Tuesday, June 27, 2017

Circuit Diagram FM Transmitter Without Coil Using Varicap Diode

Robotronicdiagram. - This is circuit diagram of FM Transmitter Without Coil Using Varicap Diode like in Figure 1 below. The main component in this circuit diagram is varicap diode and also CD4049 IC. 

In here we will show you also the component parts used and the simple description of this circuit diagram and the last we will give you link to read more about this circuit from original source. 

Circuit Diagram 

Component Part
  1. R1_________________6.8K
  2. R2_____________10K
  3. R3_____________1K
  4. R4_____________1M
  5. R5_____________100K
  6. R6_____________1.5M
  7. Capacitors
  8. C1, C3__________0.1uF 50V Polyester capacitors
  9. C2_____________10uF 25V Electrolytic capacitors
  10. C4_____________100pF 50V Polyester capacitors
  11. C5_____________100uF 16V Electrolytic capacitors
  12. C6_____________22pF 50V polyester capacitors
  13. C7_____________0.001 uF 50V polyester capacitors
  14. Semiconductors
  15. IC1____________CD4069
  16. D1____________ Varicap diode
  17. Others
  18. Condenser Micro phone
  19. Ceramic crystal filter 10.7 MHz

Circuit diagram like in figure 1 above is Circuit Diagram FM Transmitter Without Coil Using Varicap Diode. According Eleccircuits site describe that in Figure 1 is RF oscillator circuit which use a inverter IC1/2 and ceramic crystal filter 10.7 MHz to use drive IC1/4 – IC1/6 by through IC1/3.

When inverter in parallel form this impedance output is low thus they can drive directly an antenna.

When output of IC1/4 – IC1/6 are square wave which have much more internal harmonic. The harmonic number 9 of frequency 10.7 MHz (96.3 MHz) will take place at the center of the FM band.

The IC1/1 is audio amplifier which signal from the the micro phone will be amplified and will send to varicap diode. This signal causes the capacitance of the varicap diode changed and make also oscillator frequency changes. Thus its occurs modulation frequency.

Please read more this article from original source about circuit diagram of FM Transmitter Without Coil Using Varicap Diode using link Here.

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