On Thu, Feb 13, 2025 at 02:37 AM, Goran Finnberg wrote:
Is this really the original schematic or a fake copy.
Unknown. This is one I found from multiple net sources, but the origin was not stated.?
However, the circuit seemed suspicious, which led to my question. The FET info makes better sense now, yet the design purpose is only inferred. I am trying to solve a practical problem here...
For example:?
?
- Given a dynamic (moving coil) microphone like the Shure SM58,
- To be used with a Ham Radio like the Yaesu 900,
- The radio includes some signal processing/compression for the mic input,
- 48V Phantom power in not supplied per se, but 5VDC is available on the mic connector,
- The radio assumes a balanced mic input and has a 600ohms Zin,
- The SM58 has a Zout of 300ohms,
- According to the SM58 wiring diagram, the mic cartridge uses a transformer interface to the XLR connector.
- So, is a preamp needed in such an application and, if so, what kind of preamp?
Any help here is appreciated.
TIA,
Dan?
