PC FM radio

  
Stabilised tendency of catering: Vcc=9~12V. Frequency of reception: 88~108MHz. Consumption: 100mA. 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.
PC FM radio - schematic

With the P1 we regulate the intensity of sound. With the P2 we regulate the frequency of reception. 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. Parts: 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.



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