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MP
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Posts posted by MP
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I will go with your suggestion, mixos...and I will ignore the crap from ante.
MP -
On the contrary, if you count the posts, you will see that I have only entered into a few of audiogurus last 20 or more posts. I only post where I have something to say. I have no intention of staying silent because audioguru is in the forum. Even where I have told him I was finished, he continues with ridicule and insult to try to keep it going...and at some point mixos says to stop.... I am getting tired of this crap.
It seems you are now telling me that I should not post my own opinions or views in the forums. For someone who is so quick to accuse me of censoring, I am surprised to see this from you. I certainly take offense of your accusation that I am stalking someone and that I should not post in a forum that has audioguru in it. I also take offense to you and audioguru resorting to ridiculing me in the forums such as I see in your most recent posts. You should listen to your own words.
MP -
This topic has been moved to Microcontroller Projects, Programming.
It is not about a project in our "Projects" Section.
[iurl]http://www.electronics-lab.com/forum/index.php?topic=8880.0[/iurl] -
No, I have not contradicted myself. Again, I see no point in this thread except your need for argument.
MP -
Sounds like you just want to argue..... and you don't even use micros.
EDIT: ..."do not use" meaning you do not design projects with, or program micros.
There is no point in posting any further here.
MP -
Sure, 10.7 MHZ is a size used for IF, but micros also use various size Crystals for specific purposes. A 10.7 MHZ Resonator (or Crystal) will give you almost 3% less error in RS232 data transmission at 57600 baud than a 10 Mhz Resonator (or Crystal). I don't know what OP purchased since I am not clairvoyant, but I would be surprised if it did not work for this purpose. Even a digital gate based clock will work for a micro.
MP -
PICs can run hot with no current limiting. Since this program is sending out a pulse and not a steady DC voltage, there is no danger to the PIC. It will just run warmer at certain duty cycles.
Personally, I like to use resistors on the output pins of microcontrollers. I am just saying that the "no resistor" version will work.
MP -
You have a wideband tuned circuit for shaping the IF of an FM radio. A microcontroller uses a narrowband resonator that is like a quartz crystal. Try the one you have, it might work.
Actually, that is not so. What he has is also used for microcontrollers. They are perfect for this application and much cheaper than a crystal. Just ground the middle pin and either of the outside pins can be connected to either of the clock pins on the micro. I have a drawer full of these for this application. I never use a crystal for a micro project, except for specific conditions where I need it. Resonators are commonly used instead of crystals. They take up less space on the pc board since you do not need the capacitors. It also sometimes eliminates routing problems on a pc board.
...of course, mine are much smaller than Hotwaterwizard's resonators ;D
MP -
Here is a calculator:
http://daycounter.com/Calculators/SkinEffect/Skin-Effect-Calculator.phtml
MP -
Although 10K is a bit more than I would use, either way is fine since the source is a PIC. The project is ok as is.
MP -
Your circuit is a standard level converter, but the resistor values are high for connection to micro. Try 10K instead of 100K and 3K3 instead of 4K7. Also, the PC should be connected to the 10K and the micro should be connected to the pin marked TTL. Note that this is a one way communication from the PC to the micro.
MP -
The second power source that you posted a link uses the same circuit as our project here: http://www.electronics-lab.com/projects/power/010/index.html
Might as well just build it rather than buy it. I f you just want to jump in, either of these would be good starters. The breadboard is ok, too. It is nice to have one with banana jacks so you don't have loose power supply wires ready to pop out of a breadboard and short things out.
MP -
Here is an interesting project done at cornell university:
http://instruct1.cit.cornell.edu/courses/ee476/FinalProjects/s2006/XL76_SL362/XL76%20SL362/index.html
MP -
sundar,
The filter that was posted by audioguru will give you more attenuation than the bandpass filter posted. The reason bandpass will not give you the results you want is that Q is inversely proportional to Bandwidth. As you increase the bandwidth of a bandpass filter (300 to 3K is a wide bandwidth), you lose the Q, which directly effects the amount of cut or boost in a filter.
