Low noise Mini Electret Microphone PreAmplifier
- Rajkumar Sharma
-
34776Views
- 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
opa172
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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
7 months agoThanks for noticing this fault. We fixed it above in schematic
7 months agoI want to purchase the above microphone preamp. What is the cost in USD and how do I get it?
5 months agoThanks for your interest in this board. Please check your email for more details.
5 months agoHi! Is it possible to hear some real sound tests? is it possible to get a copy of this mounted for experimental purposes? thanks and good job!! 🙂
4 months agoI am sorry, all i have for now is the video above, and we don’t have a sample on hand, but we can produce the board in quantity if you are interested.
4 months agoHi,
3 months agoI’m interested in several of these — more if they perform well.
How is performance in the presence of RF interference & nearby electrical devices? The PC board is pretty basic — does it require shielding?
I am interested in either the PC board or assembled device, depending on price. Thanks!
Could you email me through the form here: https://www.electronics-lab.com/contact-us/ and I will contact you with a quote.
3 months agoHi!
3 months agoHow much for an assembled device?
For now I’m in a prototyping face and i would like to try one of these out.
Sorry, these will have to be produced on order, so our minimum is 10 boards. Will this work for you?
3 months ago