Audio Fm Transmitter | Electronic Project Circuits

Posts Tagged ‘audio fm transmitter’

House fm transmitter 88-108MHz at 4 Watt

This is Fm transmitter circuit for house. It is modulation type Mono FM and Frequency range 88-108 MHz. By it have Working voltage range 12-18 VDC and use current max at 450mA only. This circuit convenient for , because , have good small-sized. It is the ideal project for the beginner who wishes to get started in the fascinating world of FM broadcasting and wants a good basic circuit. This circuit use the transistor the important , be the number is 2N3553.

Be the first to comment - What do you think? Posted by admin - April 19, 2009 at 8:26 am

Categories: FM transmitter, RF-Radio Frequency Tags: audio fm transmitter, house fm transmitter

V7 VHF FM Transmitter by 2N3866

The circuit is identical to the V7 VHF FM Transmitter but with a few small additions. TR1 (BC547) is an inverted Hartley oscillator which based upon an inductor fabricated on the PCB. This makes it megga-stable, and setable anywhere in the VHF FM band (76MHz to 119MHz) and the BB105 varicap makes it voltage tuneable over about 8MHz of that band. The inductor has one tapping for feedback and a second to feed an optional prescaler. TR2 is a buffer/amplifier and TR3 it the PA stage.

Read More Source:http://www.next.gr/rf/fm-transmitters/index3.html
Thank you.

Be the first to comment - What do you think? Posted by admin - January 22, 2008 at 9:48 am

Categories: FM transmitter, RF-Radio Frequency Tags: audio fm transmitter, FM transmitter, rf transmitters

FM Transmitter Circuit

This circuit is a simple two transistor (2N2222) fm transmitter
. No license is required for this transmitter according to FCC regulations regarding wireless microphones. If powered by a 9 volt battery and used with an antenna no longer than 12 inches, the transmitter will be within the FCC limits. The microphone is amplified by Q1. Q2, C5, and L1 form an oscillator that operates in the 80 to 130 MHz range. The oscillator is voltage controlled, so it is modulated by the audio signal that is applied to the base of Q2. R6 limits the input to the RF section, and it’s value can be adjusted as necessary to limit the volume of the input. L1 and C6 can be made with wire and a pencil. The inductor (L1) is made by winding two pieces of 24 gauge insulated wire, laid side by side, around a pencil six times. Remove the coil you have formed and unscrew the two coils apart from each other. One of these coils (the better looking of the two) will be used in the tank circuit, and the other can be used in the next one you build. The antenna (24 gauge wire) should be soldered to the coil you made, about 2 turns up from the bottom, on the transistor side, and should be 8-12 inches long. To make C6, take a 4 inch piece of 24 gauge insulated wire, bend it over double and, beginning 1/2″ from the open end, twist the wire as if you were forming a rope. When you have about 1″ of twisted wire, stop and cut the looped end off, leaving about 1/2″ of twisted wire (this forms the capacitor) and 1/2″ of untwisted wire for leads.