The speed of light can change. The maximum speed of light is the only constant, so, no that isn't true.
Beats me. I usually just curse badly built connectors. At work it's impedance matched cables or the ones that come with the kit. I'm lucky enough not to have to worry much past a colleague asking what form of USB cable this really is. 🙂
I thought we were talking about how fast an electrical signal travels along a transmission line? However, I never quite know what Simon is asking in his little puzzles because he often seems to set us an ill-posed question which has no self-consistent answer.scott wurcer said:
I hope he is not that confused, but I suppose it is possible.
My first "product" in the diyAudio store! It's a nice feeling
Folks,
The Store has just added a new offering to their line of bare PCB products. It's called M2X which is the First Watt / Nelson Pass "M2" class A amplifier, crossed with ("X") five different input stages. My little contribution was to design the four new input stages, and to put them on interchangeable, field-swappable daughter cards. The fifth input stage is Nelson's original, using out-of-production Toshiba K170/J74 JFETs.
The amp itself is quite a pure example of Nelson Pass's unique style: it's 100% class A, with output stage current tightly controlled by Nelson's "optical bias" (optocoupler) circuit. There's no feedback, there IS an AC coupling capacitor, the output stage is a pair of MOSFETs, and the original input stage is a pair of JFETs. The second stage ("VAS" in some books) is a transformer, whose secondary is wired in series with the primary, which connection is called an auto-transformer. The amp is built on lavishly enormous heatsinks, which are included as part of a complete chassis kit, also sold at the diyAudio store.
If you're interested, there's more information at this link. The sales page contains further links to the schematics, BOM, user's manual, etc.
Thanks for reading,
Folks,
The Store has just added a new offering to their line of bare PCB products. It's called M2X which is the First Watt / Nelson Pass "M2" class A amplifier, crossed with ("X") five different input stages. My little contribution was to design the four new input stages, and to put them on interchangeable, field-swappable daughter cards. The fifth input stage is Nelson's original, using out-of-production Toshiba K170/J74 JFETs.
The amp itself is quite a pure example of Nelson Pass's unique style: it's 100% class A, with output stage current tightly controlled by Nelson's "optical bias" (optocoupler) circuit. There's no feedback, there IS an AC coupling capacitor, the output stage is a pair of MOSFETs, and the original input stage is a pair of JFETs. The second stage ("VAS" in some books) is a transformer, whose secondary is wired in series with the primary, which connection is called an auto-transformer. The amp is built on lavishly enormous heatsinks, which are included as part of a complete chassis kit, also sold at the diyAudio store.
*link to 31 year old "optical bias" circuit: (here)
Neither NP nor I receive a dime of the revenue from M2X, and I doubt the Store itself is making a fabulous profit when selling twelve PCBs for USD 29.00. But DIYers and hobbyists and music lovers get a damn nice amplifier (IMHO) for a damn good price, thanks to the Store.If you're interested, there's more information at this link. The sales page contains further links to the schematics, BOM, user's manual, etc.
Thanks for reading,
Mark Johnson
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And just in time for heating purposes for the northern hemisphere crowd to boot. 🙂 And yes, it's hard to see how this whole offering is done not at a loss. Kudos on the design/layout, Mark.
From yesterday if we look at the current in just 1 millimeter of the cable at any given instant about two charges should be passing through. If the copper cable is very thin that bit of copper would have about 1e22 copper atoms with 29 each electrons carrying a negative charge.
Now the Bohr's or planetary model of the atom seems be be many folks image, but it seems it really is more like a fog of electrons surround the nucleous. If one of our moving charges adds to an atom's charge that forces one out to do the same on down the line. For a charge to transit the distance takes under 50 picoseconds.
So even if our charge does not take the shortest possible path there is going to be an extremely small difference in the end result.
Again no excess charge stays and there must be a complete circuit to get the current.
Now the Bohr's or planetary model of the atom seems be be many folks image, but it seems it really is more like a fog of electrons surround the nucleous. If one of our moving charges adds to an atom's charge that forces one out to do the same on down the line. For a charge to transit the distance takes under 50 picoseconds.
So even if our charge does not take the shortest possible path there is going to be an extremely small difference in the end result.
Again no excess charge stays and there must be a complete circuit to get the current.
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Hi Tryphon,
It gets tiresome to have your 42 years of experience ignored over and over again. 40yr. ago we hand tested IC's by the 10's of thousands and these contact issues were never a major problem. We trim amplifiers to uV offsets and -140dB CMRR/PSRR (8000 or more on a wafer) do you you think we stop every few hundred and clean the probes?
Thank you for all your efforts, I will be delayed in my version due to one of those things that rarely happen. The seller on our new house can not provide clean title, such is life where properties go back to the 1800's or much further. So I remain in limbo, homeless till who knows when.
Well, if you want audiophile quality microvolt offsets, yes..😉
Aluminum and hardened steel probes, what contact potential?
If you want, I can send you extra newspapers, you crinkle them up and stuff them under your shirt, keeps you warm..😀
My house is from the 1890's. Luckily, I didn't have such a problem.. good luck..
ps...last night, turned on the AC, when the stat relay clicked, a bang from the compressor outside..😡 And yah, breaker tripped. Tonight I'll sweep out all the starting cap shreds from the unit..
John
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Yes Scott, that is a bugger, I know people who have sold, run into problems and never been able to afford to buy again. I hope it works out soon
There should be title insurance on a prior sale! When I had a problem the insurer fixed it fast.
No there is no policy to my benefit, the current owner bought the house with an unprobated will involving the property and wants me to assume the same risk. Probate takes 6 months or more and I'm not interested, there are other houses. I have not bought the house and I have no damages, I can recover all my earnest money and move on. Living in temp housing with all my stuff in storage sucks that's all.
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Well he can spend $5,000 and six months to do a quiet title action. He possibly hasn't been there long enough to do an adverse possesion and in Massachusetts that doesn't always work even with 20 years of adverse possesion.
You can ask for your money back and hopefully get it all. You also might consider offering half the original amount and assume the title risk.
But we might actually agree on something, bite the bullet and move on.
It's even worse!
It only applies to the speed of light in a vacuum (is there a true vacuum?) and not through any differing gravitationally warped SpaceTime (good luck finding that!)!
We're screwed!
😀
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