[MAGNETIC SENSOR...HELP!!!!!!!!!!!!!!!!!]

i guess magnetic sensors use magnetostriction effect......

[inductor]

if u want inductance for inductor with some other core ( other than air)

Relative permiability must be found

it is no more "Mo"(air core)
it ll be  "Mr"(relative permiablity)

[inductor]

if ur inductor is solenoidal..
inductance - L
Number of turns - N
Mo = (4*pi / 10000000)  ;  pi= 22/7
ength of the inductor = x
Area of circular cross section = A


formulae

L  =  ( Mo*N*N*A ) / x

* - multiplication

[MAGNETIC SENSOR...HELP!!!!!!!!!!!!!!!!!]

prateeksikka

i agree... simple relays can do tat...
but the thing is the field must be of great strength.......
its nt possible all time..

[MAGNETIC SENSOR...HELP!!!!!!!!!!!!!!!!!]

hi,

lost vikings
i feel ur post is the exact theory behind metal detectors,a weak rf range oscillator serves as the input,and sensing coil forms parts of tuned oscillator..

if u r interested in its working;
here it is..
when the coil is bought near a metallic object, magnetic energy is absorbed and oscillator fails to work. this can be detected by another circuit and alarm can be triggered

[Free sample chips!]

i am frm india..
can anyone suggest me the procedure of getting samples ???
wer shud i cntct...
shud i pay the postal?

[555 astable monostable]

u shud look over
1)connecting pin 4  to positive supply wen not in use........
2) grounding pin 5 wit a 0.01microfarad capacitor...(wen u r not using it)