Post O scope of signal from gold or diamond

[Esteban]

Laugh, but you don't know why this implementation. This be very happy me!

Ok now let us get back to this LRL stuff.
What is it that hte photo transistor is picking up.
I would like to test this

OK, was simple. Oscilloscope capture the signal and appears a luminous point in the screen. The phototransistor sense this point.

There are two types of electronic LRL: 1. For buried for long time items. 2. In the air or not buried item or buried for short time. The oscilloscope was used for to show this second in air detection type. In the past the second type was common used, not deppendent of phenomenon of long buried items. But as used radio today degenerate impracticable regarding all types of interference, except in closed inland.

[Clondike Clad]

oscope signal

What type the signal is being generated?
Is the signal comming from the target ?

[Clondike Clad]

detector

I was looking at the LRL and now i see the Photo transistor is being used as a pickup on the scope but what is the detector part is picking up.
also why not up the gain on the scope to see the change in voltage.
Why the photo transistor?

[Esteban]

What type the signal is being generated?
Is the signal comming from the target ?

Was a type of point.

I use the terminology "signal" just for to refer the umbalance in circuit. No signal was generated by the target in air.

[Esteban]

I was looking at the LRL and now i see the Photo transistor is being used as a pickup on the scope but what is the detector part is picking up.
also why not up the gain on the scope to see the change in voltage.
Why the photo transistor?

As the detector was not much stages and as the point is in the screen, the more rapidly at hand was a phototransistor and a beep generator (this is common in electronic LRL. And usual in workbench).

[Fred]

I remember that maybe 15 years ago this was taken. When gold was detected a phototransistor catch the small difference and produce the audio.

This is schematic of a magnetometer.You dont need to connect anything to the scope´s input,the local field will deflect the spot.
Fred.

[Esteban]

This is schematic of a magnetometer.You dont need to connect anything to the scope´s input,the local field will deflect the spot.
Fred.

Magnetometer is for iron, don't understand.

[Fred]

Magnetometer is for iron, don't understand.

Magnetometer is for magnetic anomaly
I dont understand either, i am making a comment about your circuit.
Of course with a LDR or photo transistor you could detect changes in voltage input, but that would be a very complex way to make a trigger.
Regards,
Fred.

[Esteban]

Magnetometer is for magnetic anomaly
I dont understand either, i am making a comment about your circuit.
Of course with a LDR or photo transistor you could detect changes in voltage input, but that would be a very complex way to make a trigger.
Regards,
Fred.

Maybe is complex or not (really simple phototransistor/photodiode-555 circuit), but if we don't ear as a beep, we are not happy!

[Esteban]

Magnetometer is for magnetic anomaly
I dont understand either, i am making a comment about your circuit.
Of course with a LDR or photo transistor you could detect changes in voltage input, but that would be a very complex way to make a trigger.
Regards,
Fred.

Magnetic anomaly for a single coin is small. For absorptive LRL type (pasive) the rule is few turns wire for non ferrous metal. I wound in ferrite core 5,000 ohms and probe as electronic LRL. What happens? Nails and stainless steel coin I found at max. 1.5 meters distance.

[joecoin]

Hi,
yes he could do... but why he have to do ?

I think he knows what kind of signals or variations there are (if any) ... so he doesn't need scope on the forest to know what's going on... assuming all these LRLs work and are not just self convincements... selective memory stuff... etc etc etc

If he will show you the signals or signals variations maybe you'll understand which principle is behind that things... the OPERATING principle I mean (always... cause I'm skeptic... IF IT EXIST FOR REAL).

Now... do you think really he wanna tell you or show pictures of that ?

I think not... cause otherwise he posted already that stuff here... are years now we are talking about the same things and that we're making same polemics here... the same as in Robert's post... I've done myself for a number of months.

If any principle exist... he will not tell you about... will not show pictures of it... you will not get anything useful to build device or similar stuff ... but just will see some block diagram or minimized schematics and some old photos. You know already.

So... or you belive his words as them are... without proofs I mean, or you'll better just ignore all this stuff of LRL and start building your next conventional metal detector.

Really easy !

Kind regards,
Max

I don't know why he would have to do this, he said "I can't to imagine running in the inland, forest, etc., with an oscilloscope or similar instrument trying to capture the phenomenon in a screen.", so I showed him an oscilliscope that he could run with. I don't care if he shows pictures or not. I'm just helping solve the problem of taking readings IF HE WANTS TO.

[J_Player]

I'm just helping solve the problem of taking readings IF HE WANTS TO.

I think he already solved the problem of taking a reading by taping a phototransistor on the oscilloscope screen. The final signal was a beep sound that cannot be shown in a picture.

Best wishes,
J_P