Ultra high precision digital control attenuator

[BV]

Do the pretty pitures somehow indicate "goodness"? I bet a $2 pot has less distortion and noise. In what way was the multiplying dac better? Distortion?

Those pictures are very close to perceived quality, verified by tests, believe me.. $2 pot is much worse in channel tracking, crosstalk (and wit usual values as 10-50kohm also in noise).Distortion is dependent on active devices, similar for both solutions.Multiplaying DAC was better in distortion at high levels (above3-5V RMS) an frequencies around 20kHz. IMD 19+20 was better, too.

 

[bbp]

Do the pretty pitures somehow indicate "goodness"? I bet a $2 pot has less distortion and noise. In what way was the multiplying dac better? Distortion? It obviously uses some very dubious resistors.

PASSIVE ATTENUATOR is bad in ultra-low level condition, balance for L&R,noise sensitve etc

the passive potentiometer even can be configurate a LOW-PASS FILTER with the Capacitor in the output

http://www.diyaudio.com/forums/atta...ion-volume-module-like-mark-levinsions-p1.jpg

picture for the system

 

[bbp]

I just got the AP measurement from my friend

the module reaches a ultra-high performance in ultra-low level conditions

FFT @ -80dBV 1KHz
we can see the noise floor is below 1uV with balance output

 

[wojtekr]

Could You show the schematic of dg411 application?

 

[bbp]

Could You show the schematic of dg411 application?

Hi wojtekr

dgxxx (I use DG413DY in my applications) can be configurate as SPST switch, with these switches, we can made the following topology, which was used in my applications

 

[tiefbassuebertr]

Hi wojtekr

dgxxx (I use DG413DY in my applications) can be configurate as SPST switch, with these switches, we can made the following topology, which was used in my applications

is this approach in the meantime available as kit ?