3d天天彩就业报

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              2. Free circuit diagrams


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                FM radio (may be used with PC)



                TECHNICAL CHARACTERISTICS:
                Stabilised tendency of catering: Vcc=9~12V
                Frequency of reception: 88~108MHz
                Consumption: 100mA

                Materially:
                [color=green]The resistances are 1/4W.[/color]
                R1 47K
                R2 22K
                R3 100K
                R4 39K
                R5 10
                R6-r12 7,5K - Optionally
                R13-r21 15K - Optionally
                P1 10K Logarithmic potentiometer
                P2 100K Linear potentiometer
                C1 39pF Ceramic
                C2 47pF Ceramic
                C3 2,2nF Polyester
                C4, c14 220nF Polyester
                C5 22nF Polyester
                C6 10nF Polyester
                C7, c18 180pF Ceramic
                C8 150pF Ceramic
                C9 100nF Polyester
                C10, c13 330pF Ceramic
                C11 220pF Ceramic
                C12, c16 3300pF Ceramic
                C15, c17 1800pF Ceramic
                C19, c21, c22 10mF/16V electrolytic
                C20 10nF Polyester
                C23 47nF Polyester
                C24, c25 470mF/16V electrolytic
                L1, l2 5 Coils linked with internal diameter 4mm from cupreous isolated wire 0,6mm.
                IC1 TDA7000 with base DIL18
                IC2 LM7805
                IC3 LM386 with base DIL 8
                D1 BB329 or BB105 or other than old tuner televisions.
                SPEAKER Loudspeaker 8W/1W.
                S1 Switch of catering.
                AERIAL 50cm isolated wire
                CONNECTOR DB25 Fastener of 25 pin parallel door PC (LPT) -Optional

                REGULATIONS:
                A) With the P1 we regulate the intensity of sound.
                B) With the P2 we regulate the frequency of reception.
                C) Optionally: If you want to check the frequency with your PC it will be supposed you make the following energies:
                - You assemble and the circuit that is in the blue frame.
                - You cut the driver dj'pla in point A, as it appears in the circuit and you connect points A,V.
                - If you know some language of programming as C ++, PASCAL, VISUAL BASIC, DELPHI etc you can write a program which will send in the parallel door (378 I) of PC a number from 0 until 255 checking thus the tendency of expense of simple D/A of converter (that it is in blue frame) and consequently and frequency of radio via passage VARICAP.
                (As long as grows the number that sends in the parallel door, so much minimizes the frequency that receives the radio.)

                Notes:
                Download DOS control program here .
                You can also try this one:

                author:Kyriakos Kontakos,
                website: http://www.electronics-lab.com



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