Search found 3158 matches

by mediatechnology
Fri Sep 21, 2018 8:02 am
Forum: The Peabody Lounge
Topic: Weather Channel Gaslighting Courtesy of IBM
Replies: 14
Views: 263

Re: Weather Channel Gaslighting Courtesy of IBM

That's why when I saw the original story I had to point it out. The media's "theater" at a time when actionable information is needed puts the burden back on us. Ham radio emergency networks and FRS radios are beginning to look better and better. (https://www.fcc.gov/wireless/bureau-divisions/mobili...
by mediatechnology
Fri Sep 21, 2018 7:52 am
Forum: Pro Audio Design
Topic: A Low Noise Balanced Input Moving Coil Preamp Using the ZTX851
Replies: 252
Views: 113881

Re: A Low Noise Balanced Input Moving Coil Preamp Using the ZTX851

Been awhile since I looked at MC gain for flat recording and 36 dB isn't enough to be useful anyway so I'm not sure I proposed a valid case.
by mediatechnology
Thu Sep 20, 2018 1:52 pm
Forum: Pro Audio Design
Topic: A Low Noise Balanced Input Moving Coil Preamp Using the ZTX851
Replies: 252
Views: 113881

Re: A Low Noise Balanced Input Moving Coil Preamp Using the ZTX851

For the DL103 with an output of 0,3mv@5mV/sec, S/N including the Cart becomes an excellent 75.0 dB. Good to know! I would just make Rg 20Ω for +36 dB as you did. You don't ever want to add external resistors to the line receiver inputs if you expect to maintain CMRR. The absolute values of the inte...
by mediatechnology
Thu Sep 20, 2018 6:42 am
Forum: The Peabody Lounge
Topic: Weather Channel Gaslighting Courtesy of IBM
Replies: 14
Views: 263

Re: Weather Channel Gaslighting Courtesy of IBM

I'm glad that you're high and dry. Apparently you have power too.

I went to the local paper website a few days ago and couldn't get a feel for the areas that weren't flooded.
by mediatechnology
Thu Sep 20, 2018 6:37 am
Forum: Pro Audio Design
Topic: A Low Noise Balanced Input Moving Coil Preamp Using the ZTX851
Replies: 252
Views: 113881

Re: A Low Noise Balanced Input Moving Coil Preamp Using the ZTX851

Thank you Hans. I appreciate the compliment. Its just pure luck for all of us that the ZTX851/951 can be used "off-label" as low-noise transistors. If I can just get the radiated/induced hum out by building a proper prototype... Also remembered one of my motivations in lowering collector current was...
by mediatechnology
Wed Sep 19, 2018 7:16 pm
Forum: The Peabody Lounge
Topic: Weather Channel Gaslighting Courtesy of IBM
Replies: 14
Views: 263

Re: Weather Channel Gaslighting Courtesy of IBM

I've been wanting to hear from Doug to see how he's doing.
That's been a worry of mine the last few days.
by mediatechnology
Wed Sep 19, 2018 7:09 pm
Forum: Pro Audio Design
Topic: A Low Noise Balanced Input Moving Coil Preamp Using the ZTX851
Replies: 252
Views: 113881

Re: A Low Noise Balanced Input Moving Coil Preamp Using the ZTX851

Thanks for the table Hans. Very informative and ties the data together. I like the OPA1642 they are a nice FET input similar to the OPA1612 otherwise. The 5.1 nV√Hz noise voltage seems high for that location though its respectable for a FET op amp. In MM preamps the OPA1612 is significantly noisier ...
by mediatechnology
Wed Sep 19, 2018 7:59 am
Forum: The Peabody Lounge
Topic: Weather Channel Gaslighting Courtesy of IBM
Replies: 14
Views: 263

Re: Weather Channel Gaslighting Courtesy of IBM

Image

Anderson Cooper waist deep.
Not Florence coverage but...

JR - If Hickory floods you might want to book CNN to come in and stand in your rain ditch.
by mediatechnology
Wed Sep 19, 2018 6:26 am
Forum: Pro Audio Design
Topic: A Low Noise Balanced Input Moving Coil Preamp Using the ZTX851
Replies: 252
Views: 113881

Re: A Low Noise Balanced Input Moving Coil Preamp Using the ZTX851

Thanks for doing the new sims Hans. How did rowing go? Here is the answer to your first question concerning the ZTX851, noise specified from 20Hz to 20 Khz: Rsource 1 Ohm/Rg 1 Ohm: Noise Free Transistor: 48.9 nV 2 ZTX851 : 49.1 nV 1 ZTX851 : 49.3 nV Rsource 1 Ohm/Rg 2 Ohm: Noise Free Transistor: 52....