Sokel
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- Sep 8, 2021
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We have all seen lots of gear with noises of their own,right?
Like transformers,etc.
But have you ever heard a potentiometer singing?
I mean this thing has a low level vrrrr noise which is constant and does not change with rotating it.
To be more specific,nephew never listens to the uncle so he got an ali express pre,something like 100 euro,dirt cheap one,it doesn't even matter which one,there's gazillions of them.
So it has a definitely knock-off 4-gang,10k motorized Apls controlled by an opamp and a few other components (fun fact,it has 2 smd leds to do diode inside and each one lights up when it goes at each direction )
At first I could not define the source of the noise (we're talking really low in level) ,I suspected the trafo as usual but eventually I got it.
All the above is with nothing connected.
Crazy or what?
Edit: it also outputs a nice,robust 0.8-1.3V of DC offset as level goes up.

Like transformers,etc.
But have you ever heard a potentiometer singing?
I mean this thing has a low level vrrrr noise which is constant and does not change with rotating it.
To be more specific,nephew never listens to the uncle so he got an ali express pre,something like 100 euro,dirt cheap one,it doesn't even matter which one,there's gazillions of them.
So it has a definitely knock-off 4-gang,10k motorized Apls controlled by an opamp and a few other components (fun fact,it has 2 smd leds to do diode inside and each one lights up when it goes at each direction )
At first I could not define the source of the noise (we're talking really low in level) ,I suspected the trafo as usual but eventually I got it.
All the above is with nothing connected.
Crazy or what?
Edit: it also outputs a nice,robust 0.8-1.3V of DC offset as level goes up.

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