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projects:spectrumanaliser:step1_hardware [2012/05/06 10:48] elger |
projects:spectrumanaliser:step1_hardware [2012/05/06 10:54] elger |
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| ====== Spectrumanaliser Hardware ====== | ====== Spectrumanaliser Hardware ====== | ||
| - | There are four hardware components in my spectrumanaliser project; | + | There are four hardware components in my [[projects:spectrumanaliser|spectrumanaliser project]]; |
| * Power-supply | * Power-supply | ||
| * Opamp | * Opamp | ||
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| Usually I would not mention this separately but there is one important thing to know about powering this project. | Usually I would not mention this separately but there is one important thing to know about powering this project. | ||
| {{ :projects:spectrumanaliser:spectrumanaliser_powersupply.jpg?200|}} | {{ :projects:spectrumanaliser:spectrumanaliser_powersupply.jpg?200|}} | ||
| - | The Opamp (audio amplifier) is very sensitive. If there is a lot of noise on the power supply then the opamp will pick up this interference. So the best thing to do, to prevent interference from the display on the audio signal is to have one power source for the Arduino + opamp, and another one for only the display. | + | The Opamp (audio amplifier) is very sensitive. If there is a lot of noise on the power supply then the opamp will pick up this interference. So the best thing to do, to prevent interference from the display on the audio signal, is to have one power source for the Arduino + opamp, and another one for only the display. |
| - | The Ground (0 Volt line) of both supplies must be connected (of course) so the 5V level of both supplies are the same 5V above ground. If you do not connect the ground together, you will get two "floating" 5V lines. Both are 5V but what level is the one 5V compared to the other 5V? This is whay you must join the ground lines to each other. | + | The Ground (0 Volt line) of both supplies must be connected (of course) so the 5V level of both supplies are the same 5V above ground. If you do not connect the ground together, you will get two "floating" 5V lines. Both are 5V but what level is the one 5V relative to the other 5V? This is why you must join the ground lines to each other. |
| I simply made two 7805 circuits and joined the ground together. | I simply made two 7805 circuits and joined the ground together. | ||