Timeline for Electret microphone filtering
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 25, 2014 at 6:04 | comment | added | droseman | Of course... I should have seen that. Thanks for your help Andy | |
| Jul 25, 2014 at 6:02 | vote | accept | droseman | ||
| Jul 24, 2014 at 17:34 | comment | added | Andy aka | It divides the incoming voltage to the 22k resistors - it's called a potential divider. | |
| Jul 24, 2014 at 17:24 | comment | added | droseman | Reducing impedance increases attenuation? I thought it would be the other way round. Whats the theory behind that ? | |
| Jul 24, 2014 at 16:57 | comment | added | Andy aka | The 1k is needed for the attenuator to work - if the amplifiers input impedance were a reliable 1k then I'd say use that but, also consider that you may want to increase attenuation by a few dB and changing the 1k to something lower is twice as easy as changing 2 x 22k | |
| Jul 24, 2014 at 12:43 | comment | added | droseman | The attenuation is provided by the 22k series resistors? The codec is fitted with a digital attenuator, but I can see that this would make sense too. What might the 1k in parallel be for? | |
| Jul 24, 2014 at 9:17 | history | answered | Andy aka | CC BY-SA 3.0 |