Electret Condenser Microphone Cartridge Mic Element Various Cardioid and Omnidhmsdayhourhours. FREE shipping. See item description+ See item description for shipping. Approximately: (Enter ##1## or more)(Enter more than ##1##)Your max bid: You've been outbid. Don't let it get away - place another bid. You've been outbid by an automatic bid placed earlier by another bidder. You're the highest bidder on this item! ![]() You're the first bidder on this item! You're the highest bidder on this item, but you're close to being outbid. This auction is almost over and you're currently the high bidder. ![]() You're the high bidder on this item, but the reserve price hasn't been met yet. You've been outbid by someone else. You can still win! Try bidding again. You've been outbid by someone else's max bid. You can still win! Omnidirectional Back Electret Condenser Microphone Cartridge Series: WM-61A WM-61B (pin type). Procedure for 3 wire linkwitz modification of the Panasonic WM-61A electret condenser capsule. Changes I made were to use an Omnidirectional Panasonic WM-61A Mic cartridge which has a freq range of 20-20kHz. Panasonic WM-61 Specs (PDF format). Panasonic Electronics, Corded & Cordless Phones, Digital Cameras & Camcorders, TV. We're so excited you registered with FactoryOutletStore.com. WM-61A Small microphone for general use Back electrettype designed for high resistance to vibrations, High sensitivity, high signal to noise ratio. WM-61 datasheet, cross reference, circuit and application notes in pdf format. Omnidirectional Back Electret Condenser Microphone Cartridge. WM-61A WM-61B 3.4 1.5 . Panasonic Electronic Components. Preview: Wm-61a - panasonic uploaded on 2014-04-01 with 72.3 KB.The total views of the this pdf preview with title wm-61a - panasonic is 42 times which last read at. SUGGESTED REPLACEMENT: WM-61A Series (no pin type) Panasonic Industrial Company, Product Management Division – Components Group Two Panasonic Way, M/S. WM-61A datasheet pdf,WM-61A pdf.MICROPHONE CARTRIDGE 6MM OMNI,Selling leads from all over the world. Vendor: Panasonic - ECG Category: Audio Products. Try bidding again. Your bid wasn't accepted because it's the same as someone else's bid. Try raising your max bid. You're the highest bidder! To increase your chances of winning, try raising your bid. You're the first bidder. Good Luck! You're still the highest bidder! You increased your max bid to Please enter your bid again. Enter a valid amount for your bid. Enter a bid that is the minimum bid amount or higher. You have to bid at least Sorry, you can't lower your maximum bid once it's placed. Your bid is the same as or more than the Buy It Now price. You can save time and money by buying it now. Place bid. Review and confirm your bid. Bid confirmation. Increase max bid. Enter a custom max bid more than ##2##Enter a custom max bid of ##2## or more+ ##2## approximate import charges##2## (approximately)Please enter a higher amount than the current bid.+ ##2## for shipping+ FREE SHIPPINGBid ##3## now. Using the Panasonic WM6. A as a Measurement Microphone. Measurement microphones are an indispensable tool for the. Measurement microphones. Hz., and above 2. Hz.,) and do not have . They are also optimized for measuring high SPL. Measurement microphones retail for US $1. US $5. 00. but very adequate measurement microphones can be made using. Panasonic WM6. 1A. Digi- Key, part number P9. ND. for under US $2. For simple measurements, (i. SPLs. greater than 6. B, and less than 1. B,) the WM6. 1A. can be interfaced directly to a PC's sound Figure I. Interfacing the Panasonic WM6. A Electret Microphone to the Sound. Blaster CT4. 81. 0 PC Sound Card. Figure I, (which is available in larger size jpeg. Panasonic. Electret Microphone cartridge to the Sound. Blaster CT4. 81. 0 PC. Sound Card, including approximate signal voltage levels. The WM6. 1A. is quite small, (6 mm in diameter, 4 mm height,) and a. Figure II. Construction of a Measurement Microphone Using the Panasonic WM6. A Electret Cartridge. Figure II, (which is available in larger size jpeg. Measurement Microphone. Panasonic WM6. 1A. Electret cartridge. The electret cartridge should be covered. I use GE's Silicon II, Household. Glue- which is available in the paint department of home. The wires. should be soldered to the cartridge first, cut to length, and. The measurement microphone is specified at - 3. B +/- 4 d. B. (0 d. B = 1 V / Pa,) with an load resistance of 2. K, and 1 Pa. is 9. B SPL. or 9. 