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- 09:03, 11 юни 2023 разл ист +6817 Н 9 Signs You're a سعر جهاز كشف المعادن في مصر Expert Нова страница: „The purpose of this article is to outline the principles and differences of the electronic circuitry between various types of metal detectors. Probably the simplest and oldest style of metal detector is that of the Beat-frequency oscillator or BFO for short. The BFO is one of the oldest designs of detector. In its simplest the unit uses two radio frequency oscillators tuned very close together around the 5 kHz mark. The first of these oscillators is usu...“ текуща