... Thanks Mr. Helmke. I've got a circuit GIF which I think is yours. It says Schematic for "Alice" microphone by Scott Helmke on the bottom & uses 2n4416 &...
... I should say "increase the acoustic resistance for access to the back of the capsule". -- No virus found in this outgoing message. Checked by AVG Free...
The problem with phase testing of is reliable source, not the measurement techniques. For non-polarized capsules, there is a device that excites the diaphram...
That sounds like the current schematic, which can be found at http://www.scotthelmke.com/alice-schematic.jpg I thought this whole polarity thing through a...
... I just take a known-correct SM57 and a polarity flipping XLR adapter, mix the mics, play with the gain and see which way I get cancellation. Even though...
I just built a couple of microphones based around the TSB 2555A electret capsule and the Scott Dorsey electronics (minus the biasing circuit) In the files...
I like the housing, though I wonder how the directional pattern of the capsule is affected by being mounted in a closed space. -Scott ... -- ... And you'll...
Are these "Chinese large diameter elements from Dave Thomas" alos battery powered electrets? Hope so! Thanks...Joey D! "Mike N." <miken277@...> wrote:...
... battery powered electrets? Hope so! Thanks...Joey D! ... No. They are removed from the Apex 460 microphones, when Thomas does the well known Peluso...
... Darren, if youıre going to try to build and sell microphones of any sort it would be in your best interest to learn ohmıs law... And of course, do your ...
I have no intentions what so ever of copying anyone's circuit designs. I just quiried about the 48 volts because the specs say 10 volt limit. I know the mics...
Darren, I will present one way of dropping 48v to roughly 9v... Iıll use only one resistor the value of which will depend of course on your phantom supply...
... Er, no. You want the resistor to drop 39V - the difference between the 48V supply and the 9V needed for the microphone. Therefore the calculation is 39 /...
... For the impulse response methods, the source is not critical as long as it's broadband and will give good S/N. Electrostatic excitation is used for...
Happy New Year Richard! Thanks for the detailed summary of microphone measurements. I would be interested in finding out more if you decide to write up your ...
... G.R.A.S. Sound & Vibration was founded in 1994 by Gunnar Rasmussen formerly of B&K. It must be rated as at least equal to B&K when it comes to measurement ...
Hi All, I could agree more. I have known Gunnar for 30 years and his G.R.A.S microphones are fabulous. The 1/4" one that I have is my gold standard for ...
Electrostatic excitation goes up to 100KHz, I don't think that is necessary for sensitivity measurements only. Kims calibration are good for generic testing....
Bob Cain used to be a regular contributor here, and he was doing some fairly good mic testing with a swept-tone rig. The tone (and corresponding filtering on...
... CLIO is limited to 44.1KHz sample rate is what I am told.< It's too bad Cooledit is gone. I use my copy and had the foresight to download the plugin SDK....
Mike, have you references for the Dorsey & N2 circuits? -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.432 / Virus...
... Gunnar wrote some of the B&K Tech Review articles I'm thinking about. I would be happy to use any of his measurement mikes whether from B&K or GRAS days. ...
Hi All, From: Richard Lee <ricardo@...> ... comparison. I believe that also. The real response of a condenser microphone to pressure follows closely...
Hi All, I located the data sheet from my G.R.A.S. 1/4in capsule, type 40BF. The pressure peak is ~9dB at ~60KHz using the electrostatic actuator. However, the...
... to 192kHz. IMHO this is unnecessary for most measurements. But there doesn't seem to be cheap (free) software to do this. ... I believe there is a DSP in...
