This is no lamp headset. It's a machine of some extinct civilisation, located on a forbidden planet. I would say, this is unobtainium by now...
Headset with light 😛
An externally hosted image should be here but it was not working when we last tested it.
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by the way the :cool button for Nelson has disappeared again……and the replacement show its blue pale face,
look at my signature, instead of the red one you see the pale blue one…..
Nelson do you feel well….?
😀
look at my signature, instead of the red one you see the pale blue one…..
Nelson do you feel well….?
😀
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LuminAria @10ppm
So I tidied up and twisted the cables, grounded the board and the 50Hz lowered to around -87dB, still a bit high I think. After more troubleshooting, I realized the unshielded QA400 cable actually pickup a -104dB signal from the environment (even when LuminAria is off) which are then amplified by 17dB by the LuminAria and hence the -87dB, so I assume it's OK for now, unless I can hear some real hum later.
Then I tried to search the sweetspot, and easily lowered the THD to 10ppm @1Vrms 😀 (B+: 114V, Vds: 80V, Id: 73mA, Rd: 600R). First picture is the QA400 measurement after the optimization, second one showing the initial hum, and third one the test setup after tidying the cables.
Time to solder the production channel boards, and thanks Michael for this nice design 🙂.
So I tidied up and twisted the cables, grounded the board and the 50Hz lowered to around -87dB, still a bit high I think. After more troubleshooting, I realized the unshielded QA400 cable actually pickup a -104dB signal from the environment (even when LuminAria is off) which are then amplified by 17dB by the LuminAria and hence the -87dB, so I assume it's OK for now, unless I can hear some real hum later.
Then I tried to search the sweetspot, and easily lowered the THD to 10ppm @1Vrms 😀 (B+: 114V, Vds: 80V, Id: 73mA, Rd: 600R). First picture is the QA400 measurement after the optimization, second one showing the initial hum, and third one the test setup after tidying the cables.
Time to solder the production channel boards, and thanks Michael for this nice design 🙂.
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On a not so audio-related note:
My team finished our 100-mile relay this past weekend. I had a 16-mile night leg through the woods. The logistics and prep took a lot of time, so if you sent me an email in the past couple of weeks and I haven't replied, send it again. 🙂
"Burning River" is done, now I can get ready for "Burning Amp"!
My team finished our 100-mile relay this past weekend. I had a 16-mile night leg through the woods. The logistics and prep took a lot of time, so if you sent me an email in the past couple of weeks and I haven't replied, send it again. 🙂
"Burning River" is done, now I can get ready for "Burning Amp"!
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Power 
Congratulations
What about some teaser that tells us about your design for "Burning Amp"
Tim, I wish there was a teaser. Right now, they're just ideas floating around in space 🙂
I hope I can get something done in time. But, time has a way of going much faster than I plan,
I hope I can get something done in time. But, time has a way of going much faster than I plan,
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