Am Radio Transmitter Circuit Diagram

Low range am radio transmitter circuit diagram.

Am radio transmitter circuit diagram. This signal is called the carrier wave. Following the action in figure 6 the oscillator creates an ac sine wave at the desired frequency. It is illegal to operate a radio transmitter without a license in most countries. The oscillator is built around q1 and associated components.

The circuit is in two halfs an audio amplifier and an rf oscillator. This is the simple and low cost am transmitter schematic diagram built using transistor bc109c. This frequency can be changed by simply replacing r2 with a variable resistor or c1 with gang capacitors. The tank circuit l1 and vc1 is tunable from about 500khz to 1600khz.

This am radio transmitter can transmit audio sound to your backyard. The transmitter legally operates with micro power and will not set any distance records but unlike simpler designs the frequency stays put and the fidelity is excellent. All general purpose transistors should work in this circuit you can use bc549 transistors for this circuit. The tank circuit l1 and vc1 is tunable from about 500khz to 1600khz.

The audio output from condenser mic is preamplified by transistor t3 bc548. A simple am transmitter circuit with diagram and schematic. A block diagram representing various stages of a basic continuous wave radio transmitter. The circuit is in two halfs an audio amplifier and an rf oscillator.

It is similar in principle to the zn414 radio. A condenser microphone is used for speaking. This is the circuit diagram of mini am radio receiver. This circuit is deliberately limited in power output but will provide amplitude modulation am of voice over the range 500khz to 1600khz with values shown.

The circuit is in two halfs an audio amplifier and an rf oscillator. Although the schematic looks somewhat complex the. Where resistors r1 and r2 are in ohms capacitor c1 is in microfarads and frequency f is in hertz. The oscillator is built around q1 and associated components.

The picture to the left is a high quality radio transmitter for the a m. These components can be used from an old mw radio if available. Notes it is illegal to operatea radio transmitter without a license in most countries. Follows fcc regulations and still produces enough amplitude modulation.

The circuit use a compact three transistor regenerative receiver with fixed feedback. Original am micropower transmitter. The audio output from t3 is further amplified by transistor t2 bd139 which modulates the rf amplifier built around transistor t1 by varying the current through it in accordance with the audio signal. This is the simple and low cost am transmitter schematic diagram built using transistor bc109c.

The carrier wave is then amplified by the radio frequency rf power amplifier to the desired output wattage.