if it is not connect to the resistor (it makes sense to me) i think it's wound on resistor because its core must be carbon. I asked my friends about it and they say it hasn't got value(henry) because you can not buy that value Then I'm gonna buy a resistor (i think its value doesn't change anything maybe important thing is its size, maybe itmust be 1w resistor size) and wound 0.5mm wire on it and try it. But i will do it one week later because i have exams. Thank you very much audiguruyou are very helpfull (And sorry if there is wrong sentences English isn't my primitive language)