Search found 5185 matches

by mediatechnology
Tue Mar 28, 2023 3:57 pm
Forum: Pro Audio Design
Topic: New: A Direct-Coupled Input-Capacitorless Active Mic Preamp
Replies: 123
Views: 269972

Re: New: A Direct-Coupled Input-Capacitorless Active Mic Preamp

I decided to revisit the argument I've previously made regarding the 1/f noise effects of having input coupling capacitors versus direct-coupling of mic preamp inputs. I decided to use the Flat Moving Coil Preamp since its a finished circuit board. The input noise voltage is exceptionally low, at a...
by mediatechnology
Tue Mar 28, 2023 1:54 pm
Forum: The Peabody Lounge
Topic: The Corona Virus Hoax of 2020 = 2023 "Vaccine" Injury And Depopulation
Replies: 588
Views: 275974

Bombshell Vax Analysis Finds $147 Billion In Economic Damage, Tens Of Millions Injured Or Disabled

Bombshell Vax Analysis Finds $147 Billion In Economic Damage, Tens Of Millions Injured Or Disabled A new report estimates that 26.6 million people were injured, 1.36 million disabled, and 300,000 excess deaths can be attributed to COVID-19 vaccine damages in 2022 alone, which cost the economy nearl...
by mediatechnology
Sun Mar 26, 2023 4:57 pm
Forum: The Peabody Lounge
Topic: The Corona Virus Hoax of 2020 = 2023 "Vaccine" Injury And Depopulation
Replies: 588
Views: 275974

Article: SARS-CoV-2 requires acidic pH to infect cells

SARS-CoV-2 requires acidic pH to infect cells Interesting article: "SARS-CoV-2 requires acidic pH to infect cells" (pdf): https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9499588/pdf/pnas.202209514.pdf Abstract Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) cell entry starts wit...
by mediatechnology
Mon Mar 20, 2023 4:27 pm
Forum: Pro Audio Design
Topic: The Studer "90°" Dome Filter Stereo to Mono Quadrature Summer
Replies: 35
Views: 17812

Re: The Studer "90°" Dome Filter Stereo to Mono Quadrature Summer

More sound files. Davie Allan and The Arrows "Shape of Things to Come" originally recorded in LCR. Sequence is Stereo, L+R then I+Q. https://proaudiodesignforum.com/content/Quadrature_Summing_Filter_Davie_Allan_Shape_Of_Things_Demo.wav https://proaudiodesignforum.com/images/jpg/Quadrature_...
by mediatechnology
Mon Mar 20, 2023 2:07 pm
Forum: Pro Audio Design
Topic: The Studer "90°" Dome Filter Stereo to Mono Quadrature Summer
Replies: 35
Views: 17812

Re: The Studer "90°" Dome Filter Stereo to Mono Quadrature Summer

While I'm waiting on Quadrature Summing Filter boards to be delivered I fired up the Protoboard to make some sample files. Some time ago I downloaded a problematic synth sample from Gearspace that was posted in this thread: https://gearspace.com/board/so-much-gear-so-little-time/1137281-mix-element...
by mediatechnology
Sun Mar 19, 2023 9:57 am
Forum: Pro Audio Design
Topic: The Studer "90°" Dome Filter Stereo to Mono Quadrature Summer
Replies: 35
Views: 17812

Re: The Studer "90°" Dome Filter Stereo to Mono Quadrature Summer

Quadrature Summing Filter boards are on order and should be available in about 7-10 days.
I'll be building one to check the layout as soon as they arrive.
The BOM for parts excluding PC board looks to be about $101 US.
by mediatechnology
Fri Mar 17, 2023 4:11 pm
Forum: Pro Audio Design
Topic: The Studer "90°" Dome Filter Stereo to Mono Quadrature Summer
Replies: 35
Views: 17812

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

This is the current schematic for the "Quadrature Summing FIlter" layout. I decided to eliminate the ability to route the separate I and Q components to the final outputs to save a relay and board space. This mode would not be used in most applications. I and Q now come up on a header whe...
by mediatechnology
Wed Mar 15, 2023 5:26 pm
Forum: Pro Audio Design
Topic: The Studer "90°" Dome Filter Stereo to Mono Quadrature Summer
Replies: 35
Views: 17812

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

Putting the final touches on the "Quadrature Summing Filter" board. https://ka-electronics.com/images/jpg/Quadrature_Summing_Filter_PCB_Layout.JPG I eliminated the relay which forwarded I and Q as "stereo" to the final output. That would almost never be used except for people wa...