Two Transistors FM Transmitter November 29, 2019 admin 0 This is a simple and small Two Transistors FM Transmitter. It is ideal for ready espionage for the strip from radio Fm or receiver of VHF. Of course, the recreational pu

Two Transistors FM Transmitter November 29, 2019 admin Electronics Projects, FM Transmitters 0 This is a simple and small Two Transistors FM Transmitter. It is ideal for ready espionage for the strip from radio Fm or receiver of VHF. Of course, the recreational purpose also exists and the children will adore having a transmitter that allows speaking for a radio FM placed at a distant place and like this pretend the secret agent. Operation of the Two Transistors FM Transmitter The voice/music captured by the electric microphone, your voice or close people’s chats, are mischievous to the base of the PNP transistor Q1 through C1 (10uF) where is amplified. The resistor R2 together with R3 it determines this amplification. After having amplified, the sign is removed from the collector of Q1 transistor and mischievous to the base of Q2 transistor (NPN), where it modulates in frequency the sign generated by this stage. This stage is an oscillator of high frequency that operates in the strip of FM. Your frequency is determined by L1 (0.3uH) and for the adjustment on the variable capacitor (CV). The obtained signs, already modulated in frequency, are mischievous to a linked antenna in the collector of the transistor Q2 (BC557 Transistor). The range of the transmitter depends on this antenna, of the feeding of the circuit, and of the place where it is operating. In the open field, with a 6 V battery and an antenna of about 40 cm of length, this range of this Tow Transistors FM Transmitter can be 1000 meters. With a smaller antenna, the range of this transistor will reduce. A common wall is not an obstacle for this transmitter. Circuit Diagram Components Transistors:Q1 – BC557Q2 – BF494MIC–microphone electret two terminals Resistors: (1/4 W, 5%)R1–4,7 KΩR2–220 KΩR3–22 KΩR4–10 KΩR5–6,8 KΩR6–47 Ω Capacitors:C1–10 µF/16 V – ELECTROLYTICC2–4,7 µF/16 V – ELECTROLYTICC3–10 nF – ceramicC4–4,7 pF – ceramicC5–100 nF – ceramicCV–trimmer from 3-30 to 5-50 pF Other Parts:L1 – 0.3uHB1 –3 to 9 VANT –antennaPrinted Circuit Board With Full Detail is given Below Full Discussion about this circuit you can freely discuss. Thanx a lot   FM TransmitterHow to build an FM transmitter circuitTwo Transistor FM Transmitter Be the first to comment Leave a Reply Cancel replyYour email address will not be published.CommentName * Email * Website Save my name, email, and website in this browser for the next time I comment.

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