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حاليا اقوم بتركيب مشروع التخرج جهاز كاشف المعادن
http://www.bobsdata.com/metal_detector/index.html
ما هي قيمة الملفين التقريبية في هذه الدائرة؟
L1 Search Coil: This is composed of 22 turns of #28 enameled wire wound on a 6 
inch diameter form and then wrapped in tape…followed by a wrapping of aluminum foil as a shield. The aluminum foil should only go around about 355 degrees and should not again touch itself. This would produce an rf short. Now wrap about 8 inches of tinned #20 wire around one end of the aluminum foil and connect this to one end of the coil. This connection will go to point “A” on the pc board, the other end of the coil goes to point “B”.
The local oscillator coil, L2, consists of 291 turns of #32 enameled wire wound on a inch diameter ceramic, adjustable ferrite slug, coil form and then coated with epoxy adhesive. This connects to points C and D on the PC board.
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ما هي قيمة الملفين في هذه الدائرة؟