The Sams circuit posted above is a standard speech filter used in many applications. I have used the same schematic, only different resistor and capacitor values.
To get an even better cut point, you can build high order low pass and high pass filters which are in the 3rd or 4th order and just connect them together like in the Sams design.
As sarma has mentioned, once you get rid of the frequencies that do not hold voice, how will you determine what is voice content and what is something else in the 300 to 3K range? Just curious.
MP -
"Ground" and "Earth" are actually two different things, but can be at the same potential. In other words, the ground of your circuit does not have to be connected to earth ground, which is the potential of the return or ground of the mains in your service box on the house. This is always at Earth Ground because it is connected to a rod that is driven into the ground. There are many situations where your chassis ground or case ground on the instrument would not be at the same potential as earth. There are also instances where you want a different supply ground or circuit ground than the earth ground or the chassis ground. Thus terms such as chassis ground and common come into play. When these potentials are different, the schematic will use different symbols to denote zero volts, common, analog ground, digital ground, chassis ground, and earth ground. Using different symbols to sort these out keeps this from getting too confusing.
MP -
N4, if you have a good quality voltmeter, you can measure the voltage directly. Most will measure 1000 and some better quality will measure 2000 volts. Check the specs on the one you are using. You might be surprised to find you already have everything you need.
MP -
You need the same ground or you will have different voltage potentials for the two sections of the circuit. Check the voltage difference between the commons. There should be no voltage difference. It should be "Common" to both parts of your circuit.
MP -
sundar,
You did not mention how much attenuation/rejection is needed. If you need to eliminate the frequencies above and below these set points, you will need a high order filter. Neither of these designs are high order. They will give you some attenuation, but not rejection. Will this work for you? You did not mention much about the purpose of the design.
MP -
xerex,
The 4047 is only giving clock signals of 50 or 60 hz which are complimentary to each other. If you cannot find a 4047, the same could be achieved with a 555 and an inverter chip.
MP -
Yes. There are several ways to do this. Voltage control has to be built in as part of the circuit. It is rarely an add-on. In the most basic type of this design, you can use the bandpass section of a state variable filter and use a voltage variable resistance instead of a pot. Can you post the circuit that you are currently using? Voltage Controlled filters can be made in a very wide variety of types. The auto-wah is also known as an envelope filter.
MP -
FINE MP
i am reminded of FOOL or JOKE circuits that used to apper in the Summer circuits edition of ELEKTOR magazine (NL based)
there aslo we used to find one or two absurd circuits and an almost convincing write-up even-- i agree we need some lighter coner to relx
sarma
I have never seen one of them. I don't mean to take this off-topic, but if you happen to still have one or more of these magazines, it would be amusing to see some of these joke articles. Of course, it should appear as a new topic.
MP
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sarma,
Thanks for the elaboration, but I was actually making a joke based on the old electronics addage that all electronic components have smoke in them and if you let the smoke out, they will stop working... of course, we all know that this is not where the smoke comes from.
MP -
However......if the diode is in-circuit and powered up when you short it, you run the possibility of letting the smoke out.... ;D
MP -
ante, I turned the avatars off because I did not like seeing someone's favorite car, favorite girl in a bathing suit, animation, donald duck, superhero cartoon, or anything else that takes up space on the screen or takes time to load up or just flat out looks ugly to me. To go further on what you were asking, I think that since the ability to turn off the avatar is there, no one should be angry about what avatars members use. Just turn them off and you don't have to see it. Just like programs on TV that you do not want to watch. You just turn it off.
I suggest that you talk to mixos on this because I do not have the authority or means on this website to do anything about it. Mixos does.
MP
MCU Code extract engineering
in Sell/Buy electronics - Job offer/requests
Posted
Since this is more related to the author's paid services, it has been moved from the micro forum to the buy/sell forum. Please keep all advertisements for paid services in the buy/sell forum.
MP