DIY BM800 Microphone MOD

In this Instructable, you will learn the basics of making your own microphone that will provide great audio at a lower price point than expensive microphones.

We have revised editions of these microphones and are selling them on our eBay store! Make sure to check them out!


1) K47 Capsule

2) Microphone body and grill

3) XLR Cable

4) Audio Interface

5) Small screwdrivers bits

6) Soldering Iron

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Step 1: Designing the Electrical System

Being amateur electronic enthusiasts we did not have the background to fully design our own microphone circuit. So we decided to acquire inspiration from:

an online blog that has a simple mic circuit that is easy to understand.

To design the schematic for our pcb we used a free online pcb editor that easily lets you order your pcb through the help of JLCPCB at a very low cost. Visit jlcpcb for cheap prototypes at

Step 2: Acquiring a Microphone Body

The most difficult and sometimes expensive part of making your own microphone is getting a body for it. Luckily for us, we had a cheap Chinese microphone that a company sent over for review so we decided to use it for this project. You can buy your own microphone body for a relative cheap price at a manufacturers website.

The original body had a blue color which we did not like so we decided to sand it. When sanding make sure to sand evenly and to not sand too much as it might create uneven surfaces and affect further painting.

Step 3: Replacing the Microphone Capsule

We decided to replace the previous capsule of this microphone with the K47 which would provide a good sound without sounding overly bright. We acquired this capsule from WGT center a capsule re-seller for a relative cheap price when compared to other alternatives.

When handling the capsule make sure to NOT touch the diaphragm at all. Always hold the capsule from the outer ring/outside. When installing make sure the ground lead is connected and do not tamper with the polarization lead at all. Always maintain the capsule in a dust free environment when working.

Step 4: Final Assembly and Testing

Make sure to fully secure the capsule to the stand and the grill to the body. Make sure to not strip any screws by excessively tightening them. Finally, screw in the end cap and connect it to your audio interface of choice and try it out! For audio testing and a visual tutorial on this microphone please check out our video linked here.

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    Question 7 weeks ago

    There is currently a second revision of this microphone in the works that will feature better circuitry as well as a better body. We were wondering if anyone would be interested in buying it if we were to put it up for sale?