Improving Audio Performance of Microphones Using a Novel Approach to Generating 48 Volt Phantom Powering

Kist J, Foley D. Improving Audio Performance of Microphones Using a Novel Approach to Generating 48 Volt Phantom Powering. In: AES Convention 145. Audio Engineering Society; 2018. Paper 10095. Available from: https://aes.org/publications/elibrary-page/?id=19821

@inproceedings{Kist2018_19821,
  author = {Kist, Joost and Foley, Dan},
  title = {{Improving Audio Performance of Microphones Using a Novel Approach to Generating 48 Volt Phantom Powering}},
  booktitle = {AES Convention 145},
  note = {Paper 10095},
  year = {2018},
  month = oct,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=19821}
}

TY  - CPAPER
TI  - Improving Audio Performance of Microphones Using a Novel Approach to Generating 48 Volt Phantom Powering
AU  - Kist, Joost
AU  - Foley, Dan
T2  - AES Convention 145
M1  - Paper 10095
PY  - 2018
DA  - 2018/10/06
UR  - https://aes.org/publications/elibrary-page/?id=19821
PB  - Audio Engineering Society
LA  - en
AB  - The introduction of the 48-volt phantom powering circuit in 1966 led to IEC 61938:1996. A key aspect of this powering circuit are the 6.81 k? precision resistors that are in parallel to the emitter-follower of the microphone preamplifier. These resistors act as a load on the emitter-follower that causes added distortion. A new approach is presented whereby, in series of these 6K8 resistors, an electronic circuit is placed that acts as a high input-impedance current source, which does not load the emitter-follower. By making this change, THD is decreased by 10 dB while also slightly improving the gain. Measurement results are presented comparing audio performance of a conventional 48-volt phantom power circuit and this new circuit along with circuit details.
ER  -