Radio Circuit. - This is one of implementation of varicap diode and CD4069 IC to build radio generator or oscillator system. It is only need small component completed to build this electronic circuit that basically component.
The electronic design circuit of FM Transmitter Circuit Using CD4069 and Varicap Diode Without Coil is look like in Figure 1 below. Other component used like resistors, capacitors, and Ceramic crystal filter 10.7 MHz.
The electronic design circuit of FM Transmitter Circuit Using CD4069 and Varicap Diode Without Coil is look like in Figure 1 below. Other component used like resistors, capacitors, and Ceramic crystal filter 10.7 MHz.
Beside we will show you electronic design circuit and component parts need, we also will give you global description about this circuit. So, please enjoy to continue reading this article until finish and get more useful.
Electronic Circuit Design
Component Parts
- R1_____________6.8K
- R2_____________10K
- R3_____________1K
- R4_____________1M
- R5_____________100K
- R6_____________1.5M
- Capacitors
- C1, C3__________0.1uF 50V Polyester capacitors
- C2_____________10uF 25V Electrolytic capacitors
- C4_____________100pF 50V Polyester capacitors
- C5_____________100uF 16V Electrolytic capacitors
- C6_____________22pF 50V polyester capacitors
- C7_____________0.001 uF 50V polyester capacitors
- Semiconductors
- IC1____________CD4069
- D1____________ Varicap diode
- Others
- Condenser Micro phone
- Ceramic crystal filter 10.7 MHz
Description
The electronic circuit design like in Figure 1 above show you radio transmitter oscillator circuit using varicap diode and CD4069. Other component need also that can supply with low voltage DC +9V and ground source to charge this IC and all system component from power supply built. With this electronic design circuit you can produce FM transmitter generator that useful now.
According Eleccircuits blog mentioned that in Figure 1 above 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.
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.
