If you find it won't drive 100' of cable unbalanced, you can try a balanced line driver between the capsule and the 100' balanced mic cable. I'm not sure it will work for as long as 100' but it might: the output impedance is low as there's a FET built into the capsule. Generally, I use a short length (an inch or less) of twisted-pair unshielded (it's hard if not impossible to solder coaxial wire directly to the capsule) and connect that to RG-174 coaxial for tens of feet or more. I haven't gone as far as 100', but I have used tightly twisted pair wires for 20' with no hum problems. I would guess that the schoeps circuit is best, after all, and I needn't reinvent the wheel, especially as a newbie. 1000 PANASONIC WM-61A OMNI DIRECTIONAL MINI ELECTRET CONDENSER MIC. (2) 2 product ratings - PANASONIC AG-MC200 MICROPHONE PARTS, REPAIR ONLY. In some cases I will be running more than 100' of mic cable. PANASONIC AG-MC200 MICROPHONE PARTS, REPAIR ONLY. The Mics Panasonic WM-61a (discontinued) This inexpensive 6mm omni capsule was ubiquitous in commercial and DIY mic designs for years, but is sadly discontinued around 2013. I had ordered the units used for testing from Digi-Key (part number P9925-ND) at the. Back electret type designed for high resistance to vibrations. Running long cables from an unbalanced mic source. hot The Knowles MEMS mic reaches highest, but has a more uneven response and is quite difficult to solder, power and mount. This gave me the opportunity to test the Panasonic WM-61A omnidirectional back electret microphone cartridge. Also renowned for its use with the Linkwitz modification for DIY recording projects as shown in our photo. Frying the capsule with too much voltage. I guess I'm too scattered to mention that I am worried about two things:ฤก. They are different capsules with different specifications as summarised in the table below, the figures are from the respective manufacturers specifications. Primo suggests the EM258 as a possible replacement for the Panasonic WM-61A. Mike Jaspers wrote on Mon, 16 August 2010 13:24 Primo Microphone Capsules > Primo EM258 6mm Omni Electret Capsule. The complete microphone setup is uses a Panasonic WM-61A electret microphone capsule and a battery powered pre-amplifier giving a low impedance line level Microphone Amplifier This little amp is reliable when using electret microphones.