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Tricks of the Trade - knowledge for every day life
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Sal Ammoniac:

--- Quote from: DrG on March 27, 2021, 03:54:25 am ---Yep, I used to use ferric chloride to etch the date back on a certain type of US 5C. The dates were at a high point for wear and "dateless" nickels of this type were common. You could, however, etch the date using ferric chloride. To keep the ferric chloride right around the date area, I would use a permanent marker to make a border. After the date was revealed, acetone would remove the marker.
--- End quote ---

The same technique is used to reveal the serial number on guns where the number has been filed down.
VK3DRB:
Best thing I learnt in electronics that helps with everyday life is CONTROL THEORY. It is part of all engineering degrees and it is arguably the most useful subject of all. We use it in electronics design, but control theory maps out to most things we do in life. During COVID, applying control theory increased my wealth significantly. Control theory has helped me understand the spread of the virus and predict the lock downs a lot better than most people. It is unfortunate that most politicians and their advisers in Australia do not apply control theory to their decision making. In fact there are instances where they clearly have demonstrated they do not understand it.

I don't overreact to negative feedback, and positive feedback is neither here nor there ;D.
EEVblog:
Don't know if it's already on here, but turning a can of compressed air upside down turns it into a handy freeze spray for detecting faulty components.
IDEngineer:

--- Quote from: EEVblog on December 23, 2021, 10:45:42 pm ---Don't know if it's already on here, but turning a can of compressed air upside down turns it into a handy freeze spray for detecting faulty components.
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REALLY? That could be exceptionally useful....

Escaping (really, expanding) gas drops in temperature, of course, but I didn't know that inverting the can would make a difference. Must try that immediately!
AlfBaz:

--- Quote from: EEVblog on December 23, 2021, 10:45:42 pm ---Don't know if it's already on here, but turning a can of compressed air upside down turns it into a handy freeze spray for detecting faulty components.

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LOL.
Just  saw this this thread and as I was reading through it I thought to myself no one's mentioned the upside down can trick yet, I'll add it.

Just to add to that, freeze spray upside down can be used as compressed air
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