Date: Sun, 12 Dec 1999 09:51:07 -0500 From: "J. Coon" <[EMAIL PROTECTED]> Subject: Re: MD: Build you own $100 Mics - Cheap! Since the minidisc recorders have "plug in power" in the mike circuit, you can simplify the circuit and eliminate the battery, resistors and capacitors and wire the capsules directly. Also, sometimes it is more convenient to not have to mess with cables. So, here is a T mike that I designed http://www.tir.com/~liteways/Mandolin.html#Microphone It may be a little easier to build. Take your pick. I don't know if your capsules are the larger ones or the small ones, but the should be able to work in either design. Jeff Medin wrote: > > I have some matched PANASONIC mic capsules for sale under MICROPHONES at > the MD Classified page. Build your own Mics! Check out > "http://www.arches.uga.edu/~tidmarsh/binmic.html" > > These are the capsules you will need AND they are already MATCHED FOR > YOU! > > Jeff ------------------------------------------------------------------------ Jim there are some distinct ADVANTAGES to using the External Mike Battery Power as described in Tidmarshs' article. 1). Internal MD mike power is low on most MD machines. The Microphone sensitivity of electret Mics (almost always) goes down (by 1/2 or more!) when using only the meager 1.5 Volts (or so) provided by the MD player at the "MIC INPUT" on the MD recorder. NOTE:The "MIC INPUT" is usually much more sensitive for "softer" source material because it usually has an amplifier associated with it to pick up those hard to hear sounds. This is good for soft music or lectures and such. 2). You can record LOUDER sounds (those with MUCH HIGHER SPL -- Sound Pressure Levels) using the Battery Box. This is because the Mic will not distort as easily with loud sounds, because it has more voltage (9 volts vs. 1.5) powering the Mic element, allowing better performance. Using a Battery Box/Mic Combo plugged into the "LINE INPUT" (NOT the "MIC INPUT"!) will give you a much better recording at any type of "loud" concert or event where sounds are louder than "normal" and vary widely. 3). The DYNAMIC RANGE of the (un-powered) "LINE INPUT" (where you plug the Mics & battery box in) is SUBSTANTIALLY larger than that of the (powered) "MIC INPUT". If you are going to do ANY type of recording with a large dynamic range, you WANT to use the "LINE IN". But because it does not supply power to the Mics like the "MIC IN" does, hence the need for the added circuitry. Using a battery box at a concert means that you can basically set the recording level for the LOUDEST thing your gonna hear and set it somewhere between -4 and 0 dB. Then put your MD in your pocket and enjoy the WHOLE show. Among the problems already mentioned, by using the "MIC INPUT", you will be adjusting the recording levels every few seconds. In closing, the merits of the PANASONIC WM6x mic capsules are well known throughout the industry. That is why some companies use THESE Mic capsules to make Mics that cost from 100 to over 200 dollars! People "in-the-know" specify and use ONLY THE PANASONIC WM6x and use them by the zillions! The Mics (capsules) are about the size of a pencil eraser -- I think it's something like 6 mm Diameter X 5mm for the WM60A's Jeff ----------------------------------------------------------------- To stop getting this list send a message containing just the word "unsubscribe" to [EMAIL PROTECTED]
