FM Transmitter

Warning: This circuit provides an FM modulated signal with an output power of around 500mW. The input Mic preamp is built around a couple of 2N3904 transistors, audio gain limited by the 5k preset. The oscillator is a colpitts stage, frequency of osc

Posted at 10-05-13 by Sky views(2377)

1) Description This package contains the schematic and a PCB-layout for a FM oscillator using the BF900 Dual Gate Mosfet, and can be used between 90 and 110 MHz. Specific things about this oscillator is that it has very low noise, and it is very stab

Posted at 10-05-13 by Sky views(3251)

A nice AC mains powered transmitter with pre-emphasis, audio level control, and tuning control. Notice: Before operating a radio transmitter, find out what kind of transmitter operation, if any, is permitted in your locality. Radio transmitter oper

Posted at 10-05-13 by Sky views(6731)

This part II is the hart of the transmitter project. This part II will explain the PLL unit and the VCO (Voltage Controlled Oscillator) which will create the FM modulated RF signal up to 400mW. All contribution to this page are most welcome! Ba

Posted at 10-05-13 by Sky views(34666)

Notice: Before operating a radio transmitter, find out what kind of transmitter operation, if any, is permitted in your locality. Radio transmitter operation is a serious legal matter. In the United States, operation of unlicensed intentional radiato

Posted at 10-05-13 by Sky views(5751)

Introduction What this design is for To boost the output power of low power FM broadcast band exciters, a number of these are available commercially, both as kits and ready made. See How to be a Community Radio Station for links to reviews of some of

Posted at 10-05-13 by Sky views(17852)

This circuit will transmit a continuous audio tone on the FM broadcast band (88-108 MHz) which could used for remote control or security purposes. Circuit draws about 30 mA from a 6-9 volt battery and can be received to about 100 yards. A 555 timer i

Posted at 10-05-17 by Sky views(5334)

If you do not need antenna and would like a power supply with the unit, the price is 98usd total including shipping cost.

Posted at 12-01-31 by Sky views(1028)

Here is the schematic, PC board pattern, and parts placement for a low powered FM transmitter. The range of the transmitter when running at 9V is about 300 feet. Running it from 12V increases the range to about 400 feet. This transmitter should not b

Posted at 10-05-13 by Sky views(3840)

1) High-frequency transistors V1 and capacitor C3, C5, C6 to form a three-point oscillator capacitor 2) C4, L form a resonator: resonant frequency is the frequency of the FM microphone launch, according to the parameters of the diagram components tra

Posted at 10-04-13 by Sky views(11167)