Can you help me to build VLF metal detector?

[shaarawi1984]

Hi;

I don't know if anyone could help me in building a metal detector using VLF (IB) method.

I designed a one but I don't know if it will work or not, what I will do is using Wein-Bridge oscillator to produce 5000Hz, and I will use a coil with the following specs:

Transmitter coil is 85 turns with 6.375 inch inner diameter, the receiver coil is 275 turns with 3.1 inch inner diameter, and the feed back coil is 27 turns located at the outer loop of the receiver coil (this coil is taken from Internet).

My questions are:
1-Using Wein-Bridge oscillator as the oscillator for this detector is correct or not?

2-The value of the capacitor should be in parallel with the transmitter coil is about 200micro Farad in order to get the resonant case at 5000Hz (L=4.8micro H, f=5kHz), is this correct or not?

3-Do I need a capacitor in parallel with receiver coil like what we do in the transmitter coil, if yes how could I estimate it?

thank you very much

[bigjohn]

Originally Posted by shaarawi1984

Hi;

I don't know if anyone could help me in building a metal detector using VLF (IB) method.

I designed a one but I don't know if it will work or not, what I will do is using Wein-Bridge oscillator to produce 5000Hz, and I will use a coil with the following specs:

Transmitter coil is 85 turns with 6.375 inch inner diameter, the receiver coil is 275 turns with 3.1 inch inner diameter, and the feed back coil is 27 turns located at the outer loop of the receiver coil (this coil is taken from Internet).

My questions are:
1-Using Wein-Bridge oscillator as the oscillator for this detector is correct or not?

2-The value of the capacitor should be in parallel with the transmitter coil is about 200micro Farad in order to get the resonant case at 5000Hz (L=4.8micro H, f=5kHz), is this correct or not?

3-Do I need a capacitor in parallel with receiver coil like what we do in the transmitter coil, if yes how could I estimate it?

thank you very much

ya mite be counrty if that dont make sencse kinda like a forien language.