Low noise Mini Electret Microphone PreAmplifier
- Rajkumar Sharma
-
29367Views
- easy
- Tested
The single supply microphone pre-amplifier amplifies the output signal of an electret capsule microphone to audio line levels. An op amp is used as a trans-impedance amplifier to convert the output current from the microphone in to a signal level voltage. The circuit works with 9V so it is good choice for battery operated systems.
Features
- Supply 9V DC
- Current Approx. 3mA
- On Board Microphone
- Very thin and narrow PCB
Schematic
Parts List
Photos
Video
OPA172 Datasheet
opa172PCB
Comments
Thank you for this. Modified it to run on a 5V supply and using another OP-Amp and it works perfectly with those alterations.
2 years agoCould you let us know what modifications you have done to this circuit and why?
2 years agothe capacitor C5 is well polarized in the diagram, or is it a misprint
5 days agoThanks for noticing this fault. We fixed it above in schematic
3 days ago