Do-It-Yourself Assembly Powerful 9V FM Transmitter

If you want to assembly yourself a 9V FM transmitter which can transmit up to one mile to a good FM receiver, the following article might help you build your FM transmitter (FM Tx) DIY.  It is designed for low current operation, uses a sensitive microphone, and two stage audio amplifier, it can transmit at any frequency in the 88 to 108 MHz commercial FM band.

The circuit diagram above shows the detailed description of operation. What you need to prepare for this FM transmitter circuit project are:

1. R1,R10-10K Ohm 1/4W Resistor Brn-Blk-Orn
2. R2 100 K Ohm 1/4W Resistor (Brn-Blk-Yell)
3. R3,R8 15 k Ohm 1/4W Resistor (Brn-Grn-Orn)
4. R4,R9,R11 4.7 K Ohm 1/4W Resistor (Yel-Vio-Red)
5. RS 330 Ohm 1/4W Resistor (Orn-Orn-Brn)
6. R6 680 Ohm 1/4W Resistor (Blu-Gry-Brn)
7. R7 1 K Ohm 1/4W Resistor (Brn-Blk-Red)
8. R12 150 Ohm 1/4W Resistor (Brn-Grn-Brn)
9. C1,C3,C4,C8 .01 uF 50V Cer DiscCap (Marked .01 or 103)
10. C6,C7 27 pF 50V Cer Disc Cap (Marked 27)
11. C5 5-50pF Miniature Trim Cap (Green Marking)
12. C2 10 uF 16V Electrolytic Cap
13. Q1,Q2,Q3 PN2222, Silicone NPN Transistor
14. L 1 2.2 uH Inductor
15. L2 Air Wound Coil
16. Circuit board, battery snap, microphone and an antenna wire

Completed detail on Do-It-Yourself Assembly Powerful 9V FM Transmitter can be seen in pdf filetype (source: http://www.freeinfosociety.com/media/pdf/4365.pdf). Or you might interested in another electronic equipment DIY in this blog.