FM 9V Transmitter Circuit

FM 9V Transmitter Circuit - VFO Adjustable

This FM transmitter circuit has to be one that breaks all the internet records. According to the counter on the website as of Aug. 2017 it has received 922,000 views with 418 comments. It appears that an entire forum has been built around this circuit. I had to add it here. Credit for this electronic fm transmitter circuit gos to Aaroncake.Net. I simply did all of the layouts for you. John
FM 9V Transmitter Circuit - VFO Adjustable - Stripboard
FM 9V Transmitter Circuit - VFO AdjustableFM 9V Transmitter Circuit - VFO Adjustable - Real Board ViewFM 9V Transmitter Circuit - VFO Adjustable - Screen Board ViewFM 9V Transmitter Circuit - VFO Adjustable - Circuit Board AFM 9V Transmitter Circuit - VFO Adjustable - Circuit Board B
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The range of this FM vfo adjustable transmitter circuit with a 9V battery is about 300 feet.

C1 .001uf
C2 5.6pf
C3,C4 10uf Electrolytic Capacitor
C5 3-18pf Adjustable Cap
R1 270 Ohm
R2,R5,R6 4.7k
R3 10k
R4 100k
Q1, Q2 2N2222A
MIC: Electret Microphone.

MISC: 9V Battery Snap, Wire For Antenna
L1 and L2 are 5 turns of 28 AWG enamel coated magnet wire wound with a inside diameter of about 4mm. The inside of a ballpoint pen works well (the plastic tube that holds the ink). Remove the form after winding then install the coil on the circuit board, being careful not to bend it. C5 is used for tuning. This fm transmitter circuit operates in the normal broadcast frequencies (88-108MHz). Q1 and Q2 can also be a 2N3904 or something similar.

FM 9V Transmitter Circuit - VFO Adjustable - Breadboard
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