how to make coil??

[msovais]

i want to make coil of 150uH....can any one tell what number of turns and diameter will be used?

 

[Super_voip]

try https://www.lalena.com/Audio/Calculator/Inductor/ and if that doesn't help try googling inductance calculator. Did you know that google is anumber with 100 zeros ie 10 to the 99th

 

[Super_voip]

googol is the large number 10to100, that is, the digit 1 followed by one hundred zeros (in decimal representation). The term was coined in 1920 by nine-year-old Milton Sirotta, nephew of American mathematician Edward Kasner. Kasner popularized the concept in his book Mathematics and the Imagination

 

[msovais]

can i use simple 150 uH inductor in this ckt..

 

[ronsimpson]

metal detector

Your coil depends on what you are looking for (metal detector).
My old metal detector has a series of coils. A 10” coil for looking for large objects many feet away. There are sever smaller coils for find smaller objects. The smallest is only 0.5”.

 

[Gayan Soyza]

Its better use a ferrite core or iron core inductor as it is in the diagram to increase the sensivity.

Also it is better you add a driving transistor to the output LED without driving directly.

It might work for a small inductance but don’t know how much DETECTION range having for 150uH inductor.

If you feel the detection range is not enough then by adjusting the TUNED CIRCUIT (inductor + C) can vary the sensivity.

 

[chemelec]

can i use simple 150 uH inductor in this ckt..

The Coil for This Detector MUST be Wound on a Small "POT CORE". And Ideally with "Litz" Wire.

This is a Very Short range Detector, Mainly designed to detect the "Teeth on a Gear" or other Simular types of Applications.

Maximum Detection Distance is Less than 1 Inch.