PI power recovery?

[mickeu]

I thing about possibility to recover some dacay voltage from the PI coil. All we need to measure is +- 0,7 set up by diodes and everything above 0,7V is lost in resistor.
How to get everything above 0,7V then put it thrue transformer and send back to coil capacitor.

Any ideas?

[WM6]

I thing about possibility to recover some dacay voltage from the PI coil. All we need to measure is +- 0,7 set up by diodes and everything above 0,7V is lost in resistor.
How to get everything above 0,7V then put it thrue transformer and send back to coil capacitor.

Any ideas?

Discussed a couple of time here on forum (schematic inclusive). Do some search.

[mickeu]

Discussed a couple of time here on forum (schematic inclusive). Do some search.

TNX WM6

[Teemo]

I thing about possibility to recover some dacay voltage from the PI coil. All we need to measure is +- 0,7 set up by diodes and everything above 0,7V is lost in resistor.
How to get everything above 0,7V then put it thrue transformer and send back to coil capacitor.

Any ideas?

I was thinking about exactly the same thing when I built my detector. To recycle the energy instead of wasting it to hear the resistor. And this is what I ended with:
http://www.geotech1.com/forums/showt...tector-project

Regards

[Tinkerer]

Power saving PI

I was thinking about exactly the same thing when I built my detector. To recycle the energy instead of wasting it to hear the resistor. And this is what I ended with:
http://www.geotech1.com/forums/showt...tector-project

Regards

Attached is a simulation of a traditional PI TX current pulse and the corresponding target response.
TX=12V=40us Power consumption=100mA
The yellow trace is the TX current wave form.
The Blue trace is the Target response wave form.

The second simulation is a power recycling PI, notice that there are many more pulses per second, for better S/N, by integrating more pulses.

TX=12V=67us Power consumption=26mA

I would like to try your method of signal processing, as it will give a good definition of the TC of the targets.

[Teemo]

Hi Tinkerer, your first graph(classic PI) I can understand, but what is the circuit for the second(power recycling)?

[techo_bob]

Hi Tinkerer

Have you posted on Geotech the schematic for the recycler driver.

Looks interesting !!!

Thanks in advance Bob..

[Aziz]

Wow, that is looking very very interesting!!!
I want to have that schematics as well...
It should even beat the LameBin detector.

Aziz

[moodz]

....is the real engineering problem saving power or detecting metal ? Pulse induction uses pulses where there is a pulse then nothing and repeat etc. If the current or voltage does not stay ..not cross... At some fixed voltage or 0 for some time then it is not a pulse but a continuous waveform wideband VLF if you like.

[Tinkerer]

Hi Tinkerer, your first graph(classic PI) I can understand, but what is the circuit for the second(power recycling)?

The second, power recycling circuit is the classic TEM circuit. As you see, it gives twice the amplitude of target response and uses one quarter of the power.
I have posted many versions of the circuit, but I will post it again with further explanations, later today. As Aziz commented on your circuit, it is a mini TEM, so you got close to it yourself.

The classic TEM TX will probably work very well with your signal processing.

[Aziz]

A good example of pulse and continious wave "pulse":
Pistol: peng, pause, peng, pause, peng, ...
Machine-gun: ra-da-da-da-da-da-da-da-da-da...

Aziz

[Tinkerer]

....is the real engineering problem saving power or detecting metal ? Pulse induction uses pulses where there is a pulse then nothing and repeat etc. If the current or voltage does not stay ..not cross... At some fixed voltage or 0 for some time then it is not a pulse but a continuous waveform wideband VLF if you like.

Your point has been discussed at length on the Tinkerer forum. I asked if this continuous wave form should get a different name. The answers were nearly unanimous, saying that the TX is pulsed with a rectangular voltage pulse so it should be named Pulse Induction technology.
I always refer to the traditional PI and the TEM PI, to make the difference clear.

[Tinkerer]

A good example of pulse and continious wave "pulse":
Pistol: peng, pause, peng, pause, peng, ...
Machine-gun: ra-da-da-da-da-da-da-da-da-da...

Aziz

Yes, you really made a great invention.

[Aziz]

Yes, you really made a great invention.

No, that was a prior art good old technology. It was forgotton due to the PI hype (mono coil TX).
Aziz

[Aziz]

But my new transmitter is giving much much more target response.
I could achieve a great detection distance. Even for the giant whopper nuggets in the highly mineralized ground.
The WBGB should work very nice on it too.

I haven't published the new transmitter yet.
Aziz