Hi,
I have built a mic preamp circuit that does not like the small noise cancelling electret mics that I purchased from DigiKey----they have 680 ohms impedence.
The preamp works very well with some of the larger mics that I have but has very low volume with these mics.
I know enough to build various circuits but not enough to keep me out of trouble.
Here is the circuit that I used
https://freecircuitdiagram.com/2010/11/15/op-amp-microphone-pre-amp/
I added a 10K resistor after C1 before going to the mic with no luck.
Thanks in advance for any and all advice.
Harry
I have built a mic preamp circuit that does not like the small noise cancelling electret mics that I purchased from DigiKey----they have 680 ohms impedence.
The preamp works very well with some of the larger mics that I have but has very low volume with these mics.
I know enough to build various circuits but not enough to keep me out of trouble.
Here is the circuit that I used
https://freecircuitdiagram.com/2010/11/15/op-amp-microphone-pre-amp/
I added a 10K resistor after C1 before going to the mic with no luck.
Thanks in advance for any and all advice.
Harry