FM Transmitter | Electronic Project Circuits

Posts Tagged ‘FM transmitter’

FM surveillance BuG Transmitter using 2N2222

The Circuit shown can transmit voice to exceptionally good range. Tune trimmer to hear the signal to your near radio. Frequency range is 88-108 MHz. Max current consumption is 30mA. You can power the bug with a 9Volt Battery, or you can plug a power supply to feed in 9-12 Volts. That bug will pick even a low whisper or even the sound of a breath well far from the microphone. Great spy equipment.

Be the first to comment - What do you think? Posted by admin - November 7, 2008 at 5:18 am

Categories: FM transmitter, RF-Radio Frequency Tags: 2n2222 fm transmitter circuit, FM transmitter

Telephone Listening Bug with FM Transmitter by A933

Here is a simple transmitter that when connected to a phone line, will transmit anything on that line (execpt the dial tone) to any FM radio. The frequency can be tuned from 88 to about 94Mhz and the range is about 200 feet. It is extremely easy to build and is therefore a good, useful beginner project.

1.5W 1-2 km Range FM Transmitter by 2N2219

This is a well designed basic FM transmitter that you can easily recive the signals transmitted from this transmitter in a 1-2km range with using a normal FM reciever. Another property of this circuit is that the bobin is placed on the printed circuit board. The input sound’s amplitude can be adjusted by using the P1 potentiometer.

Parts List:
R1=220K,R2=4.7K,R3-R4=10K,R5=100ohm,C1,C2 = 4.7uF electrolytic, C3-C4=1nF
C5=2-15pF,C6=3.3pF,Q1=BC547C, Q2=2N2219A, P1=25K, MIC=ecm series

Source:http://www.circuit-projects.com/15-watt-1-2-km-range-fm-transmitter.html