2 Watt FM Transmitter

The circuit is basically a radio frequency (RF) oscillator that operates around 100 MHz. Audio picked up andamplified by the electret microphone is fe

2 Watt FM Transmitter - Salam Electrical Engineer yang setia membaca artikel pada blog ini. Semoga tetap bersemangat untuk belajar dan terus belajar tentang elektronika.

Pada kesempatan kali ini saya akan berbagi tentang Rangkaian 2 Watt FM Transmitter. Gunakan fitur Translate di sebelah kanan untuk menterjemahkan teks berbahasa inggris, selamat membaca, semoga bermanfaat.

2 Watt FM Transmitter

The circuit is basically a radio frequency (RF) oscillator that operates around 100 MHz. Audio picked up andamplified by the electret microphone is fed into the audio amplifier stage built around the first transistor.

Outputfrom the collector is fed into the base of the second transistor where it modulates the resonant frequency of the tank circuit (L1 coil and the trimcap) by varying the junction capacitance of the transistor.

Junction capacitance is a function of the potential difference applied to the base of the transistor T2. The tank circuit is connected in a Hartley oscillator circuit.

Components List

R1=220K
R2=4.7K
R3,R4=10K
R5=100ohm
C1,C2=4.7uF Electrolytic
C3,C4=1nF
C5=2-15pF
C6=3.3pF
Q1=BC547C
Q2=BD135
P1=25K
MIC=Electret Condenser Type

P1 act as condenser microphone volume level. For FM, coil will be small. Use thin gauge enamel magnet wire. the diameter of coil will be a couple mm: use ink tube from pen to form, and try 8-12 turns. Small inductance coils make for much guess work.