DerEber
Well-known member
Hey guys,
I am having problems with an Condenser Mic recently.
It doesn't work on some 48V PS and give strange noise.
It works on all of my small mixers, but it shows problems on my main desk were some Neumann 24V->48V cards take care of the phantom power.
What I did was to meassure the Voltage on the Mic while plugged in.
The Voltage on the mic drops to 22V. I know it is normal to have a voltage drop due to the 2x6,8k resistors.
But I tested another working condenser and the Voltage drops only to 42V.
But of course it is a different circuit.
The circuit on my maybe "borken" mic looks somewhat like a simple 1 transistor km8x like thing.
So my question is now if such a voltage drop is reasonable for a circuit like this. If no, then maybe some tantal is gone bad and sucks all the amps.
The other possibility is that there is something wrong with my desk PS. As the mic is working on other mixers.
I just want to sure if my measurements look like a broken mic befor I start soldering.
None of the tantals measure 0 Ohm. But maybe they are just not yet completly gone.
best greeting,
Stephan
I am having problems with an Condenser Mic recently.
It doesn't work on some 48V PS and give strange noise.
It works on all of my small mixers, but it shows problems on my main desk were some Neumann 24V->48V cards take care of the phantom power.
What I did was to meassure the Voltage on the Mic while plugged in.
The Voltage on the mic drops to 22V. I know it is normal to have a voltage drop due to the 2x6,8k resistors.
But I tested another working condenser and the Voltage drops only to 42V.
But of course it is a different circuit.
The circuit on my maybe "borken" mic looks somewhat like a simple 1 transistor km8x like thing.
So my question is now if such a voltage drop is reasonable for a circuit like this. If no, then maybe some tantal is gone bad and sucks all the amps.
The other possibility is that there is something wrong with my desk PS. As the mic is working on other mixers.
I just want to sure if my measurements look like a broken mic befor I start soldering.
None of the tantals measure 0 Ohm. But maybe they are just not yet completly gone.
best greeting,
Stephan