FM Transmitter

FM Transmitter Here is the schematic, PC lath pattern, and genitalia adjustment for a low powered FM transmitter. The ambit of the transmitter back active at 9V is about 300 feet. Active it from 12V increases the ambit to about 400 feet. This transmitter should not be acclimated as a allowance or blast bug. Part Total Qty. Description Substitutions C1 1 0.001uf Disc Capacitor  - C2 1 5.6pf Disc Capacitor  - C3,C4 2 10uf Electrolytic Capacitor  - C5 1 3-18pf Adjustable Cap  - R1 1 270 Ohm 1/8W Resistor 270 Ohm 1/4W Resistor R2,R5,R6 3 4.7k 1/8W Resistor 4.7K 1/4W Resistor R3 1 10k 1/8W Resistor 10K 1/4W Resistor R4 1 100k 1/8W Resistor 100K 1/4W Resistor Q1, Q2 2 2N2222A NPN Transistor 2N3904, NTE123A L1, L2 2 5 Turn Air Core Coil  - MIC 1 Electret Microphone  - MISC 1 9V Array Snap, PC Board, Wire For Antenna  - L1 and L2 are 5 turns of 28 AWG apply coated allurement wire anguish with an central bore of about 4mm. The central of a ballpoint pen works able-bodied (the artificial tube that holds the ink). Remove the anatomy afterwards ambagious again install the braid on the ambit board, actuality accurate not to angle it. C5 is acclimated for tuning. This transmitter operates on the accustomed advertisement frequencies (88-108MHz). Q1 and Q2 can additionally be 2N3904 or article similar. You can use 1/4 W resistors army angular instead of 1/8 W resistors. You may appetite to bypass the array with a. 01uf capacitor. An antenna may not be appropriate for operation.

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