PC Board Pattern Of FM Transmitter

FM Transmitter Here is the schematic, PC consideration shape, and talents arrival for a low powered FM transmitter. The dispose of the transmitter when general at 9V is encircling 300 feet. General it from 12V increases the dispose to encircling 400 feet. This transmitter should not be used as a locality or telephone 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 Battery Snap, PC Board, Wire For Antenna  - L1 and L2 are 5 turns of 28 AWG enamel coated magnet wire irritate delay an internally bisection of encircling 4mm. The internally of a ballpoint pen works well-mannered-mannered (the tractile tube that holds the ink). Remove the make following tortuous then inaugurate the implication on the tour consideration, life cautious not to direct it. C5 is used for tuning. This transmitter operates on the ordinary unsparingly frequencies (88-108MHz). Q1 and Q2 can as-well be 2N3904 or bigwig correspondent. You can use 1/4 W resistors mounted vertically instead of 1/8 W resistors. You may failure to bypass the battery delay a. 01uf capacitor. An antenna may not be required for production.