You can radically mitigate the issue by using a secondary container for that
which you'll use in a week or so, and only open the quart/gallon to dispense to
working container.
I have dry argon in my shack to purge gas space in any container that is
hygroscopic or oxidizes in presence
Yep. I worked at an company where we had some boards with very high
impedance circuitry (with the usual guard rings etc.). We tried many things
trying to get wave soldering and aqueous flux to work, but no amount of rinsing
washing got the surface conductivity down to where we needed it .
Don is exactly right about this. When I was at HP/Agilent, the company
directive was generally not to try to clean the rosin with alcohol.
(Rosin-core solder was used only in rework.) The rosin contains an acid
to help with the soldering, but the acid is locked up inside the rosin
where it
99% Isopropyl is available from Uline. Aerospace industry standard is
Miller-Stephenson Contact Re-Nu MS-530. Evaporates quickly and leaves no
residue. Great stuff but pricey and you'll have to work to find it.
GL - Steve WB6RSE
>
> Yup, it's the 90% stuff. It was impossible to get a year
When I have cleaned boards with IPA or other cleaners, I apply the IPA
only in a small spot with a q-tip and then blot it with a paper towel to
help dry it - do not flood the board.
I generally do not recommend cleaning boards, solder flux is
non-conductive and will normally not cause a
Yup, it's the 90% stuff. It was impossible to get a year ago, but not
too bad now. Still, I had to wait a month or so when I ordered it from
Amazon.
- Jerry KF6VB
On 2021-07-14 16:06, John Marvin wrote:
Hopefully this is obvious, but make sure you are using the 90-91%
Hopefully this is obvious, but make sure you are using the 90-91%
isopropyl alcohol, and not the 70% variety. It can still be hard to get
the 90% variety these days.
73,
John - AC0ZG
On 7/14/2021 4:41 PM, Peter Eijlander (PA0PJE) wrote:
Yes Jerry, isopropyl alcohol does this!
I once cleaned
Yes Jerry, isopropyl alcohol does this!
I once cleaned a working print of a GPS receiver with isopropyl alcohol
and it stopped working. Letting it be and trying it again next day
turned out it worked perfectly again.
From then on I leave a PCB to rest after cleaning to have the IPA dry
out
On 2021-07-07 12:29, Victor Rosenthal 4X6GP wrote:
Remember PTTL?
Poorly Tinned Toroid Leads.
Actually, I suspect that when I scrubbed it with isopropyl alcohol, it
shorted out
one or more high-impedance crystals; because at one point, it was tuning
WWV with no heterodynes - just like an AM
Remember PTTL?
Poorly Tinned Toroid Leads.
Look for them.
73,
Victor, 4X6GP
Rehovot, Israel
CWops #5
Formerly K2VCO
https://www.qsl.net/k2vco/
On 07/07/2021 22:19, jerry wrote:
So I went out this morning to replace the CW filters with the upgrade
kit. Unsoldered the 5 crystals. Removed one of
So I went out this morning to replace the CW filters with the upgrade
kit.
Unsoldered the 5 crystals. Removed one of them - whups, it's got the
"S"!
That means that the upgraded crystals are already installed. I thought
there
was no "S" - it was hard to read with them installed.
So I
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