Search found 4608 matches

by mediatechnology
Mon Nov 30, 2020 5:40 am
Forum: The Peabody Lounge
Topic: The Corona Virus Hoax of 2020
Replies: 305
Views: 25331

Re: The Corona Virus Hoax of 2020

So how do they know who has it? They use a PCR test. The PCR test does not work. Of the positives 90-97% are false. They cannot legitimately claim someone "has it" or doesn't to prove the effectiveness of a vaccine based on a flawed test. If one bases proof on flawed data the proof is flawed. Its is...
by mediatechnology
Sun Nov 29, 2020 9:19 pm
Forum: The Peabody Lounge
Topic: The Corona Virus Hoax of 2020
Replies: 305
Views: 25331

Re: The Corona Virus Hoax of 2020

I am not sure what you mean by Isolated and purified? Exactly that. Koch's Postulate #2: https://en.wikipedia.org/wiki/Koch%27s_postulates Never been done with SARS-Covid-2. No one has cultured the damn thing and apparently no one has even tried to. again unclear... a couple of the more effective r...
by mediatechnology
Sun Nov 29, 2020 11:56 am
Forum: The Peabody Lounge
Topic: The Corona Virus Hoax of 2020
Replies: 305
Views: 25331

Re: The Corona Virus Hoax of 2020

What is amazing to me is the fact that anyone would believe that a diagnostic, therapeutic or vaccine could be developed when the virus has NEVER been isolated and purified. NO ONE has done this. Therapeutics at least provide some scientific evidence of efficacy but we really don't know for what oth...
by mediatechnology
Sun Nov 29, 2020 6:42 am
Forum: The Peabody Lounge
Topic: The Corona Virus Hoax of 2020
Replies: 305
Views: 25331

Re: The Corona Virus Hoax of 2020

Suppressing alternate opinions only feeds the conspiracy inclined who already have trust issues.
Do you believe that world is responding to a "real" and very deadly virus?
by mediatechnology
Sat Nov 28, 2020 5:36 am
Forum: The Peabody Lounge
Topic: The Corona Virus Hoax of 2020
Replies: 305
Views: 25331

John Hopkins Study: A closer look at U.S. deaths due to COVID-19

John Hopkins Study: A closer look at U.S. deaths due to COVID-19 Cached copy: https://waynekirkwood.com/images/pdf/A_Closer_Look_At_US_Deaths_Due_To_COVID-19_The_Johns_Hopkins_News_Letter.pdf Retrieved from: https://web.archive.org/web/20201126163323/https://www.jhunewsletter.com/article/2020/11/a-...
by mediatechnology
Fri Nov 27, 2020 9:48 am
Forum: Pro Audio Design
Topic: Super Low Distortion Ultra Pure Audio Oscillators Revisited
Replies: 62
Views: 49548

Re: Super Low Distortion Ultra Pure Audio Oscillators Revisited

Here's the schematic of the notch filter I've been using borrowed from "Janasek."

Image
"Nacho" 1kHz Notch Filter

"Nacho's" insertion loss at 2 kHz is about -9dB; at 3 kHz the loss is about -5 dB.
by mediatechnology
Thu Nov 26, 2020 9:20 pm
Forum: Pro Audio Design
Topic: Super Low Distortion Ultra Pure Audio Oscillators Revisited
Replies: 62
Views: 49548

Re: Super Low Distortion Ultra Pure Audio Oscillators Revisited

The converter and output stage for a NCO/DDS is still the weak link. With all the hardware and advanced math shown in the ADI document to generate a sinewave the best performance they can come up with is only equal to a high quality Soundcard or outboard converter. The analog oscillator is so much b...
by mediatechnology
Thu Nov 26, 2020 8:53 pm
Forum: Pro Audio Design
Topic: variable gain amplifier using analog optoisolators
Replies: 5
Views: 95

Re: variable gain amplifier using analog optoisolators

The Tesla "Vactrols" are very interesting. I hope they come out with a VTL 5C3 replacement. I would keep going with your project though I'm not sure you'll find an CdS-based photocell to be fast enough for peak limiting. You might want to consider a hybrid approach using both an Opto and a FET. The ...
by mediatechnology
Thu Nov 26, 2020 11:49 am
Forum: Pro Audio Design
Topic: Super Low Distortion Ultra Pure Audio Oscillators Revisited
Replies: 62
Views: 49548

Re: Super Low Distortion Ultra Pure Audio Oscillators Revisited

I don't have a commerically-made DAC that can even come close to this low a level of THD. The THD and purity of this oscillator, or other analog solutions is at least an order of magnitude - maybe two orders of magnitude - better. It can be used to check A/D distortion and it's notch filter used to ...
by mediatechnology
Wed Nov 25, 2020 11:12 am
Forum: Pro Audio Design
Topic: Super Low Distortion Ultra Pure Audio Oscillators Revisited
Replies: 62
Views: 49548

Re: Super Low Distortion Ultra Pure Audio Oscillators Revisited

I still have some minor tweaking to do but the Ultra Low Distortion Oscillator looks pretty much like this: Oscillator schematic: https://proaudiodesignforum.com/images/png/ULDO_Ultra_Low_Distortion_Oscillator_Schematic_Cropped.png "ULDO" Ultra Low Distortion Oscillator Schematic Large format schem...