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Rough guess at these impedances...
HI
Anyone know or care to guess what the typical impedance of a condenser mic is? -- "What is now proved was once only imagin'd." - William Blake, 1793. |
On Tue, 11 May 2004 19:49:18 +0100, Paul Burridge
wrote: HI Anyone know or care to guess what the typical impedance of a condenser mic is? 1 / (2*pi*f*c) John |
On Tue, 11 May 2004 19:49:18 +0100, Paul Burridge
wrote: HI Anyone know or care to guess what the typical impedance of a condenser mic is? 1 / (2*pi*f*c) John |
On Tue, 11 May 2004 19:49:18 +0100, Paul Burridge
wrote: HI Anyone know or care to guess what the typical impedance of a condenser mic is? I'll assume you mean an electret type microphone? I don't know of anyone who makes a condensor microphone anymore. Those things take 500 volts of extremely well filtered DC and the impedance is purely the capacitance of the plates. Crooners hated them in the old days because if the stage electrician screwed up, they could get the entire 500 volts on their lips as they 'kissed' the microphone. Figure 2.2k to 4.7k for electrets with three wires. On two wire types, set the impedance with the bias resistor size. You can get more sensitivity by increasing the drain resistor, but you sacrifice high frequency response and dynamic range if you go too far with it. |
On Tue, 11 May 2004 19:49:18 +0100, Paul Burridge
wrote: HI Anyone know or care to guess what the typical impedance of a condenser mic is? I'll assume you mean an electret type microphone? I don't know of anyone who makes a condensor microphone anymore. Those things take 500 volts of extremely well filtered DC and the impedance is purely the capacitance of the plates. Crooners hated them in the old days because if the stage electrician screwed up, they could get the entire 500 volts on their lips as they 'kissed' the microphone. Figure 2.2k to 4.7k for electrets with three wires. On two wire types, set the impedance with the bias resistor size. You can get more sensitivity by increasing the drain resistor, but you sacrifice high frequency response and dynamic range if you go too far with it. |
On Tue, 11 May 2004 19:49:18 +0100, Paul Burridge
wrote: HI Anyone know or care to guess what the typical impedance of a condenser mic is? --- Electret or straight RC? -- John Fields |
On Tue, 11 May 2004 19:49:18 +0100, Paul Burridge
wrote: HI Anyone know or care to guess what the typical impedance of a condenser mic is? --- Electret or straight RC? -- John Fields |
On Tue, 11 May 2004 14:28:31 -0500, John Fields
wrote: On Tue, 11 May 2004 19:49:18 +0100, Paul Burridge wrote: HI Anyone know or care to guess what the typical impedance of a condenser mic is? --- Electret or straight RC? Electret. Someone told me they're also now available with a SMD transistor amp built-on. Just a ball-park figure would suffice. -- "What is now proved was once only imagin'd." - William Blake, 1793. |
On Tue, 11 May 2004 14:28:31 -0500, John Fields
wrote: On Tue, 11 May 2004 19:49:18 +0100, Paul Burridge wrote: HI Anyone know or care to guess what the typical impedance of a condenser mic is? --- Electret or straight RC? Electret. Someone told me they're also now available with a SMD transistor amp built-on. Just a ball-park figure would suffice. -- "What is now proved was once only imagin'd." - William Blake, 1793. |
On Tue, 11 May 2004 23:40:32 +0100, Paul Burridge
wrote: On Tue, 11 May 2004 14:28:31 -0500, John Fields wrote: On Tue, 11 May 2004 19:49:18 +0100, Paul Burridge wrote: HI Anyone know or care to guess what the typical impedance of a condenser mic is? --- Electret or straight RC? Electret. Someone told me they're also now available with a SMD transistor amp built-on. Just a ball-park figure would suffice. --- Roughly the value of the load resistor, but take a look at this: http://www.hut.fi/Misc/Electronics/c..._powering.html -- John Fields |
On Tue, 11 May 2004 23:40:32 +0100, Paul Burridge
wrote: On Tue, 11 May 2004 14:28:31 -0500, John Fields wrote: On Tue, 11 May 2004 19:49:18 +0100, Paul Burridge wrote: HI Anyone know or care to guess what the typical impedance of a condenser mic is? --- Electret or straight RC? Electret. Someone told me they're also now available with a SMD transistor amp built-on. Just a ball-park figure would suffice. --- Roughly the value of the load resistor, but take a look at this: http://www.hut.fi/Misc/Electronics/c..._powering.html -- John Fields |
Paul Burridge wrote in message . ..
HI Anyone know or care to guess what the typical impedance of a condenser mic is? Generally within an order of magnitude of 1e12/s. Or did you mean an electret with built-in amplifier? Two wire, or three? ... Do a Google search for "electret microphone impedance." Cheers, Tom |
Paul Burridge wrote in message . ..
HI Anyone know or care to guess what the typical impedance of a condenser mic is? Generally within an order of magnitude of 1e12/s. Or did you mean an electret with built-in amplifier? Two wire, or three? ... Do a Google search for "electret microphone impedance." Cheers, Tom |
On 12 May 2004 06:25:09 GMT, "Walter Harley"
wrote: "Paul Burridge" wrote in message .. . Anyone know or care to guess what the typical impedance of a condenser mic is? Easiest way to answer that would be to go look at some manufacturer specs. I'll ignore the distinction between electret and condensor and going with common usage, and assume, without justification, that you are talking about the output impedance at the XLR connector of a balanced mic. In other words: you want to know what the output impedance of, say, a Shure SM87 or an Audio-Technica AT4033 is. Answer, based on a quick nonsystematic sample: about 100 ohms on average. But I'm not sure why you care. Like the rest of pro audio, they're not intended to be loaded by an equal impedance. Generally they want to see around 1k. As others have noted, this has nothing whatsoever to do with the impedance of the actual mic element, which is basically a capacitor with a fixed charge on it. Thanks, but I appreciate that, Walter. This is simply for simulation purposes. I just need to have a value to bung in the signal source box or the gain of this amp stage will not be meaningfully calculable. -- "What is now proved was once only imagin'd." - William Blake, 1793. |
On 12 May 2004 06:25:09 GMT, "Walter Harley"
wrote: "Paul Burridge" wrote in message .. . Anyone know or care to guess what the typical impedance of a condenser mic is? Easiest way to answer that would be to go look at some manufacturer specs. I'll ignore the distinction between electret and condensor and going with common usage, and assume, without justification, that you are talking about the output impedance at the XLR connector of a balanced mic. In other words: you want to know what the output impedance of, say, a Shure SM87 or an Audio-Technica AT4033 is. Answer, based on a quick nonsystematic sample: about 100 ohms on average. But I'm not sure why you care. Like the rest of pro audio, they're not intended to be loaded by an equal impedance. Generally they want to see around 1k. As others have noted, this has nothing whatsoever to do with the impedance of the actual mic element, which is basically a capacitor with a fixed charge on it. Thanks, but I appreciate that, Walter. This is simply for simulation purposes. I just need to have a value to bung in the signal source box or the gain of this amp stage will not be meaningfully calculable. -- "What is now proved was once only imagin'd." - William Blake, 1793. |
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