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[Thaelin]

   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]

   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]

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.



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]

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.



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]

@ 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