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Author Topic: Feedback To Source  (Read 387414 times)

Thaelin

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Re: Feedback To Source
« Reply #435 on: March 30, 2009, 04:51:23 PM »
   Next time you are down at the local junk store, look for an old broken stereo
receiver. On most of them you find a bunch of glass encased diodes in the FM
section of it. These are high freq signal diodes. Will work for what you are trying
to do. Just remember that they will not convey much current to the output.

thaelin

nievesoliveras

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Re: Feedback To Source
« Reply #436 on: March 30, 2009, 08:22:16 PM »
   Next time you are down at the local junk store, look for an old broken stereo
receiver. On most of them you find a bunch of glass encased diodes in the FM
section of it. These are high freq signal diodes. Will work for what you are trying
to do. Just remember that they will not convey much current to the output.

thaelin


Thank you @thaelin !
I will look for an old stereo receiver.

I just finished the bluing of the blade today and made a lot of tests.
At least this time the receiver made a low buzzing sound when I moved the pencil lead slowly on the blade.
But if I take the fingers off of the cat whisker, it does not produce any buzz sound.

That could mean that it needs a better antenna or a better ground. Because the body serves as antenna or as ground.

Jesus

jadaro2600

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Re: Feedback To Source
« Reply #437 on: March 30, 2009, 10:50:52 PM »
Thank you @thaelin !
I will look for an old stereo receiver.

I just finished the bluing of the blade today and made a lot of tests.
At least this time the receiver made a low buzzing sound when I moved the pencil lead slowly on the blade.
But if I take the fingers off of the cat whisker, it does not produce any buzz sound.

That could mean that it needs a better antenna or a better ground. Because the body serves as antenna or as ground.

Jesus

Have you tested the continuity of the diy diode? ..will it conduct in only one direction?

This may seem dangerous, but there is a process called brazing, which is what  they use to weld things together, it inadvertantly changes the properties of the metals a little, and this results in the blueing you need, you may try a point-contact short with a 12v battery - something like taking your diode and christening it with extreme current by attach the negative to the razor and the positive to the other end of the diode, and  then touching the point cantact to the razor - this would create an on-spot blue'd area.

:P

This may or may not work - I would set the rest of the components aside, this type of operation is electrically violent.

You would essentially be shorting the circuit between a positive and negative pole of the battery AT the point where your material touches the razor.  You could limit the current with a spare fuse, but the initial current is what you would need.

nievesoliveras

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Re: Feedback To Source
« Reply #438 on: March 31, 2009, 12:47:11 AM »
Have you tested the continuity of the diy diode? ..will it conduct in only one direction?

This may seem dangerous, but there is a process called brazing, which is what  they use to weld things together, it inadvertantly changes the properties of the metals a little, and this results in the blueing you need, you may try a point-contact short with a 12v battery - something like taking your diode and christening it with extreme current by attach the negative to the razor and the positive to the other end of the diode, and  then touching the point cantact to the razor - this would create an on-spot blue'd area.

:P

This may or may not work - I would set the rest of the components aside, this type of operation is electrically violent.

You would essentially be shorting the circuit between a positive and negative pole of the battery AT the point where your material touches the razor.  You could limit the current with a spare fuse, but the initial current is what you would need.

Thank you @jadaro !
I dont want to damage my receiver with a battery short circuit. But I will check if the cat whisker diode will conduct to just one direction.

Jesus

slayer007

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Re: Feedback To Source
« Reply #439 on: March 31, 2009, 02:50:36 PM »
@ Jesus

I don't know if you seen this video but it may help you with your setup.

It shows how to make a foxhole radio.

It's all most the same thing your doing.


http://www.youtube.com/watch?v=skKmwT0EccE

nievesoliveras

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Re: Feedback To Source
« Reply #440 on: March 31, 2009, 04:20:30 PM »
@ Jesus

I don't know if you seen this video but it may help you with your setup.

It shows how to make a foxhole radio.

It's all most the same thing your doing.


http://www.youtube.com/watch?v=skKmwT0EccE

Thank you @slayer007 !
That is exactly what I did! The only difference is that mine does not get any radio sound.

I checked the diode and it conducts electricity both ways.
Now I will try with a 1N60 diode I have available.

Jesus

jadaro2600

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Re: Feedback To Source
« Reply #441 on: April 01, 2009, 02:15:02 AM »
Always, anxious to help...


You might try turning your coil on it's side, adjusting it by 90 degrees, I know this may sound strange and irrelevant, but your coil may be oriented in such a way as to gather signal from a stronger, non radio source...  such as a nearby light bulb, or an in wall wire.

It's going to be a long time before I can test my fishing-pole aerial, the weather here just stays bad lately.


nievesoliveras

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Re: Feedback To Source
« Reply #442 on: April 01, 2009, 03:04:44 PM »
Always, anxious to help...

You might try turning your coil on it's side, adjusting it by 90 degrees, I know this may sound strange and irrelevant, but your coil may be oriented in such a way as to gather signal from a stronger, non radio source...  such as a nearby light bulb, or an in wall wire.

It's going to be a long time before I can test my fishing-pole aerial, the weather here just stays bad lately.


Thank you @jadaro !
I have seen lately different kind of crystal radioes. And must of them are on the way you recommend. Just a few are on the way I am doing it.

Jesus

jadaro2600

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Re: Feedback To Source
« Reply #443 on: April 01, 2009, 11:57:35 PM »
..wish I could get a hold of some varicaps like that.

nievesoliveras

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Re: Feedback To Source
« Reply #444 on: April 02, 2009, 02:15:37 PM »
..wish I could get a hold of some varicaps like that.

If you want one of those varicaps or the complete radio kit, look here.

http://www.xtalman.com/

Jesus

nievesoliveras

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Re: Feedback To Source
« Reply #445 on: April 03, 2009, 05:20:28 PM »
@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

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Re: Feedback To Source
« Reply #446 on: April 04, 2009, 12:15:42 AM »
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

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Re: Feedback To Source
« Reply #447 on: April 04, 2009, 12:58:22 AM »
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

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Re: Feedback To Source
« Reply #448 on: April 04, 2009, 01:06:58 AM »
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

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Re: Feedback To Source
« Reply #449 on: April 04, 2009, 01:24:06 AM »
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