Greetings to all.
In my mic preamplifier, I decided to make a 6.3 V AC.
There is a significant low-frequency hum in the sound.
I tried to fix it in different ways - 3.15v - 0 - 3.15v, resistors 100 ohms (artificial mean point).
This only partially removes the rumble, but it still remains.
Next I tried to ground the 6.3V capacitors and the rumble completely disappeared ...
I have a question, is there something wrong with this method (for example, the hum was gone and the noise increased)?
In my mic preamplifier, I decided to make a 6.3 V AC.
There is a significant low-frequency hum in the sound.
I tried to fix it in different ways - 3.15v - 0 - 3.15v, resistors 100 ohms (artificial mean point).
This only partially removes the rumble, but it still remains.
Next I tried to ground the 6.3V capacitors and the rumble completely disappeared ...
I have a question, is there something wrong with this method (for example, the hum was gone and the noise increased)?