Have you ever thought of making your own portable speaker in a CD case? Here is how you do it.
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Signing UpStep 1: Components required
- 8W speaker with 4 ohms impedance (Make sure the speaker's impedance must match your amp's specification or you would damage your amp!!)
- CD case ( Use the one with a zip would be good)
- 18W Amplifier module (I used the Kemo #M033, you can use other amplifiers as long as the Watts are not 2.5 times larger than your speaker's power level)
- Rocker switch
- 3.5mm stereo adapter
- Battery snap and a 9V battery
- Solder iron and some solder
- Glue gun
- Cutting knife
- Drill
Note that:
If you choose an amp that is supplying too much power to your speakers, then its clear that there is a chance that you will damage them. It may cause the voice coil to overheat, or the speaker could move back and forth too much (known as exceeding its Xmax).
However if you have a smaller amplifier you may have to run it all the way up full to provide enough power to your speakers. When running at full blast, there will be lots of stress on the components of the amps and it can introduce a significant amount of distortion into your signal, which is often called 'clipping'.
As well as sounding very bad, trying to reproduce a clipping signal can potentially do far more damage to your speakers that a little too much power.
Therefore the unwritten rule is that you should have an amplifier that is capable of 1.5 to 2 times the power rating of your speaker system, and only turn it up part way. The extra power available is called the headroom, and means that your amplifier should never been running at full tilt and therefore producing a distorted, or clipped, signal.
- CD case ( Use the one with a zip would be good)
- 18W Amplifier module (I used the Kemo #M033, you can use other amplifiers as long as the Watts are not 2.5 times larger than your speaker's power level)
- Rocker switch
- 3.5mm stereo adapter
- Battery snap and a 9V battery
- Solder iron and some solder
- Glue gun
- Cutting knife
- Drill
Note that:
If you choose an amp that is supplying too much power to your speakers, then its clear that there is a chance that you will damage them. It may cause the voice coil to overheat, or the speaker could move back and forth too much (known as exceeding its Xmax).
However if you have a smaller amplifier you may have to run it all the way up full to provide enough power to your speakers. When running at full blast, there will be lots of stress on the components of the amps and it can introduce a significant amount of distortion into your signal, which is often called 'clipping'.
As well as sounding very bad, trying to reproduce a clipping signal can potentially do far more damage to your speakers that a little too much power.
Therefore the unwritten rule is that you should have an amplifier that is capable of 1.5 to 2 times the power rating of your speaker system, and only turn it up part way. The extra power available is called the headroom, and means that your amplifier should never been running at full tilt and therefore producing a distorted, or clipped, signal.
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I wonder if i can make it work with a 80 Watt speaker?
The Tegra 2 (used in many smartphones but is being supplanted by the Tegra 3) has 260 million transistors.
Most modern desktop CPU's have between 250 million and 1.2 billion transistors, while server CPU's can have up to 2.5 billion transistors.
Modern desktop GPU's can have up to 4 billion transistors.
Most people will never encounter an FPGA (a sort of reconfigurable CPU), but they can have just shy of 7 billion transistors.
A gigabyte of DRAM (the kind of ram in smartphones and PC's) has about 8 billion transistors.
A gigabyte of Flash memory has either 8 billion (SLC) or 4 billion (MLC) transistors.
It would take a horribly powerful magnet to mess with any of it, since they all off specific electrical signals at certain voltages which are incredibly difficult to generate by accident with a magnet. As you pointed out the magnets were a concern for certain magnetic storage technologies. Even then, while a floppy disk could be damaged by an errant magnet in the pocket, even modern magnetic hard drives require much more powerful magnets to destroy the data without physically touching the platters inside (hard drives actually have quite powerful magnets sitting right next to the platters which don't affect the data at all).
Simply put, it's not likely you'll be able to get your hands on a magnet powerful enough to hurt your smartphone, and you most certainly won't be able to get that magnet to fit in your pocket.
About the hard drives, i've seen the magnets inside and they're really powerful but as you said they can't erase the data, to erase the data (and probably completely destroy it) it would take a magnet about as powerful as an MRI or something bigger.
There's always a way :) and most of the time it's fun as hell!
any preferable online websites ?