Search found 3977 matches

by mediatechnology
Tue Nov 19, 2019 10:42 am
Forum: The Peabody Lounge
Topic: South Dakota Spends Nearly $500,000 On Anti-Meth Ad Campaign With Tagline "Meth. We're On It"
Replies: 0
Views: 11

South Dakota Spends Nearly $500,000 On Anti-Meth Ad Campaign With Tagline "Meth. We're On It"

South Dakota Spends Nearly $500,000 On Anti-Meth Ad Campaign With Tagline "Meth. We're On It" A video shows Governor Kristi Noem telling the camera, “I’m on meth,” before she explains that “on it” means “on the case of meth.” TV ads, posters, billboards and a website will feature the motto at a cos...
by mediatechnology
Mon Nov 18, 2019 10:02 am
Forum: The Peabody Lounge
Topic: They Walk Among Us
Replies: 22
Views: 1066

Re: They Walk Among Us

Meanwhile back across the pond we have this inquiry: "House Minority Leader Demands ABC Explain Why They Shelved Epstein Story" House Minority Leader Kevin McCarthy (R-CA) fired off a letter to ABC News President James Goldston demanding to know why the network shelved a story on Jeffrey Epstein aft...
by mediatechnology
Sun Nov 17, 2019 7:25 pm
Forum: The Peabody Lounge
Topic: They Walk Among Us
Replies: 22
Views: 1066

Re: They Walk Among Us

Prince Andrew's Epstein-Related BBC Interview Was "Catastrophic Mistake" Last night, televisions showed the perfectly state-managed scene of Prince Andrew, the Duke of York, sitting down BBC Newsnight’s Emily Maitlis conducting an interview recorded at Buckingham Palace this past Thursday. In it, a...
by mediatechnology
Sun Nov 17, 2019 4:10 pm
Forum: Build
Topic: Flat Balanced Input Moving Coil Phono Preamp Construction Information
Replies: 11
Views: 1700

Re: Flat Balanced Input Moving Coil Phono Preamp Construction Information

I just finished building a ZTX851 moving coil preamp board and thought I would post the noise spectra. https://proaudiodesignforum.com/images/jpg/MC_Preamp ZTX851_Noise_111719.jpg I haven't measured the actual gain - it usually runs just under 62 dB so we'll call it 61.5 dB. The PCM4222EVM A/D load...
by mediatechnology
Sun Nov 17, 2019 2:03 pm
Forum: Pro Audio Design
Topic: Low Noise Transistors: ZTX851 versus ZTX689B Noise Performance
Replies: 8
Views: 126

Re: Low Noise Transistors: ZTX851 versus ZTX689B Noise Performance

The trick is to punch through the emitter to reach the base at many places over the large transistor. That's what I'm seeing in the drawing - lot's of distributed base contacts. My rbb of 5.5Ω may be low, my last guestimate was 8Ω. I've asked Hans at diyaudio to run his sim for the MC preamp adjust...
by mediatechnology
Sun Nov 17, 2019 11:19 am
Forum: The Peabody Lounge
Topic: They Walk Among Us
Replies: 22
Views: 1066

Re: They Walk Among Us

Do not assume bad intent when the reason my just be bad judgement, or just different judgement.
I have to assume bad intent whenever anyone tells me that they want me dead.
They've clearly said that.
by mediatechnology
Sun Nov 17, 2019 9:29 am
Forum: Pro Audio Design
Topic: Low Noise Transistors: ZTX851 versus ZTX689B Noise Performance
Replies: 8
Views: 126

Re: Low Noise Transistors: ZTX851 versus ZTX689B Noise Performance

What in this geometry makes the transistor very low noise ? The Zetex explanation is too sketchy for me.
I don't know but I'll take the results.
by mediatechnology
Sun Nov 17, 2019 7:08 am
Forum: Pro Audio Design
Topic: Low Noise Transistors: ZTX851 versus ZTX689B Noise Performance
Replies: 8
Views: 126

Re: Low Noise Transistors: ZTX851 versus ZTX689B Noise Performance

The LM394 did use multiple transistors. About all I can find on Zetex technology is the "Matrix Geometry" used to provide low distributed base resistance to what appears to be a single transistor. Rather than many transistors we have many base contacts. https://proaudiodesignforum.com/images/jpg/Zet...
by mediatechnology
Sat Nov 16, 2019 4:05 pm
Forum: Pro Audio Design
Topic: Low Noise Transistors: ZTX851 versus ZTX689B Noise Performance
Replies: 8
Views: 126

Low Noise Transistors: ZTX851 versus ZTX689B Noise Performance

I used the MC preamp as a noise test circuit and temporarily installed a ZTX689 pair in one channel and a ZTX851 pair in the other for direct comparison. Rsource = 10Ω; Gain 62 dB (+/-0.5 dB); Rg = 1Ω; Ic 5.5 mA nominal https://proaudiodesignforum.com/images/jpg/MC_Preamp_ZTX689_v_ZTX851.jpg A nois...
by mediatechnology
Sat Nov 16, 2019 10:16 am
Forum: The Peabody Lounge
Topic: They Walk Among Us
Replies: 22
Views: 1066

Re: They Walk Among Us

Now more people are at risk of metabolic disease from over eating than starving. :lol: One of the many, many reasons I don't shop at Wal*Mart. It's difficult to look at the scooter people swollen from diets including high fructose corn syrup, hydrogenated oil and other toxins.* One of the common th...