4 d. B SPL. produces 1. V across the 2. 2. K load resistance, (9 m. V across. two 2. 2. K resistors in parallel = 1. K.) Note: with a load. K resistors in parallel, (or 1. K,) and. the tip and ring shorted, 1. B SPL. produced a measured 1. V signal at input to the sound card. B FS. Figure III. WM6. 1A Typical Frequency Response. Figure III is a plot of the frequency response of a typical. WM6. 1A. However, there appears to be a zero in the transfer. Hz., (causing the response to be high by. B at 7. 5 k. Hz., which could be canceled in the. Hz.)The microphone is quite good, (within its SPL. Baudline FFT. time- frequency browser designed for scientific visualization. Xoscope, turning. PC into an audio analysis system. Ray Carlisle. has developed a Spicecircuit. WM6. 1A. electret microphone using LTSpice. Linear Technology. The. simulations agree reasonably well with the empirical. Ruslan Migirov contacted the Panasonic corporation. FET part number for the Japanese version of the WM6. A. is 2. SK1. 23. Amplifier for the Panasonic WM6. A. Electret Microphone: Figure IV. Schematic of the Amplifier for the Panasonic WM6. A Electret Microphone. Figure IV, (which is available in larger size jpeg. Panasonic. Electret Microphone. Almost any operational amplifier will. JFET gain is quite high, (so amplifier noise. Linear Technology. LT1. 67. 7. is a good choice because of its common mode input range. They are. available on the Linear. Technology site for under US $3. A less expensive. TLC2. 72. from Texas Instruments. It is. a dual, (the other channel is not used- and may be used as a. Newark for under US $0. It is a linear CMOS design, and has inferior noise. Hz. The TLC2. 72. Bu = 0. 7. 75 V RMS across. Bm = 0. 7. 75 V RMS across 6. Ohms = 1 m. W = - 1. B. FS, as per EBU R6. Ohm resistor in the. Ohms. total.)The amplifier circuit is adaptable- the only modification. JFET load resistor. It should be selected such that the worst. A, for the 2. SK3. JFET,) should pull. V below. the rail for common mode input operation of the operational. Likewise, the worst case maximum idss, (4. A, for. the 2. SK3. JFET,) should not pull the voltage across the load. V above ground, for all. This is a very conservative circuit design over. An alternative. electret cartridge interface is shown that is DC coupled to. The WM6. 1A. data sheet does not offer worst case temperature. DC coupled bias circuit can not be determined. Also shown is a simple gain trim, (for the +/- 4 d. B gain. tolerance of the WM6. A,). that replaces the 2. K resistor and 1. F capacitor in the. Figure V. Complete Schematic of the Amplifier for the Panasonic WM6. A Electret Microphone. Figure V, (which is available in larger size jpeg. Panasonic WM6. 1A. Electret Microphone. The component bill of materials is about. US $1. 0, and all components are available on line. Note the use. of 4. V, (3 X AA batteries- which can be rechargeable. Direct. Coupled Stereo Headphone Amplifier.) Note, also, that no. MTBF. characteristics. Alternatively, the power could be provided by. PC sound card, (5 and 1. Volts are available from the. PC power supply. busses.) Also, if 6 Volts can be used, (4 X AA batteries,) a 3. Volt tap can be used for an artificial ground for the. F polyester capacitor- which is the most. Figure VI. Alternative Schematic of the Amplifier for the Panasonic WM6. A Electret Microphone. Figure VI, (which is available in larger size jpeg. Panasonic WM6. 1A. Electret Microphone. The component bill of materials is a. US $1. 0, and all components are available on. The 1/f noise break frequency of the WM6. A. cartridge is about 5. Hz., (as measured by Baudline,) which is about. TLC2. 72. making the noise contributed by the operational amplifier. This is probably the simplest schematic. Figure VII. A More Elaborate Schematic of the Amplifier for the Panasonic WM6. A Electret Microphone. Figure VII, (which is available in larger size jpeg. Panasonic WM6. 1A. Electret Microphone. The component bill of materials is still. US $1. 0, (and all components are available on line. BOM consists of fairly high quality components that are easy. TL4. 31. shunt regulator to provide a stable, above ground, reference. Only one of the TLC2. TL4. 31.). A gain trim can be added by reducing the value of the 2. K. resistor, and adding a potentiometer connected as a rheostat. TL4. 