Re: Homemade Circuit Boards
Clorox bleach does NOT contain Hydrochloric acid. I suggest you read the ingredients label before making a statement like that. The main ingredients in regular Clorox bleach are Sodium Hypochlorite
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Jim Sheldon
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#87991
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Re: Best wishes to our friends in India
Perhaps a warm climate, life lived outdoors or in extremely well ventilated buildings? Studies first started showing up about a year ago showing that Covid19 transmission was primarily airborne, and
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Jerry Gaffke
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#87990
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Re: Homemade Circuit Boards
Hi, Clorox and other brands of chlorine bleach are hydrochloric acid. I am going try that. I have also etched metal in apple cider vinegar to remove rust. 73, Bill KU8H bark less - wag more
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Bill Cromwell
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#87989
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Re: Best wishes to our friends in India
I wonder how feasible this is? https://hackaday.com/2021/04/26/indian-makers-respond-to-the-covid-19-pandemic-by-producing-oxygen-concentrators/ -- www.bitxmap.com ( http://www.bitxmap.com )
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Doug W
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#87988
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Re: Homemade Circuit Boards
Muriatic acid is HCL, hydrochloric acid so you are good to go. Bill VK7MX
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Bill Maxwell
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#87987
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Re: Best wishes to our friends in India
This came across my monitor this morning. It's work-safe. <
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Jim Strohm
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#87986
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Re: Best wishes to our friends in India
I¡¯m not an ICU doctor, and I¡¯m retired, but watching some of the presentations recently have brought out some rather fascinating insights People tend to die when they¡¯re put on the ventilators.
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Gordon Gibby KX4Z
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#87985
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Re: Best wishes to our friends in India
I defer to Gordon on this stuff, but here's my impression: It will be a year or so before everyone everywhere can be vaccinated. When a health care system is overwhelmed, lack of compressed oxygen may
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Jerry Gaffke
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#87984
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Re: Best wishes to our friends in India
Thanks Gordon. That clarifies a lot. Next question: Are cheap ventilators still needed...in the US, in India, or elsewhere? What is the next step...if any? Arv _._ wrote:
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Arv Evans
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#87983
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Re: Best wishes to our friends in India
Well let me see if I can straighten a few things out. I¡¯m not completely sure about the website not being updated but I think we had to freeze the design and there was some concern about some thing
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Gordon Gibby KX4Z
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#87982
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Re: Homemade Circuit Boards
Would swimming pool muriatic acid ( 14% ) work? We always have a lot of that laying around...to maintain our pool. - Jerry KF6VB
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[email protected] <jerry@...>
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#87981
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Re: Best wishes to our friends in India
Let's hope that the many countries that have the resources are mobilizing support quickly to help fill these needs that so suddenly hit you. Tom, wb6b
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Tom, wb6b
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#87980
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Re: Homemade Circuit Boards
Hi, I switched a long time ago to the hydrogen peroxide method.? I use hydrogen peroxide from the drug store combined with HCl, hydrochloric acid.? The acid is available at hardware stores, sold as
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Mark - N7EKU <n7eku@...>
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#87979
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Re: Talk: Does price buy Performance or Satisfaction in an HF Transceiver? by Frank Howell K4FMH
Hi, Jack, your point of view is not much different from mine. Bear in mind I am a mostly CW ham. I am thinking about putting in more than one controller. The primary controller is to operate the
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Bill Cromwell
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#87978
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Re: Best wishes to our friends in India
Arv: Off topic, but one of my grad school buddies took a job in DC at a small agency. A few months into the job, the director of the agency came around and told everyone to let the "In Box" stack up
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Jack, W8TEE <jjpurdum@...>
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#87977
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Re: Homemade Circuit Boards
Hi, This method seems fascinating. The person uses pages torn out of glossy magazines as a toner transfer paper to the PCB boards. https://www.youtube.com/watch?v=cVhSCEPINpM Are there any chemistry
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Tom, wb6b
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#87976
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Re: Best wishes to our friends in India
Jack Maybe Pogo was right "*We have found the enemy, and he are us!*". After all the FDA as a government entity is just the government employees that we hired to do things in our name! 8-) 8-) Arv _._
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Arv Evans
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#87975
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Re: Best wishes to our friends in India
Arv: I really don't know. All I know is that things were progressing rapidly and I know Gordon had one working on his coffee table! Then everything was turned over to the U of F team so they could
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Jack, W8TEE <jjpurdum@...>
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#87974
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Re: Homemade Circuit Boards
Most people who are doing at-home PCB etching are now using Vinegar for the etchant acid and Hydrogen-Peroxide as an accelerant. This seems safer and easier on the environment. Thin it with water and
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Arv Evans
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#87973
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Re: Best wishes to our friends in India
Jack Seemed that things died just after being submitted to the University of Florida. Was this killed by the FDA, or by the University of Florida? While it doesn't matter much now, it could be that
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Arv Evans
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#87972
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