Search found 4760 matches

by mediatechnology
Mon Aug 02, 2021 12:29 pm
Forum: Pro Audio Design
Topic: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator
Replies: 16
Views: 3924

Re: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator

Here's what the Studer 90 degree filter's phase response looks like using E96 roundings to Studer's original values.

Image
by mediatechnology
Mon Aug 02, 2021 11:48 am
Forum: Pro Audio Design
Topic: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator
Replies: 16
Views: 3924

Re: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator

Frank - Thanks for the values!
I'll try to run a phase plot on the original and modified values this afternoon.
by mediatechnology
Sat Jul 31, 2021 9:22 pm
Forum: Pro Audio Design
Topic: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator
Replies: 16
Views: 3924

Re: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator

Thanks for doing the calculations. What would be the Weaver values scaled similarly to my implementation? It looks like the GroupDIY simulation of the amplitude response shows the same anomaly around 5 kHz as your Studer calculations. I need to do a phase response plot. I've never used that tool in ...
by mediatechnology
Sat Jul 31, 2021 9:00 pm
Forum: The Peabody Lounge
Topic: The Corona Virus Hoax of 2020
Replies: 421
Views: 170729

CDC releases study showing 3/4 Delta cases are among the vaccinated

CDC releases study showing 3/4 Delta cases are among the vaccinated, says masks are the answer The CDC has released a study backing up its decision to recommend indoor masking for both vaccinated and unvaccinated Americans. The study examined one outbreak and found three-quarters of people testing ...
by mediatechnology
Sat Jul 31, 2021 1:44 pm
Forum: Pro Audio Design
Topic: Super Low Distortion Ultra Pure Audio Oscillators Revisited
Replies: 156
Views: 180129

Re: Super Low Distortion Ultra Pure Audio Oscillators Revisited

I just checked Atto's balanced attenuator error by reading directly in DC mV and then converting to dB. This time I had the build-out resistors included. The load was 597.5Ω. +10 +0.054 dB 0 (calibration point) -10 +0.03 dB -20 +0.052 dB -30 +0.084 dB -40 +0.12 dB -50 +0.157 dB -60 +0.257 dB -70 +0....
by mediatechnology
Sat Jul 31, 2021 10:40 am
Forum: Pro Audio Design
Topic: Super Low Distortion Ultra Pure Audio Oscillators Revisited
Replies: 156
Views: 180129

Re: Super Low Distortion Ultra Pure Audio Oscillators Revisited

Nice one Wayne, your attenuator board looks a lot better than mine :) I'll add the osc mods to my board when I am next down the workshop. I also added a switch to the notch filter input to put the osc in circuit. Twisted pair seem to work ok. Cheers Mike Thanks Fred. I'm intending to do the very sa...
by mediatechnology
Fri Jul 30, 2021 6:38 pm
Forum: Pro Audio Design
Topic: Super Low Distortion Ultra Pure Audio Oscillators Revisited
Replies: 156
Views: 180129

Re: Super Low Distortion Ultra Pure Audio Oscillators Revisited

Just got a new run of ULDO-Nacho boards in. https://proaudiodesignforum.com/images/jpg/ULDO_Nacho_20_PCB.jpg ULDO-Nacho Ultra Low Distortion Oscillator and Notch Filter PC Board The new boards have three improvements. A second "Generator Monitor" Phoenix connector was added to keep from having to m...
by mediatechnology
Fri Jul 30, 2021 5:12 pm
Forum: The Peabody Lounge
Topic: The Corona Virus Hoax of 2020
Replies: 421
Views: 170729

FDA Accidentally Shows List of Covid Vaccine Side Effects, Including Myocarditis, Autoimmune Disease & Death

Oops! FDA Accidentally Shows List of Covid Vaccine Side Effects, Including Myocarditis, Autoimmune Disease & Death An FDA slideshow presentation regarding Covid vaccines last year accidentally displayed a long list of possible adverse reactions to the vaccine, including myocarditis, seizures and ev...
by mediatechnology
Fri Jul 30, 2021 10:47 am
Forum: Pro Audio Design
Topic: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator
Replies: 16
Views: 3924

Re: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator

This is my interpretation of the Studer 90 Degree Dome Filter. Thanks Doug for the post and pointing this out to me back in 2018. https://proaudiodesignforum.com/images/jpg/Recorrelator_Stereo_To_Mono_Quadrature_Summing_Filter_073021.jpg "Recorrelator" Stereo to Mono Quadrature Summing Filter Based...
by mediatechnology
Wed Jul 28, 2021 5:04 pm
Forum: Pro Audio Design
Topic: Super Low Distortion Ultra Pure Audio Oscillators Revisited
Replies: 156
Views: 180129

Re: Super Low Distortion Ultra Pure Audio Oscillators Revisited

The Attenuator boards for ULDO-Nacho arrived: https://proaudiodesignforum.com/images/jpg/Atto_1_PCB_Assembled.jpg I used DC as a source and the DC dB capability of the Fluke 8050A meter to check attenuation accuracy prior to actually hooking it up to ULDO. The attenuator had ground floating making ...