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AM Transmitter Circuits
Last Updated on: Tuesday, May 26, 2015 07:20 AM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

1 Watt AM transmitter for the 10 meter band (28MHz) -  In this project, you will make a simple 3-stage low-power broadcast-type circuit, using a crystal oscillator integrated circuit and an a collector modulated AM oscillator with amplifier. You can connect the circuit to the an electred microphone or amplified dynamic microphone. Using an electred microphone is shown (in gray) in the diagram below. (no amplified dynamic microphone has a to low output voltage to work. at least 100mv is needed). You could also add a LF preamp stage of one transistor to allow connecting a dynamic microphone directly. You'll see that you can receive the signal through the air with almost any AM radio receiver. Although the circuits used in radio stations for AM receiving are far more complicated, this nevertheless gives a basic idea of the concept behind a principle transmitter. Plus it is a lot of fun when you actually have it working!  Remember that transmitting on the 10 meter band you'll need a valid radioamateur license!!. . .  [by Guy Roels ON6MU]

500mW AM transmitter for the 20 meter band (14MHz) -  In this project, you will make a simple low-power broadcast-type circuit, using a crystal oscillator integrated circuit and an a collector modulated AM oscillator. You can connect the circuit to the an electrec microphone (pointed out in gray on the diagram) or amplified dynamic microphone (no amplified microphone has a to low output voltage to work. Approx. 100mv is needed). You could also add a LF preamp stage of one transistor to allow connecting a dynamic microphone directly. . . .  [by Guy Roels ON6MU]

AM DSB Transmitter for Hams -  circuit diagram of simple double side band suppressed carrier (DSBSC) transmitter for hams. Circuit uses crystal oscillator, crystal can be switched for multi band operation. . .  

AM Transmitter -  The circuit is in two halfs, an audio amplifier and an RF oscillator. The oscillator is built around Q1 and associated components. The tank circuit L1 and VC1 is tunable from about 500kHz to 1600KHz. . . .  [Andy Collison]

Automicro TM02 high power transmitter module schematic -  . . .  [Peter Jakab, Electrical Engineer, Engineer of Informatics]

Cardboard AM Radio Resonant Loop Passive Booster Antenna -  An excellent use for copper wire, a trimmer capacitor and some lovely cardboard. . . .  [Henry (last name not given)]

Low-Range AM Radio Transmitter -  Here is a simple radio transmitter for transmission up to 25 metres. It is basically an AM modulator whose signal can be received on the normal AM radio. It can also be used as an AM radio tester. . . .  [ EFY Enterprises Pvt. Ltd. All rights reserved.]

Micro Power AM Broadcast Transmitter -  In this circuit, a 74HC14 hex Schmitt trigger inverter is used as a square wave oscillator to drive a small signal transistor in a Class C amplifier configuration. The oscillator frequency can be either fixed by a crystal or made adjustable (VFO) with a capacitor/resistor combination. . .  [Bill Bowden]

One Watt AM transmitter for the 10 meter band (28MHz) -  In this project, you will make a simple 3-stage low-power broadcast-type circuit, using a crystal oscillator integrated circuit and an a collector modulated AM oscillator with amplifier. You can connect the circuit to the an electred microphone or amplified dynamic microphone. Using an electred microphone is shown (in gray) in the diagram below. (no amplified dynamic microphone has a to low output voltage to work. at least 100mv is needed). You could also add a LF preamp stage of one transistor to allow connecting a dynamic microphone directly. You'll see that you can receive the signal through the air with almost any AM radio receiver. Although the circuits used in radio stations for AM receiving are far more complicated, this nevertheless gives a basic idea of the concept behind a principle transmitter. Plus it is a lot of fun when you actually have it working!  Remember that transmitting on the 10 meter band you'll need a valid radioamateur license!!. . .  [by Guy Roels ON6MU]

Powerful AM Transmitter -  . . .  

SAW-based 434MHz transmitter schematic with RO2101 -  . . .  [Peter Jakab, Electrical Engineer, Engineer of Informatics]

SAW-based transmitter -  . . .  [Peter Jakab, Electrical Engineer, Engineer of Informatics]

SAWR-based transmitters -  . . .  [Peter Jakab, Electrical Engineer, Engineer of Informatics]


AM Transmitter Circuits



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