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[nievesoliveras]

@all

In the meantime I can get the crystal radio to output some radio sound I will post some transistor circuit I have been studying as reference.

I found a circuit that was created by a person called @kubikop and used successfuly by @lidmotor to keep two led box alive and shinning for a long time by switching the two AA batteries everyday.

These circuits can be used to develop an automatic battery switcher. I know that @thedaftman did it already, but I find it very complicated. I need a simpler automatic switcher.

Maybe studying these circuits I can understand better the other battery switchers available and choose the best one.
The last two circuits are a simple radio transmitter.

Jesus

[jadaro2600]

I just made a one way conductor - I don't know how well it works though, it's not giving me any readings on the diode tester, so I assume the forward current is greater than 2v - my DMM can't test beyond that.

It's actually a verdigris diode.  This is almost any sort of copper oxide, in this case it could be copper chloride, copper carbonate, copper sulfate, copper dioxide, but this is green, so it's either copper carbonate or copper chloride.

I corroded some copper strips in acetic acid, hydrogen peroxide , magnesium sulfate and sodium chloride, and god willing, it's bubbled and fumed, so I made all output gases go through a charcoal filter so I wouldn't die or anything..  the solution turned blue green overnight and the copper turned a bright lustrous color, so I pulled it out and let it dry for a few hours, at which point it turned very green...SO, I assume that All I have to do is rub this solution on it to get it to do what I want - I'm going to see what kind of things this solution evaps into...

This is essentially the kind of atmosphere that makes copper turn green, just at extreme combinations.

I'll have to try the combinations separately.


I used alligator clips to clip onto a pencil lead and the corroded copper strip and then attached their other ends to my DMM... I pushed the graphite onto the corroded copper sheet and tested conductivity.  It only conducted in one direction..and in the other it gave a resistance reading.

The graphite seems to be the ground side of this diode.  The resistance readings vary ..but it doesn't seem to want to conduct in the opposite direction.

It this point, I'm thinking of a better setup..and maybe a way to corrode the copper with electrolysis / hydrolysis etc.
The readings were zero conductance, and 18 megaohms when flipping the

[nievesoliveras]

I just made a one way conductor - I don't know how well it works though, it's not giving me any readings on the diode tester, so I assume the forward current is greater than 2v - my DMM can't test beyond that.

It's actually a verdigris diode.  This is almost any sort of copper oxide, in this case it could be copper chloride, copper carbonate, copper sulfate, copper dioxide, but this is green, so it's either copper carbonate or copper chloride.

I corroded some copper strips in acetic acid, hydrogen peroxide , magnesium sulfate and sodium chloride, and god willing, it's bubbled and fumed, so I made all output gases go through a charcoal filter so I wouldn't die or anything..  the solution turned blue green overnight and the copper turned a bright lustrous color, so I pulled it out and let it dry for a few hours, at which point it turned very green...SO, I assume that All I have to do is rub this solution on it to get it to do what I want - I'm going to see what kind of things this solution evaps into...

This is essentially the kind of atmosphere that makes copper turn green, just at extreme combinations.

I'll have to try the combinations separately.


I used alligator clips to clip onto a pencil lead and the corroded copper strip and then attached their other ends to my DMM... I pushed the graphite onto the corroded copper sheet and tested conductivity.  It only conducted in one direction..and in the other it gave a resistance reading.

The graphite seems to be the ground side of this diode.  The resistance readings vary ..but it doesn't seem to want to conduct in the opposite direction.

It this point, I'm thinking of a better setup..and maybe a way to corrode the copper with electrolysis / hydrolysis etc.
The readings were zero conductance, and 18 megaohms when flipping the

Thank you @jadaro !

That is great!
The paste used to solder, if you let it on the copper wire, causes the same green oxide.
Maybe it is not with the same properties though.

Jesus

[jadaro2600]

Thank you @jadaro !

That is great!
The paste used to solder, if you let it on the copper wire, causes the same green oxide.
Maybe it is not with the same properties though.

Jesus

That's interesting you mention that, This might be the flux / rosin causing the metals to corrode.  ...seems like I've seen the same kind of stuff on battery terminals, ..but I'm told to avoid touching this.

I'll be sure to publish some more results - I might start another thread, or look for one where it's more relevant.  This seems a little off topic at the moment.  You may even consider starting one, you're ahead of me all together on the point-contact cat whisker.

[nievesoliveras]

That's interesting you mention that, This might be the flux / rosin causing the metals to corrode.  ...seems like I've seen the same kind of stuff on battery terminals, ..but I'm told to avoid touching this.

I'll be sure to publish some more results - I might start another thread, or look for one where it's more relevant.  This seems a little off topic at the moment.  You may even consider starting one, you're ahead of me all together on the point-contact cat whisker.

When a battery shows that green oxide, if you pour a little of soda from a cola can, it will disappear. It is more remarkably seen if you use baking soda mixed with a little water.
So if you want to check if your experiment results are that kind of oxide, mix a 1/4 spoon of baking soda with a 1/4 cup of water and put the copper you treated inside that solution for a few minutes, if the green oxide dissapears, the oxide is the same as the one produced by a battery. If it does not disappear, you have found something new.

Jesus