Hi everyone, I apologise if this is the wrong thread... my first post.
I'm looking for info about or schematic for B & K 2812 Power Supply/preamp.
This 4003 Pro Mike requires 130 Volt P/S.. Does anyone have the schematic for the B & K 2812 or a suitable power supply circuit they have used successfully.
Keen to make use of this mike.
Thanks in advance.
I'm looking for info about or schematic for B & K 2812 Power Supply/preamp.
This 4003 Pro Mike requires 130 Volt P/S.. Does anyone have the schematic for the B & K 2812 or a suitable power supply circuit they have used successfully.
Keen to make use of this mike.
Thanks in advance.
Just a few words regarding this mic, it does not have an internal tube preamp from my recollections. The 130 V is required for polarization of the condenser microphone (it's non-prepolarized). I believe there are a couple of fets or other transistors in the microphone as well. A suitable preamp such as Millenia HV-3C with the high voltage option would be something to look at.
Correction, the condenser on these particular mics are likely pre-polarized but still running the internal electronics on 130V. It doesn't use a lot of current though, 10 mA would probably be enough. If you were building a voltage multiplier for the P/S, I would keep it running at 40 KHz or more just to stay well away from the audio range.
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