I have a somewhat weird question (hopefully not too weird).
I work with an audio system. It includes a wave generator, a (33500B series Keysight) wave generator, an amplifier (2003 op-amp based circuit, will be replaced with LM1875 circuit in the future) and a speaker (H1283 Seas Prestige). I use BNC cables between the system components.
Here is my problem, I have background noises (even when the generator is on but not outputting any sounds).
I noticed, that the best thing to reduce this noise is me touching one of the system components (not speaker but wave generator, audio amplifier or the metal ends of the cables).
I am not sure why is it so. Is it because I am a huge capacitor?
Anyway, here is my question: (Since I can not hold the boxes while applying the experiments...):
What is the simplest action I can apply in order to create a similar effect to me touching the system components?
I already tried:
- Attaching a metal mesh (to create a "Faraday cage" effect).
- Attaching parts of the metal mesh to components of the audio box.
- Connecting the boxes to an external ground.
- Connecting the grounds of all the boxes.
All these things helps a little. But nothing has the effect of me touching the boxes.