Schematics > RF circuit > FM radio
FM radioTECHNICAL CHARACTERISTICS:
Stabilised tendency of catering: Vcc=9~12V
Frequency of reception: 88~108MHz
Consumption: 100mA
Materially:
The resistances are 1/4W.
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R1
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47K
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R2
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22K
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R3
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100K
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R4
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39K
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R5
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10
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R6-r12
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7,5K - Optionally
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R13-r21
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15K - Optionally
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P1
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10K Logarithmic potentiometer
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P2
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100K Linear potentiometer
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C1
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39pF Ceramic
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C2
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47pF Ceramic
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C3
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2,2nF Polyester
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C4, c14
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220nF Polyester
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C5
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22nF Polyester
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C6
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10nF Polyester
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C7, c18
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180pF Ceramic
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C8
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150pF Ceramic
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C9
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100nF Polyester
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C10, c13
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330pF Ceramic
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C11
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220pF Ceramic
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C12, c16
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3300pF Ceramic
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C15, c17
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1800pF Ceramic
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C19, c21, c22
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10mF/16V electrolytic
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C20
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10nF Polyester
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C23
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47nF Polyester
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C24, c25
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470mF/16V electrolytic
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L1, l2
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5 Coils linked with internal diameter 4mm from cupreous isolated
wire 0,6mm.
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IC1
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TDA7000 with base DIL18
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IC2
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LM7805
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IC3
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LM386 with base DIL 8
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D1
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BB329 or BB105 or other than old tuner televisions.
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SPEAKER
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Loudspeaker 8W/1W.
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S1
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Switch of catering.
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AERIAL
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50cm isolated wire
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CONNECTOR DB25
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Fastener of 25 pin parallel door PC (LPT) -Optional
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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 planning as C ++, PASCAL, VISUAL
BASIC, DELPHI etc you can write some 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.)
Note:
Exists a simple program in DOS which I can to you him send in
order to experiment. [kkontak@hotmail.com].
Also check the conversation about this project at the community. Post you questions
here.
Title: FM radio
Source: www.electronics-lab.com
Published on: 2005-02-03
Reads: 1368
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