Detector de metais BFO bom barato de se construir e simples.

Resistors:

•R1, R3, R5, R7: 22kΩ resistors

•R2, R6: 1kΩ resistors

•R4, R9, R12: 15kΩ resistors

•R8, R10, R11: 47kΩ resistors

•R13: 2.2kΩ resistor

•R14: 1MΩ resistor

•R15: 8.2kΩ resistor

•R16: 680Ω resistor

•R17: 10Ω resistor

•P1: 10kΩ lin. potentiometer (Tune)

•P2: 10kΩ log. potentiometer (Volume)

Capacitors:


•C1, C6, C7, C12, C14: 100nF capacitors

•C2, C8: 22nF low temp. coef. capacitors

•C3, C9: 2.2nF low temp. coef. capacitors

•C4, C10: 10pF ceramic capacitors

•C5, C11: 4.7uF/16V electrolytic

•C13: 10nF capacitor

•C15: 47nF capacitor

•C16, C17: 220uF/16V electrolytic

Bobina,choque de RF,etc...
•L1: 10cm DE DIAMETRO, 20 VOLTAS,DE FIO AWG 22


•L1: 82uH inductor ou choque de RF

•SW1: CHAVE SIMPLES DE LIGA E DESLIGA

•J1:JACK PARA FONE DE OUVIDO MONO

•D1: DIODO = NTE618 silicon varactor diode (20-440pF)


•Q1-Q4:TRANSISTORES 2N2222 NPN silicon transistors

•Q5: 2N5951 JFET transistor

•CI1: LM386 (Audio amplifier)
 
DICA : TODOS OS COMPONENTES PODEM SER TIRADOS DE SUCATA