да, ребята... сколько раз вам ссылку не давай, а повторять все равно придется... (с) уже пишу крупно ОБРАТИТЕ ВНИМАНИЕ В КАКУЮ ТОЧКУ ПОДКЛЮЧАЕТСЯ ЭКРАН!!!
Here are some general design parameters for a coil:
Transmit Coil -- 25 to 30 turns of 22 gauge wire. Diameter 7 to 8 inches.
Receive Coil -- 200 to 300 turns of 31 gauge wire. Diameter 3 to 4 inches
Feedback Coil -- 6 to 10 turns of 22 gauge wire. Diameter same as receive.
Tank Capacitor -- 0.47uF
Generally the Receive is about half the diameter of the Transmit. So if you choose an 8 inch Transmit use a 4 inch Receive. Wind the Feedback Coil on top of the Receive coil. The wires are insulated so it ok to have the Receive and Feedback touching. The Transmit and Feedback coils can have the same wire gauge.
Here is a very very important point! The end of the Receive wire nearest the Feedback Coil must be connected to ground. In other word it must be connect to the loop shield and to the ground in the circuit. If you don’t do this the completed coil
will not operate correctly. The R null component of the coil will be excessive and may overdrive the detector. This has to do with the high capacitive coupling between the Receive and Feedback windings. Connecting the coils as I have outline above will solve the problem.
http://www.jb-ms.com/Baron/gb.htm
и не надо очень прошу брать какие-то свои "особые данные" с потолка и доказывать что это хорошо! все ЗАДОЛГО ЕЩЕ ДО ВАШЕГО РОЖДЕНИЯ ПРИДУМАНО!
В этой статье Джорджа Пайна написано ВСЁ! и расчеты, и какие брать как и куда подключать провода.