Pulse Detector Depth Proformance

[daverave]

Hey Dave was it you that was experimenting with a frequency counter on the output of the preamp ? what was the outcome of that ?

Hi 6666....just come on the computer 00.57 am as i had a very bad panic attack which made me feel very ill...ive never experimented with frequency counter on output of 1st amp could have been someone else.

[6666]

Hi 6666....just come on the computer 00.57 am as i had a very bad panic attack which made me feel very ill...ive never experimented with frequency counter on output of 1st amp could have been someone else.

Hi Dave ok thanks, it must have been somebody else, my PC crashed a while back and I lost all my thread book marks, I seem to recall whoever was talking about useing a freq counter on their surf pi was getting some interesting results, I hope you are feeling better, cheers.

[greylourie]

Hey Dave was it you that was experimenting with a frequency counter on the output of the preamp ? what was the outcome of that ?

Frequency counter ? Or one of those mini oscilloscopes, like here. https://youtu.be/ch9Iy8X5M4U

[daverave]

hello greylourie...i did try a mini oscilloscope a long time ago but it was useless on the detector as could not be seen in day light..it just displayed the back emf curve...but after that i started to use a lcd display showing two bar graphs...i used two samples...one of all met al and the other later sample to help to determine if a large target like a can or other item...i found it very useful.

[ionut_mtb]

hello greylourie...i did try a mini oscilloscope a long time ago but it was useless on the detector as could not be seen in day light..it just displayed the back emf curve...but after that i started to use a lcd display showing two bar graphs...i used two samples...one of all met al and the other later sample to help to determine if a large target like a can or other item...i found it very useful.

I was thinking to make a pi same like you said, with another two samples to identify high conductivity targets or large targets, by using another chanel and at the output to use 555 for diferent tone. If target is low conductive you will get one tone, if is high conductive the second chanel will change the tone in the speaker. And you will decide if want to dig the high cond targets. Of course deep high conductive or large targets at first will give as low conductive, but if you start digging and get closer to it the audio will change to high cond.

[daverave]

I was thinking to make a pi same like you said, with another two samples to identify high conductivity targets or large targets, by using another chanel and at the output to use 555 for diferent tone. If target is low conductive you will get one tone, if is high conductive the second chanel will change the tone in the speaker. And you will decide if want to dig the high cond targets. Of course deep high conductive or large targets at first will give as low conductive, but if you start digging and get closer to it the audio will change to high cond.

It is certainly worth doing as i found it very useful if to dig or not to dig..i havent used different tones like you are planning just a single around 800 hz tone.

[ionut_mtb]

It is certainly worth doing as i found it very useful if to dig or not to dig..i havent used different tones like you are planning just a single around 800 hz tone.

i came up with this example of surf pi, what do you think? i'm not so good with theory in electronics, my brain does not support to much information )

ch1 will be actualy allmetal and when big metal will come as a target the output audio will be mixed.

[daverave]

i came up with this example of surf pi, what do you think? i'm not so good with theory in electronics, my brain does not support to much information )

ch1 will be actualy allmetal and when big metal will come as a target the output audio will be mixed.

[ATTACH]39384[/ATTACH]

Have you done any experimenting with this circuit ???? my brain the same cannot process too much information...i just do things by trial and error...i did once modify a hammer head circuit so the vco worked at much higher frequency ins tead of click click and i included also amplitude as well than pitch...i supprised myself at the time cause it worked.....but that project ive shelved for now and i tended to concentrate on the surf pi.....to be honest the only audio i really like the sound of is that on the whites tdi series...which i would have no idea how to implement....so for me the surf pi has gone as far that i can do with just the lcd meter.

[ionut_mtb]

Have you done any experimenting with this circuit ???? my brain the same cannot process too much information...i just do things by trial and error...i did once modify a hammer head circuit so the vco worked at much higher frequency ins tead of click click and i included also amplitude as well than pitch...i supprised myself at the time cause it worked.....but that project ive shelved for now and i tended to concentrate on the surf pi.....to be honest the only audio i really like the sound of is that on the whites tdi series...which i would have no idea how to implement....so for me the surf pi has gone as far that i can do with just the lcd meter.

no, i did not experiment nothing. now that good weather came up, i want to spend more time detecting and doing other hobbies of mine. I did build an surf pi and a baracuda pi but still need to finish coils for them (enclose). I found this interested thread but, same, did not tried. maybe in the near future.

http://www.geotech1.com/forums/showt...ighlight=manta

[6666]

Frequency counter ? Or one of those mini oscilloscopes, like here. https://youtu.be/ch9Iy8X5M4U

Yes at the time he called it a frequency counter