31. The other two. As an alternative power supply, the amplifier. Volt . Ideally, it should be a constant. But there is a simple way to cancel the non- linear. JFET amplifier. From semiconductor device physics, the id vs. Linearizing the Panasonic WM6. A Electret Microphone. Figure VIII, (which is available in larger size jpeg. Panasonic. Electret Microphone. From the 2. SK3. 37. JFET data sheet, 1. A < = idss < =. A, (as a worst case design at 2. C- which will be much. B worst case specification for the WM6. A,). and from the typical graph for id vs. From the 2. SK3. 37. SK3. 37. 2 devices used in the WM6. A. 1. 01. 0 < = 1 / gm < = 2. B in gain. vpo = (2 * 0. Which agrees favorably with the graph in the data sheet for. SK3. 37. 2, (the maximum and minimum vpo are not listed.) The. B below 1 Volt for 9. B SPL. or 1. 2. 9 m. V. The maximum signal before clipping, (i. V,) would be 9. 4 + 2. B SPL. worst case. The noise voltage at the output. WM6. 1A. would be about 8. B, (6. 2 d. B below 9. B SPL. according to the data sheet,) below 2. V, or about 1 u. V. The. noise figure of the 2. N5. 48. 4. is 3 d. B, or the input noise voltage to the amplifier would be. V, giving a dynamic range of 8. B. Figure IX. Amplifier for the Linearized Panasonic WM6. A Electret Microphone. Figure IX, (which is available in larger size jpeg. Panasonic WM6. 1A. Electret Microphone. Note the usage of Linear Technology. LT1. 67. 7. operational amplifier, (which has an application for the WM6. A. in the data sheet,) and the direct coupling of the microphone. The amplifier is necessary for noise. B. At a minimum, the microphone will work, linearly. B SPL. which is the maximum, worst- case, that the WM6. A. is capable of, (cherry picking the microphone. B SPL. limited by forward biasing the gate- source PN junction.)Figure X. Self Biased Amplifier for the Linearized Panasonic WM6. A Electret Microphone. Figure X, (which is available in larger size jpeg. Panasonic WM6. 1A. Electret Microphone. Note that the 2. N5. TC for vgs vs. Usually. JFETs are operated in the saturation region. But note that vpo can be larger than 2. Volts, meaning that. Ohmic region of its. For operation in the saturated region, (vds > vpo +. And the small signal gain, g, is. For a typical gm of 1 / 1. Ohms. the typical gain is 0. For operation in the Ohmic region, (vds < (vgs + vpo) /. Where the on resistance of the JFET is rds, and rl and rds. JFET in the WM6. 1A. Figure. I.)To find the gain of the JFET when operated in its Ohmic. Ohmic. region of operation,) developing a drain- source voltage, vds. This is why the WM6. A. will operate over a large range of vpo, idss, and Figure XI. Self Biased Test Amplifier for the Panasonic WM6. A Electret Microphone. Figure XI, (which is available in larger size jpeg. Panasonic WM6. 1A. Electret Microphone. This is a very versatile amplifier. For. example, removing the 1. F capacitor, and replacing the. Ohm resistor with a 1. K, will operate the WM6. A's. JFET in its Ohmic region, (guaranteed, worst case, over make. C.) The difference between Ohmic and saturated. C, to operate in the JFET's saturated region with a. Ohm resistor,) can be tested by shunting the 1. K with. the 4. 42. Ohm resistor. The 1. K resistor provides a nearly. A current through the JFET which will have a. JFET's parameters, (about +/- 8 d. B,) with about 2. V nominal. output at 1. B SPL. The ratio of the second order term and the linear. Letting vgs = A sin(wt), and vgs^2 = (A. A^2 / 2 ) * (1 - cos(2wt)), and dropping the DC. D. D = (idss * ((A / vpo)^2 / 2)) / (idss * (2 * (A / vpo))). D = (A / vpo / 2)^2) / (2 * (A / vpo)). D = ((A^2) / (vpo^2) / 2) / (2 * (A / vpo)). D = A / (4 * vpo). Which means for low distortion, A must be small, and/or. For example, at 9. B SPL. A is about 1. V, and if vpo is 0. Volt, the second order. B. linearization would not be required. As a closing note, this section is about linearizing the WM6. A. microphone cartridge for digital signal processing of sound. This may not be desirable for all cases- for example. OSHA. 1. 91. 0. 9. Evaluation of Panasonic WM6. A Measurement Microphones: Seven of WM6. A. measurement microphones were chosen, at random, for. The evaluation test set up consisted of two identical Linux. PCs, each with an Ensonic/Sound. Blaster CT4. 81. 0 sound card. The. first machine generated a 9.
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