliver additional PS4 units to our retail partners throughout the holiday season.  We are extremely grateful f...

The dB (decibel) is one of the most common units in engineering, yet also one of the most confusing, especially when it comes to manipulating S-parameters. Here is how not to be confused. The Bel is a fundamentally new unit, which was originally established in 1928 by The Bell System to describe sound levels. This scale has since been generalized to relate to the log of the ratio of any two power levels. The most important principle of the Bel scale to keep in mind is that it is, without exception, by definition, the ratio of powers. It originally related to sound level powers, but has since been generalized to all types of powers. [ ]

For those who love tunes and the ability to take them along wherever you may roam, there are some great auto sound systems that allow you to basically plug in your favorite tunes to play as you go. It doesn't really matter which style of MP3 player you use, most of the newer auto sound systems at least have the ability to read and translate the material from these players into great music for you to enjoy on your ride by simply plugging your MP3 player into the car stereo. Many of us find that lugging around an MP3 player with all of our favorite tunes (or at least most of them-with up to 40 gigs of hard drive space it might take a while to fill completely) is much easier and more practical than attempting to lug around a huge case of CDs. It is also great for those of us who find ourselves disappointed when we purchase CDs only to find that we really only like one or two songs. Now we can simply download the songs we know and love while avoiding those we are uncertain about or at ...