[Design in progress] Varimu preamp

[Ashayar]

Hello everyone!

Yes, it take me a lot of time, too much passions, and a baby coming really soon
Here are the last schematics of my project.
The last changes I made was to add relays for the input pad, the phantom power etc, and a partition noise killer on each EF183.
Now I am searching for a solution to polarise both EF183 at the same current, I am searching some informations about how to design a variable current sink and I'll put one on each cathode of the EF183 to force them to work at the same point.

I thought about something else. Do you think it is worth it to make a full differential structure?
I am asking this because I saw on the G9 or the Redd47 that it was not differential, and If I decide to use the same idea, I could simplify my structure a lot

See you all!

François

 

[Ashayar]

Hello everyone,

I finally found some time, and I finished the first full iteration of my microphone preamp
Here we gooo!
I've got to check the resistors power handling, and to select the components, and then I'll be able to create the circuit board.

Have a nice day!

 

[Ricardus]

Hello everyone,

I finally found some time, and I finished the first full iteration of my microphone preamp
Here we gooo!
I've got to check the resistors power handling, and to select the components, and then I'll be able to create the circuit board.

Have a nice day!

Also, people around here like circuit boards. So if this turns out to be a really cool preamp I am sure people would buy boards from you.

 

[Ashayar]

Also, people around here like circuit boards. So if this turns out to be a really cool preamp I am sure people would buy boards from you.

Hello Ricardus,

If it's working well, every source for my version of the PCB will be shared

 

[Ricardus]

Hello Ricardus,

If it's working well, every source for my version of the PCB will be shared

Excellent! 

 

[Ricardus]

Ashayar,

Do you have a high resolution image of that schematic?

 

[Ashayar]

Hello Ricardus,

No, but I can share the Kicad project if you want

 

[Ricardus]

Hello Ricardus,

No, but I can share the Kicad project if you want

OK.

Also, I talked to your brother on the phone and he said it was OK to stop working on his guitar to finish this preamp!  ;D

 

[Ricardus]

Bump!