Search found 3585 matches

by JR.
Fri Jan 15, 2021 10:57 am
Forum: The Peabody Lounge
Topic: beverly hillbilly storm windows and cybernetic heat control
Replies: 25
Views: 23154

Re: beverly hillbilly storm windows and cybernetic heat control

I just got my latest electrical bill nudge this time saying I used 4% less electricity than my efficient neighbors. This doesn't reflect my recent changes just finished. My new strategy is to shut off my 600W of auxiliary heaters and rely on just the single 250W baseboard heater and blower, to bring...
by JR.
Thu Jan 14, 2021 6:27 pm
Forum: The Peabody Lounge
Topic: Entropy
Replies: 1190
Views: 463490

Re: Entropy

Going back to the old trap post... I often bleach my traps and also run a lot of boiling hot water through them. Then lots of hot water-heated water. It takes 2-3 feet/sec flow rate for a pipe to self-clean. Bleach isn't so great for metal traps but mine are all PVC now. connecting another dot or t...
by JR.
Thu Jan 14, 2021 1:03 pm
Forum: The Peabody Lounge
Topic: Entropy
Replies: 1190
Views: 463490

Re: Entropy

Today's entropy episode involves my smart battery charger... today after returning from my once a week shopping trip that is inadequate to keep my car battery topped off, I connected my smart charger (plugs into the cigarette lighter).With no charging... I first checked the obvious suspects and char...
by JR.
Wed Jan 13, 2021 9:41 am
Forum: Pro Audio Design
Topic: Super Low Distortion Ultra Pure Audio Oscillators Revisited
Replies: 100
Views: 55306

Re: Super Low Distortion Ultra Pure Audio Oscillators Revisited

yup stick a fork in it, and back off to only +18dBu

JR
by JR.
Tue Jan 12, 2021 4:06 pm
Forum: The Peabody Lounge
Topic: Entropy
Replies: 1190
Views: 463490

Re: Entropy

For another head scratcher, I had been getting smelly water from that bathroom sink for a long time and I looked into the obvious suspects, like too low hot water heat settings, so I cranked up the hot water heater hotter than normal. After the old T&P relief valve started leaking I turned down the ...
by JR.
Tue Jan 12, 2021 1:42 pm
Forum: The Peabody Lounge
Topic: beverly hillbilly storm windows and cybernetic heat control
Replies: 25
Views: 23154

Re: beverly hillbilly storm windows and cybernetic heat control

I just finished what I expect is my final "improvement" to my bedroom temperature management. I now have three baseboard heaters... The smallest one (250W) with just enough draw to keep the smart thermostat happy is always connected to the smart thermo output along with the blower fan. This gives mo...
by JR.
Mon Jan 11, 2021 10:26 pm
Forum: Document
Topic: Zener Diode Table
Replies: 3
Views: 68

Re: Zener Diode Table

rip

JR
by JR.
Mon Jan 11, 2021 10:48 am
Forum: Document
Topic: Zener Diode Table
Replies: 3
Views: 68

Re: Zener Diode Table

and still no 48V zener... of course two 24V zeners will still work.

JR
by JR.
Sun Jan 10, 2021 10:20 pm
Forum: Pro Audio Design
Topic: Super Low Distortion Ultra Pure Audio Oscillators Revisited
Replies: 100
Views: 55306

Re: Super Low Distortion Ultra Pure Audio Oscillators Revisited

With the ULDO at the input of the DUT, the Focusrite at the output, you get the FFT then calculate the THD+N. This should give an extremely accurate measurement at 1KHz. Only to a point. The Focusrite's A/D has a residual THD of around 0.0002% (https://proaudiodesignforum.com/forum/php/viewtopic.ph...
by JR.
Sat Jan 09, 2021 1:42 pm
Forum: Pro Audio Design
Topic: Super Low Distortion Ultra Pure Audio Oscillators Revisited
Replies: 100
Views: 55306

Re: Super Low Distortion Ultra Pure Audio Oscillators Revisited

Nice... I notice that several parts in there were not available back decades ago. I'm guessing that there is quadrature (90') between the two integrators. I scribbled some after beer o'clock over the years trying to make a ripple-free rectifier, using the trig identity sin^2+cos^2=1.... I discussed ...