--_003_AANLkTinvOBSiJp3ErgZjc70eZunuNvRhYmex3znTc4mailgmailcom_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable >> I was wondering if anyone knew of active microphone filter software, >> something that can actively filter out low frequencies? > See attached. This response is incredibly sloppy and incompetent. The op asked for a software solution but a hardware one was provided. The diagram has no information block and title. Date, originator, time of last coffee break and number of sheets are not given, just to take a representative sample of defects. Components are shown but there is no indication of component values, or types, or tolerances, or any guidance as to how appropriate values may be able to be arrived at. For example the capacitor may be required to be ceramic, or mylar, or polystyrene, or polyproplylene, or poly-2-ol-di-methyl-ketoxy-parabutadiene. Or something else. Is the resistor wattage rating relevant - would an 0805 or smaller package be acceptable or does it need to be wirewound, and if the latter is heatsinking required and if so how many degrees per Watt. If a wirewound resistor is required, are inductive effects relevant? There are labels "In" and "Out" but nothing to show actual termination points. Just because the labels are near the end of a line does not mean that a constructor can be sure that connection is actually intended. Such sloppy presentation and uncertain meaning makes the diagram useless and indeed highly dangerous to users who think correctly. It's not even obvious that the diagram will wrap correctly at 80 characters. Having a hard line break after "OUT" would avoid this issue and the amount of work require is small compared to the gains liable to be made. The items labelled R1 and C1 are recognisable as probably corresponding to standard components but what is the funny filled in triangle shape at the bottom? It doesn't correspond to a standard connector and the symbol is non standard for any other purpose. It only has a single connection, which doesn't make any sense. Is it a monopole or an infinite sink (or source) or does it work by waving dead fish at full moon? It may be meant to be an adjustable precision zener, which would be equally stupid. Most redeculous of all is the complete and utter lack of any circuit description. How does it work? What is it supposed to do? Is it dangerous if left lying around the house. Some clue as to construction and layout, while not absolutely essential, can be expected if you want to be seen as a competent engineer. Is layout critical, are there any feedback paths induced through spurious couplings if it is not built correctly, does it have to be built with some or all components facing true North, or magnetic North, or Lunar north. Are there any special conditions? A proper engineer will think about this sort of aspect in advance and will not waste the valuable time of 2,000 list members, and the 100,000 or so who may view it on Nabble at some stage, and the billion or more people on the web who are liable to have access to it sooner or later. You need to remember that data is now persistent and this circuit may be around for 10 or 20 years, so you have to do justice to the people whose time you may be wasting by doing it the way you have. Engineering is a serious business and you cannot take your social and moral responsibilities so lightly. You have a lot to learn if you want to become a top flight engineer in this lifetime. You should also spilling-chuck your posts before you send them. There is no indication anywhere in your post, not in either word, that you have done so. People should not need to wonder about misspillings when trying to understand your circuits and what it is that you are feebly struggling to say. I'd complain about the pathetic commenting, bad indenting, lack of clear and consistent variable naming and of general logical rigor if there were any such to critique. If this had been a software solution, as requested, it would have made this