RuudNL
Well-known member
I have a problem with a Neumann TLM170 ("Circuit diagram 3")
When I apply phantom power, I hear a "whistle" and a lot of noise.
This sound disappears after a couple of seconds, that is: most of it.
What remains is a faint "beep" in the background.
The same situation occurs after switching the directional pattern.
I already checked the voltages coming from the DC/DC converter, but on the oscilloscope I do not see signs of a LF component.
Any ideas? It seems it is very hard to get the schematic diagram of the TLM170.
THIS is what it sounds like.
When I apply phantom power, I hear a "whistle" and a lot of noise.
This sound disappears after a couple of seconds, that is: most of it.
What remains is a faint "beep" in the background.
The same situation occurs after switching the directional pattern.
I already checked the voltages coming from the DC/DC converter, but on the oscilloscope I do not see signs of a LF component.
Any ideas? It seems it is very hard to get the schematic diagram of the TLM170.
THIS is what it sounds like.