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.
0.001uf Disc Capacitor
5.6pf Disc Capacitor
10uf Electrolytic Capacitor
3-18pf Adjustable Cap
270 Ohm 1/8W Resistor
270 Ohm 1/4W Resistor
4.7k 1/8W Resistor
4.7K 1/4W Resistor
10k 1/8W Resistor
10K 1/4W Resistor
100k 1/8W Resistor
100K 1/4W Resistor
2N2222A NPN Transistor
5 Turn Air Core Coil
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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