Am Transmitter Circuit Diagram

Power the circuit using a 9v battery for noise free operation.

Am transmitter circuit diagram. This is the simple and low cost am transmitter schematic diagram built using transistor bc109c. Our transmitter will need these parts. The tank circuit l1 and vc1 is tunable from about 500khz to 1600khz. It is illegal to operate a radio transmitter without a license in most countries.

Circuit description the heart of this circuit is a fet bfw10 t1 which works as a feedback oscillator. The frequency of the rf signal can be determined by the oscillator coil l1 and variable capacitor vc1. The oscillator is built around q1 and associated components. The frequency trimming can be done with vc2.

In figure 1 there are three radio stations each broadcasting at a different wavelength each station is broadcasting a radio signal consisting of a carrier wave and an audio signal. This ircuit is deliberately limited in power output but will provide amplitude modulation am of voice over the medium wave band. Here is a low cost good stability rf am transmitter which uses only one fet. In practise about 3 milliwatts into.

The circuit is in two halfs an audio amplifier and an rf oscillator. Radio receiver working principle. Use a 30 cm long insulated copper wire as the antenna. Am transmitter circuit diagram.

Am transmitter block diagram the transmitter s output amplifier circuit is shown in figure 1. The amplifier circuit consists of two of the mallory circuits connected in a push pull configuration with a coupling transformer acting as both. There are many suppliers such as an audio transformer this is a 1000 ohm to 8 ohm audio transformer such as radio shack 273 1380. This low cost am transmitter is tunable from 10 to 15 mhz with the help of j gang condenser vc1 which determines the carrier frequency of the amplitude modulation transmitter in conjunction with inductor l1.

These components can be used from an old mw radio if available. Use a 200uh inductor for the l1 in the tank circuit. The transmission frequency can be adjusted using the variable capacitance c3. The first circuit is the muntz version of a common one tube transmitter using a 12be6 pentagrid converter a k a.

The circuit is in two halfs an audio amplifier and an rf oscillator. Station 1 is broadcasting at am 920 station 2 at am 1460 and station 3 at am 1040. This marvel of engineering is at the same time an oscillator mixer and amplifier all in one valve structure. A one megahertz crystal oscillator this is a crystal clock oscillator such as those used in computers.

The circuit is in two halfs an audio amplifier and.