aspect of reviewing a lot easier. You have to think ahead about the implications of making changes such as this. To you the change from software to hardware may have seemed trivial, but the consequent lack of comments and code to critique can be very upsetting to a certain class of readers/reviewers. I could go on and on and on and on and on but I think everyone here knows where everyone is coming from and that should be enough. I'm not going to waste my valuable time picking further holes in your pathetic attempt at a solution when I have real work to do. One last time, in case you've forgotten or didn't pay attention - People proposing solutions need to know that if they don't do so in a consistent and meaningless manner then they are wasting the time of 2000+ highly skilled professionals who have better things to do with their time than trying to work out how the circuit is meant to work. So a D for effort and a C- for execution. Do try harder next time. RM JoAT, MoEE. --_003_AANLkTinvOBSiJp3ErgZjc70eZunuNvRhYmex3znTc4mailgmailcom_ Content-Type: image/gif; name="a.gif" Content-Description: a.gif Content-Disposition: attachment; filename="a.gif"; size=1629; creation-date="Wed, 01 Dec 2010 12:51:35 GMT"; modification-date="Wed, 01 Dec 2010 12:51:35 GMT" Content-Transfer-Encoding: base64 R0lGODlhyQChAPcAMQAAAAEBAQICAgMDAwQEBAUFBQYGBgcHBwgICAkJCQoKCgsLCwwMDA0NDQ4O Dg8PDxAQEBERERISEhMTExQUFBUVFRYWFhcXFxgYGBkZGRoaGhsbGxwcHB0dHR4eHh8fHyAgICEh ISIiIiMjIyQkJCUlJSYmJicnJygoKCkpKSoqKisrKywsLC0tLS4uLi8vLzAwMDExMTIyMjMzMzQ0 NDU1NTY2Njc3Nzg4ODk5OTo6Ojs7Ozw8PD09PT4+Pj8/P0BAQEFBQUJCQkNDQ0REREVFRUZGRkdH R0hISElJSUpKSktLS0xMTE1NTU5OTk9PT1BQUFFRUVJSUlNTU1RUVFVVVVZWVldXV1hYWFlZWVpa WltbW1xcXF1dXV5eXl9fX2BgYGFhYWJiYmNjY2RkZGVlZWZmZmdnZ2hoaGlpaWpqamtra2xsbG1t bW5ubm9vb3BwcHFxcXJycnNzc3R0dHV1dXZ2dnd3d3h4eHl5eXp6ent7e3x8fH19fX5+fn9/f4CA gIGBgYKCgoODg4SEhIWFhYaGhoeHh4iIiImJiYqKiouLi4yMjI2NjY6Ojo+Pj5CQkJGRkZKSkpOT k5SUlJWVlZaWlpeXl5iYmJmZmZqampubm5ycnJ2dnZ6enp+fn6CgoKGhoaKioqOjo6SkpKWlpaam pqenp6ioqKmpqaqqqqurq6ysrK2tra6urq+vr7CwsLGxsbKysrOzs7S0tLW1tba2tre3t7i4uLm5 ubq6uru7u7y8vL29vb6+vr+/v8DAwMHBwcLCwsPDw8TExMXFxcbGxsfHx8jIyMnJycrKysvLy8zM zM3Nzc7Ozs/Pz9DQ0NHR0dLS0tPT09TU1NXV1dbW1tfX19jY2NnZ2dra2tvb29zc3N3d3d7e3t/f 3+Dg4OHh4eLi4uPj4+Tk5OXl5ebm5ufn5+jo6Onp6erq6uvr6+zs7O3t7e7u7u/v7/Dw8PHx8fLy 8vPz8/T09PX19fb29vf39/j4+Pn5+fr6+vv7+/z8/P39/f7+/v///ywAAAAAyQChAAAI/wD/CRxI sKDBgwgTKlzIsKHDhxAjSpxIsaLFixgzatzIsaPHjyBDihxJsqTJkyhTqlzJsqXLlzBjypxJs6bN mzhz6tzJsySAnz8PAuhJtKjAoQORJlVqtOlNpkcJBnVKtSbUgkOvVt3KUmvUf165ijUZNunYsyrL fkXLlqRasG3jinz7Vq5diVeh1r3Lt6Feg3v7Ck4IdOrRwkAHK17MuLHjx5AjS9VrWLJlsJQDX+Zb GbPmzXY7JwYtWXRn0o1Nf0bNVjVryK5fb0S81qzL2KkLSwV8GPFepqJf4mYM3PZurBGB/72d2XHe 2tDhQixenDnW04KfSz/O3WF1pas7Dv+fiz2ldu3d/R4HL7y5W923eW83Tl+9caThOY7/6Du/xvPy pcdQdVHl1d+BCCZ44HUKNujggxBGSFt90qFH4UIEHtYeg+9N2JV8FkaHYXrlnbQff/C1dN5yAhIG X4hpuddhTL4xiJ1/OJ0IEo6yzSajWz3CpCN/QW44GY/TFWndkSYqqeKPIyHpJEVDeiTllHhBOReW MXJIFpfmaRnSlWAWRWaZPZ2J5k5qrplTm24+FedgcM5JU512yoRnnkLuyaeRf8pVYqBcDUpoVX4e amKiir7XqFiGPspmWTUKJWlXdCF33aVhehcgXIxyilmSmlYoqqOkrnfhqVYGBmOorEb/Ol90sLI6 qkL9WWorSiVm2OKuUWrl66rABluqiLUWOxmF+OWqLFnJPptctNI+JGu1K12LbafbWkVtt7h+C66L 4z4lbrnkonvnueoCxm67y8JL47vy3lpvtvSiq+29+uVb7r78/ufvuAAHjFHBBl+EcMIHD6zuwgxb BHHEEzn8L8VNYuyTxhtzHKXHH4M8psgjk0ykyVainLLK+rHcssv/wRyzzAfTXLPNEuOcs85U8tyz z3gBHbTQqRJtn9FHIz2i0gMy3bTTuEIdtdQIWUww1VVjravWvwItoYc0fz2azmIL/TXRECr9INMN Qp0g1QvCXSnWYNM9NtcTc6333nzbAhUQADs= --_003_AANLkTinvOBSiJp3ErgZjc70eZunuNvRhYmex3znTc4mailgmailcom_ Content-Type: text/plain; name="ATT00001.txt" Content-Description: ATT00001.txt Content-Disposition: attachment; filename="ATT00001.txt"; size=208; creation-date="Wed, 01 Dec 2010 12:51:35 GMT"; modification-date="Wed, 01 Dec 2010 12:51:35 GMT" Content-Transfer-Encoding: base64 LS0gDQpodHRwOi8vd3d3LnBpY2xpc3QuY29tIFBJQy9TWCBGQVEgJiBsaXN0IGFyY2hpdmUNClZp ZXcvY2hhbmdlIHlvdXIgbWVtYmVyc2hpcCBvcHRpb25zIGF0DQpodHRwOi8vbWFpbG1hbi5taXQu ZWR1L21haWxtYW4vbGlzdGluZm8vcGljbGlzdA0K --_003_AANLkTinvOBSiJp3ErgZjc70eZunuNvRhYmex3znTc4mailgmailcom_-- .