| 摘要 |
The DC magnetization of a transformer core is prevented without increasing the size of an output transformer in a condenser microphone which is operated by a phantom power source, uses a vacuum tube as an impedance converter, and outputs a vacuum tube signal via the output transformer. The condenser microphone includes a condenser microphone capsule MC, a vacuum tube V01 used as an impedance converter, and an output transformer TRS having a primary winding F connected to the plate and screen grid of the vacuum tube V01 and a secondary winding S connected to the phantom power source via an output connector, wherein the primary winding F has a center tap CF and both ends of the secondary winding S are connected to the center tap CF via constant current diodes D04 and D05, respectively.
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