PC FM radio
#FM radio
#PC interface
#VARICAP
#frequency tuning
#parallel port
#D/A converter
#programmable
#88-108MHz
#stabilised power
Description: 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.
More: 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.
The described circuit functions as a stabilized FM radio receiver with adjustable sound intensity and frequency reception. The primary voltage supply for the circuit can range between 9V to 12V, ensuring compatibility with various power sources. The circuit operates within the FM frequency range of 88MHz to 108MHz and has a current consumption of approximately 100mA, allowing it to be powered by standard batteries or power adapters.
The TDA7000 integrated circuit (IC1) serves as the core FM receiver, designed for low-power applications. It is responsible for demodulating the FM signals received by the aerial, which is a 50cm length of insulated wire. The output audio is amplified by the LM386 (IC3), which drives an 8W loudspeaker, providing sufficient sound output for general listening.
Two potentiometers (P1 and P2) are included for user interaction. P1 is a logarithmic potentiometer used to adjust the audio intensity, while P2 is a linear potentiometer that allows for fine-tuning of the reception frequency. This feature enables the user to optimize the reception based on local broadcasting conditions.
The circuit also includes a digital-to-analog converter interface, which can be controlled via a parallel port (DB25 connector) of a PC. By sending numbers from 0 to 255 through the parallel port, the frequency reception can be adjusted through a varicap diode, effectively modulating the frequency of the radio signal based on the input value. This allows for a programmable approach to tuning the radio, which can be particularly useful for testing and development purposes.
Various resistors (R1 to R21) and capacitors (C1 to C25) are utilized throughout the circuit to set operational parameters, filter signals, and stabilize voltages. The LM7805 (IC2) is included to provide a regulated 5V supply for the circuit, ensuring consistent operation of the ICs.
Overall, the circuit is an integrated solution for FM reception with adjustable parameters, suitable for both hobbyist experimentation and practical applications in radio technology.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.
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.
More: 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.
The described circuit functions as a stabilized FM radio receiver with adjustable sound intensity and frequency reception. The primary voltage supply for the circuit can range between 9V to 12V, ensuring compatibility with various power sources. The circuit operates within the FM frequency range of 88MHz to 108MHz and has a current consumption of approximately 100mA, allowing it to be powered by standard batteries or power adapters.
The TDA7000 integrated circuit (IC1) serves as the core FM receiver, designed for low-power applications. It is responsible for demodulating the FM signals received by the aerial, which is a 50cm length of insulated wire. The output audio is amplified by the LM386 (IC3), which drives an 8W loudspeaker, providing sufficient sound output for general listening.
Two potentiometers (P1 and P2) are included for user interaction. P1 is a logarithmic potentiometer used to adjust the audio intensity, while P2 is a linear potentiometer that allows for fine-tuning of the reception frequency. This feature enables the user to optimize the reception based on local broadcasting conditions.
The circuit also includes a digital-to-analog converter interface, which can be controlled via a parallel port (DB25 connector) of a PC. By sending numbers from 0 to 255 through the parallel port, the frequency reception can be adjusted through a varicap diode, effectively modulating the frequency of the radio signal based on the input value. This allows for a programmable approach to tuning the radio, which can be particularly useful for testing and development purposes.
Various resistors (R1 to R21) and capacitors (C1 to C25) are utilized throughout the circuit to set operational parameters, filter signals, and stabilize voltages. The LM7805 (IC2) is included to provide a regulated 5V supply for the circuit, ensuring consistent operation of the ICs.
Overall, the circuit is an integrated solution for FM reception with adjustable parameters, suitable for both hobbyist experimentation and practical applications in radio technology.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.
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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