MB Electronic MB C527

[ubxf]

I just got one of these mics and before I can tell if it works I have a couple of hurdles. It is powered by 2 15V batteries and the connector is a smaller version of an xlr Tuchel ? would it be ok to use 2 small 12V 27A and some small probes for testing ? What might be the pin out , is it 1 ground 2 hot and 3 neutral ? There is one tiny screw on the body and I was hoping to slide out the electronic but it didn't move. Any suggestions on disassembly.

 

[Khron]

would it be ok to use 2 small 12V 27A and some small probes for testing ?

I'd very much rather lean towards a current-limited adjustable (lab) supply, just to be on the safe side.

What might be the pin out , is it 1 ground 2 hot and 3 neutral ?

Let's not mix mains wiring nomenclature ("neutral") with audio, shall we?

http://groupdiy.dk/index.php?topic=1444.0

First diagram in that first photo is the small Tuchel (middle is big Tuchel, right is XLR).

 

[ubxf]

Thank you so much, so 2 is ground.How could I use a lab supply to feed the voltage inside the mic ?

 

[rock soderstrom]

Thank you so much, so 2 is ground.How could I use a lab supply to feed the voltage inside the mic ?

I would do it this way for basic testing and turn the current limiter almost all the way down.

 

[rock soderstrom]

There is one tiny screw on the body and I was hoping to slide out the electronic but it didn't move. Any suggestions on disassembly.

I don't know the mic exactly, but is it perhaps one of the screws that you have to screw in slightly so that you can pull off the outer cover?

 

[RuudNL]

I have some information about the C-540, that also uses two 15V. batteries.
Maybe there are some similarities.

 

[ubxf]

I would do it this way for basic testing and turn the current limiter almost all the way down.

View attachment 140782

Thank you that would be great but that barrel goes back into the mic and there isn't even a mm gap and it needs to be pushed up tight because the contact is at the top. That's why I thought of using my 12V batteries , but I didn't think of the current limiter.
Maybe I can drill a hole in the base Tuchel to pass a couple of tiny wires

 

[ubxf]

I have some information about the C-540, that also uses two 15V. batteries.
Maybe there are some similarities.

Thank you, they are similar but mine has a non removable capsule from the outside so I'm hesitant to push it to remove the circuit.

 

[rock soderstrom]

but I didn't think of the current limiter.

...but this is also just a safety feature, if you don't make any mistakes , you don't need it. I would try it with the two 12V batteries to see if the micro basically works...as long as you don't have the right batteries or a better solution. How about converting to phantom power? Surely someone has already done that. To do this, you must of course be able to open the micro completely so that you can access the electronics. I get it.

 

[ubxf]

...but this is also just a safety feature, if you don't make any mistakes , you don't need it. I would try it with the two 12V batteries to see if the micro basically works...as long as you don't have the right batteries or a better solution. How about converting to phantom power? Surely someone has already done that.

That was my initial thought, but since I can't seem to manage opening it that's a little difficult . The current limiter might be necessary in case of bad capacitor to avoid destroying the FET ? I saw quite a few people convert the C520 and C540 and assumed this would be the same. Not really the case so far .

 

[rock soderstrom]

I googled around a bit and there really isn't much on the subject. There must be a way to open it, right? Got better photos?

 

[ubxf]

Yes, the little screw when lowered should let the pcb slide out. what I see as a possibility is to apply gentle force on the side of the capsule to push everything out . On other mics (km84 or 451) you can pull the pins of the xlr or if you can unscrew the capsule you can push the top.