Andy Flind MFD.

[Geo]

Connect a switch to power supply of LM3915 and check what its better, with or without it.

[abdou2014]

hi, i want to know from the designers of ANDY flind on the results i got with my new preamp,

spark 1.5 V battery 1.5 Meters, small screwdriver when moving 1 Meter, small magnet 1

Meter, and this with 16 cm coil or with 5 cm ferrite .

what amazed me is that at first, if I connected a coil with large inductance I only detect

ferrous metals and magnet them without sparks, but now I detect all with small inductance

coil .

[GOLDEN LILLY]

Hi abdou. What pre amp did you use? Did you use the pre amp of pdk?

[abdou2014]

Not PDK preamp , it's ma own designe

[abdou2014]

I tried my lrl outside, it gives some false signal from time to time , I don't like that ,

I change the preamp and the coil, I replace the coil with a loop like DCH85 one turn .

It is very interesting, better of the DCH with or without TDA because I made all the versions

I do not intend to add a stimulator because the sensitivity is very high

my DCH 85 version detected a spark lighter from 1 meter, and did not react to the hand near

the antenna , I have 3 meter with this configuration and detect the precious metals at 6 cm

[humhum]

High İmpedance Preamplifier , first stage was may be from Dear Maister FrancoItaly

[abdou2014]

No , I modified a very sensitive storm detector as preamp

[humhum]

This post general Sch was idea for All friend which need High impedance sensitive preamplifier , not for .....

[abdou2014]

new improvement, reacts to the hand and an aluminum plate 40cm x 40cm from 80cm ,

without stimulator, I believe this lrl is better than Alonzo pd

[abdou2014]

good evening everyone, I succeeded in making a gradiometer sensor, like the FGM or FLC, I noticed that in the ANDY 1 and 2 magnetometer circuit that there is only a display for a single polarity, I need of a circuit which has a reading of both north and south polarity, so that I can do the difference between ferrous metals and cavity , thanks.

[Geo]

Originally Posted by abdou2014

new improvement, reacts to the hand and an aluminum plate 40cm x 40cm from 80cm ,

without stimulator, I believe this lrl is better than Alonzo pd

So you wait to detect a gold coin from 80cm or 8m.....

[humhum]

Originally Posted by Geo

So you wait to detect a gold coin from 80cm or 8m.....

Yes Master Geo , You are Right that only high Sensibility not is enough for catch
phenomenon signal , need ...........

[Geo]

Really i can't understand why many members here show how their detector detects an object from 0.1 ... 1m. This is a job for a normal metal detector not for lrl.

[humhum]

Originally Posted by Geo

Really i can't understand why many members here show how their detector detects an object from 0.1 ... 1m. This is a job for a normal metal detector not for lrl.

They will learn over time, it takes a lot of experimentation to get the full result for
meter or Km .

[Nicolas]

Originally Posted by humhum

They will learn over time, it takes a lot of experimentation to get the full result for
meter or Km .

: D km

[abdou2014]

Originally Posted by Geo

Really i can't understand why many members here show how their detector detects an object from 0.1 ... 1m. This is a job for a normal metal detector not for lrl.

it is not the same Mr Geo, these results are without TX, only a receiver, contrary to the metal detector TX RX

[Geo]

Originally Posted by abdou2014

it is not the same Mr Geo, these results are without TX, only a receiver, contrary to the metal detector TX RX

What it means??? you can make a metal detector without emiting very easy but it will not be a lrl.....

Ohhh and something else..... most lrls don't work good over or near to targets.

[abdou2014]

I built two models which can detect metal without an emitter:

1 - work as a magnetometer, detect only ferrous metals

2- work as LRL, detect non-ferous metals, in junction with am

[humhum]

Originally Posted by Nicolas

: D km

: D km

[abdou2014]

Mr Geo i sent you msg

[Geo]

I am interesting to connect a radio inside the Andy's MFD.
TDA7000 is my selection.
Does anyone made this mod???

[abdou2014]

Yes i made it

[abdou2014]

I made all the combinations, and the only problem is the stability, maybe your design is perfect

[Geo]

Did you use transformer to drive the beep generator or you connected the audio out directly (via a cap) to generator input???
What radio did you use??

[abdou2014]

i use transformer between TDA radio and beep , I also have another trick of coupling between a commercial radio and the beep , but there is a difference between commercial and TDA