Help with building a pre amp for my selfbuild Microphone

[LiTiG]

Hello!
A couple of weeks ago I decided to build my own microphone to use for Discord and Streaming etc. There is a Youtube Video by DIYperks in which he goes through the full process. So far I managed to order and take care of most of the things myself. As note I don't have much know how about electronic Engineering or circuit layouts etc.

Now my problem is the following: I need 3 types of resistors for the pre amp. Searching for those showed me really fast the amount of choices I have to make. My first question is now how do I know which one would to its job and which is a risk for the circuit. (I will leave links and files down below to make it more clear)

While asking the same question on reddit, a member said that there is a flaw in the layout design which could cause problems later on. Me again having not the knowledge doesn't know what to do now. Should I use the existing layout or somehow make a new one?

I would really appreciate help since I love working on this project and really want to finish it to my satisfaction and of course show some results!

YT Video:

Google drive link to the files and Layout used in the Video: https://drive.google.com/drive/folders/1jQY1SycV0OChw9_9w9qhMVCW47YFHgBu

Reddit post: https://www.reddit.com/r/AskElectro...ight_resistors_for_my_self/hlm6cun/?context=3

Suggestion from member: http://www.falstad.com/circuit/circ...TUbRHGVmxMAQApKBfocIngOJVE0QgHGQNCjH0d+SnXEAA

 

[Nanren888]

The resistors in your schematic have values, 6M, 500 Ohm, 4.5k Ohm & 12K Ohm.
Can you be more specific on the problem you have selecting resistors?
.
The referenced comment about a flaw: If that's the lack of bias on the FET, it's a point and depends on what hat microphone looks like.

 

[LiTiG]

the upper layout is the suggested one and the lower one is the one used in Video and schematic. I mean which values I need I know but I saw there is also tolerances etc. and that's what throws me of. Could you explain FET more?

Like I said, sadly I don't have much Knowledge about all of that. I would so far just blindly follow the videos description and hope for the best but the Reddit comment made me worried about it not working after all.

 

[Audioguru]

Anybody can post a video of a circuit on You Tube then many of the video circuits have serious design errors.
Of course the added Jfet needed a gate resistor to ground.

The circuit will not work because it is completely wrong for both mic cartridges shown:
1) The 100S cartridge shown in the video is a Condensor mic that needs a high voltage on it. The circuit powers it with 0V.
2) The JLI2555 cartridge shown on the schematic is an electret mic that already has a Jfet inside it that must be powered. The circuit powers it with 0V and the added Jfet is not needed.

 

[LiTiG]

Okay that sounds like I need to change some things. Do you buy any chance know what I now need to do?

 

[Audioguru]

You need to buy a mic and a preamp that is matched to it.

 

[GrahamComp]

Hello!
A couple of weeks ago I decided to build my own microphone to use for Discord and Streaming etc. There is a Youtube Video by DIYperks in which he goes through the full process. So far I managed to order and take care of most of the things myself. As note I don't have much know how about electronic Engineering or circuit layouts etc.

Now my problem is the following: I need 3 types of resistors for the pre amp. Searching for those showed me really fast the amount of choices I have to make. My first question is now how do I know which one would to its job and which is a risk for the circuit. (I will leave links and files down below to make it more clear)

While asking the same question on reddit, a member said that there is a flaw in the layout design which could cause problems later on. Me again having not the knowledge doesn't know what to do now. Should I use the existing layout or somehow make a new one?

I would really appreciate help since I love working on this project and really want to finish it to my satisfaction and of course show some results!

YT Video:

Google drive link to the files and Layout used in the Video: https://drive.google.com/drive/folders/1jQY1SycV0OChw9_9w9qhMVCW47YFHgBu

Chegg Discord Server:
https://discordserverlists.com/chegg-discord/

Reddit post: https://www.reddit.com/r/AskElectro...ight_resistors_for_my_self/hlm6cun/?context=3

Suggestion from member: http://www.falstad.com/circuit/circ...TUbRHGVmxMAQApKBfocIngOJVE0QgHGQNCjH0d+SnXEAA

How is this going if you are still working on this?