breakshift
Member
I've purchased what is apparently the worlds smallest electret condenser microphone - the Knowles FG series; FG-23629:
**broken link removed**
The datasheet says to bias it at 1.3V. My supply voltage is 5V and with a 100k bias resistor (i.e. between 5V and the mic +ve pin) it still sits at over 3V. Most other electret mics are biased with 1k to 10k ohm as they run higher than 1.3V. I know the FG series mic is different due to its size, but 100k seems a bit high. Is it best to increase the bias resistor or to use a voltage divider to deliver the 1.3V?
Mic max current draw is 50uA.
I've contacted Knowles for some more info (as the datasheet is very limited) but they're not responding.
For info this question is related to the following thread:
https://www.electro-tech-online.com/threads/lm386-instability-issue.139349/
**broken link removed**
The datasheet says to bias it at 1.3V. My supply voltage is 5V and with a 100k bias resistor (i.e. between 5V and the mic +ve pin) it still sits at over 3V. Most other electret mics are biased with 1k to 10k ohm as they run higher than 1.3V. I know the FG series mic is different due to its size, but 100k seems a bit high. Is it best to increase the bias resistor or to use a voltage divider to deliver the 1.3V?
Mic max current draw is 50uA.
I've contacted Knowles for some more info (as the datasheet is very limited) but they're not responding.
For info this question is related to the following thread:
https://www.electro-tech-online.com/threads/lm386-instability-issue.139349/