John Curl's Blowtorch preamplifier part III

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I saw those. I was a little worried about the Galden vapor. It's inert and non-toxic itself, but it's PFPE (perfluoropolyether) and compounds used in the manufacturing of other PF items are not good and often present in low levels as a contaminant in the final product. PFPE is mentioned but I'm not sure there is any data. Still, we wanted a larger volume anyway so we got the conventional oven. I am not a chemist, so there may be no issue here.

https://www.epa.gov/sites/productio...rth_kansas_presentations_september_5_2018.pdf

Yes, the IMES is lab size. I do only design and it helps to put an FPGA on a prototype
board. My customers have the production machines, all vapour phase with
placement robots.

Galden as a liquid and as vapour is harmless. It is the industry standard for
quality soldering.

But if you overheat the vapour so much that it starts decomposing chemically, then
you better run.

So the oven must be temperature-limited to safe levels by design. And there also
must be enough liquid Galden above the heater. That limits the working temperature
to the typ. 240°C required for leadless solder. The board does not get hotter than this,
but the condensing vapour makes sure that the required temp. is reached everywhere.
There is a lot of energy absorbed and set free at the boiling point.

Compare that to the typ. 370°C used for hand soldering or the ill-defined
temperature for infra-dead. The Chips are usually black and the leads are
metallic-reflective. Just the opposite from that what's required for stress free
soldering. What the thermometer shows has not much to do with the
solder joints.

have a nice Sunday,
Gerhard
 
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No, methinks that the post is proof that it happens, whatever it may be.
Yes, who cares about the proposed explanations, the important part is that according the researchers the effects described were consistent and repeatable....the implications of this research are immense.

We are moving into 5G age of blanket coverage of mm wave radiations and already people are reporting adverse effects.....IMO (and not just mine) this is of great concern and the biophysical reasons need to be discovered and remedy or prevention implemented.


Dan.
 
Science is a belief system, and fortunately for us all it happens to be largely true. For example, you cannot do science without an underlying assumption that the universe is rationally explicable yet there is no a priori reason why this should be true - even Einstein was puzzled by this. There are other belief systems, which may or may not be true and may or may not conflict with science. Science gets in a mess when it claims to be the only true belief system (which is clearly a 'faith' statement), or if it claims that it is not a belief system.
:up:.

Dan.
 
The important thing with the zobel is that you don't end up increasing the inductance through the RC between terminals.

The wire leading to the zobel is the inductive part of a pi filter, thus it's wire spacing and length matters, and shouldn't be changed. Are the wires longer than necessary to reach the posts? It could be intentional.

Absolutely correct!!!!
And verified.

I’ll be sure not to shorten them any more than I have to when I cut the connector off. And will leave the zobel alone.
 
Yes, who cares about the proposed explanations, the important part is that according the researchers the effects described were consistent and repeatable...

Sorry Dan, explanations of creating entangled particles can be found in numerous scientific journals. Shining a laser pointer through a bottle of water with aspirin dissolved in it does not create entangled photons. This stuff reads like Machina Dynamica or Bybee copy.
 
Ummmm, that's why I said who cares about their theories, the important part is their experimental findings.
If the explanation is not to do with 'quantum entanglement ' then what is the mechanism explaining the experimental findings ?.
Also what is quantum entanglement really.......resonance coupling/phase locking/energy transfer at a distance ?......or what ?.

Dan.
 
The wire leading to the zobel is the inductive part of a pi filter, thus it's wire spacing and length matters, and shouldn't be changed. Are the wires longer than necessary to reach the posts? It could be intentional.

Interesting then that the wires on one set are 1.5” longer....about 20% longer than the total length of the shorter set......apparently they didn’t get the memo in Taiwan?
 
Incorrect. science is pretty much the opposite of a belief system, it's a process and a set of tools, in that *everything* should be tested and verified, not taken as given. There is nothing taken as a given.

You guys are talking past each other, fyi. Both what you and DF96 write is correct and complementary.

Under the hood of every theory we have is "we believe this is the way it works", which gets tested and tested again to a point where this belief is essentially proven, but unless somehow we manage to sample the entire universe (or truly whatever it is), there's no way for us to say that there are no exceptions to the rules we make.

Semantic difference in practice, but nonetheless a real one. 🙂
 
If the explanation is not to do with 'quantum entanglement ' then what is the mechanism explaining the experimental findings ?.

Nobody will seriously look into these, unless you or anybody else can show reliable experimental findings (meaning, relevant data of a reproducible experiment). Your prose does not qualify, therefore the only ones jumping in are crackpot scientists.
 
Interesting then that the wires on one set are 1.5” longer....about 20% longer than the total length of the shorter set......apparently they didn’t get the memo in Taiwan?

It's more likely that it was just written off as wire parasitics. I wonder if anyone here knows how to find an objective target for the parasitic pi filter or if it is all just guesswork and rule of thumb.
 
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