New Coil for Nupi's Pin Pointer

[chemelec]

Just for Curiosity I was experimenting with Nupi's Pin Pointer and I wound a coil on a bundle of Silicon Steel Laminates.
It Works, However with STRANGE RESULTS.

Setting it to the Normal setting of Detection (as Used with the Ferrite Core), it Only Detects Ferrous Metals.
Setting to the Opposite Setting, it only Detects Non-Ferrous Metals.

[/ATTACH]

[homefire]

Cool Beans. You may be onto a special purpose detector. What is this Silicon Steel ?

HF

[chemelec]

TRANSFORMER CORE LAMINATES
The Ones I used are the I's from E & I transformer cores.

These were out of a Power Transformer, But Smaller I's from a Smaller Audio Transformer are probably More suitable.
I Don't have any to try at this time.

Cool Beans. You may be onto a special purpose detector. What is this Silicon Steel ?

HF

[homefire]

Got it. Yea, some are Buggers to get apart.

[Polymer]

That's a really interesting observation. Cool!

I'll be trying a laminate like yours when I'm further testing the hollow ferrite rods, which are interesting too.

I'm still trying to find/learn a simple way to apply temperature compensating bias redesign to the Nupi PP,
although I have no experience with this.

It seems like those capable of doing this aren't interested, sigh ... yes, I am somewhat frustrated about this at the moment.

Keep on keepin' on, Polymer

[chemelec]

That's a really interesting observation. Cool!

I'll be trying a laminate like yours when I'm further testing the hollow ferrite rods, which are interesting too.

I'm still trying to find/learn a simple way to apply temperature compensating bias redesign to the Nupi PP,
although I have no experience with this.

It seems like those capable of doing this aren't interested, sigh ... yes, I am somewhat frustrated about this at the moment.

Keep on keepin' on, Polymer

Ideally a person would use a Bundle of Smaller Silicon Steel Wires.
I did a Google search to try and find these, but seems no one makes these.

The amount of temperature drift is TINY.
A Small Fraction of one degree in the transistor, So very Difficult to accomplish this.

[Polymer]

Ideally a person would use a Bundle of Smaller Silicon Steel Wires.
I did a Google search to try and find these, but seems no one makes these.

The amount of temperature drift is TINY.
A Small Fraction of one degree in the transistor, So very Difficult to accomplish this.

I couldn't find any Si-wire vendors either, but someone has made some and has done some research on it (pdf):

03lan smm mag wire.pdf

Perhaps 'floral stem wire' could be useful. It's usually plain steel and insulated.

http://www.papermart.com/floral-stem-wire/id=23479

Do you mean the self heating of the transistor in this case at being tiny?

I am looking at changes in ambient temperature (0 to 50 deg. C) which cause having to adjust the potentiometer
around 500 Ω upwards per degree to reach the most sensitive point again.

Aye, I found part of the Nupi PP circuit in the ITMD book. Surprise. It didn't register with me up till now.
The caption 'A Simple Probe That Works' just didn't ring any bells. 'Pinpointer' would've ... Oh well ...

I've got more deep reading and thinking to do. Have a nice evening, Polymer

[chemelec]

Perhaps 'floral stem wire' could be useful. It's usually plain steel and insulated.
http://www.papermart.com/floral-stem-wire/id=23479

Pretty Thick Insulation.
Just Mild Steel wire with a Varnish Coating Might be better.

Do you mean the self heating of the transistor in this case at being tiny?
YES

I am looking at changes in ambient temperature (0 to 50 deg. C) which cause having to adjust the potentiometer
around 500 Ω upwards per degree to reach the most sensitive point again.
Even a 1 Degree change is a problem.

Aye, I found part of the Nupi PP circuit in the ITMD book. Surprise. It didn't register with me up till now.
The caption 'A Simple Probe That Works' just didn't ring any bells. 'Pinpointer' would've ... Oh well ...
I have never seen this "ITMD" Book.

SEE MY ANSWERS in the Above.

[homefire]

Metglass is used in RFD in security tags. Can be tuned to alter the Magnetic flux at certain frequencies. This video shows it being used for a Magnetometer Detector. Wonder how it would work in a pin pointer Coil ?

https://www.youtube.com/watch?v=dP84iJlQCDI

https://en.wikipedia.org/wiki/Electr...e_surveillance

HF