I'm looking to build a low power (within legal limits) RF power amplifier that will alow me to connect my signal generator (as the carrier wave):

LODESTAR LGA101A AUDIO SIGNAL GENERATOR

and a line-level audio input to make a simple AM transmitter.
Apparently I can just use an op amp, rather than a MOSFET because of the low frequencies involved?.

Can someone provide me with a circuit diagram and parts list?

Appreciated, thanks.

Signal Generator Specs:
Output Voltage :5V Rms or more
Output Distortion :400 Hz - 20KHz, 0.1% or Less
(100 range for 1KHz)
50Hz - 500KHz, 0.5% or Less
Output Flatness :±1.5dB (refer to 1KhZ)
Square Wave Characteristics
Output Voltage :10V p.p or more
Rise Time : 0.25 us or Less
Duty ratio :50%± 5% (refer to 1KHz)
External Synchronization Characteristics
Range ±3% of Oscillator Frequency
Input Impedance : 10K Approximate
Maximum Input :10V Rms
Output Characteristics
Impedance :600Ω ± 10%
Attenuator: 0dB,-20dB, -40dB in 3steps (accuracy ± 1dB at 600Ω Load)

 

A simple class-A common base amplifier can give you around 20 dB of gain over a wide frequency range. Good educational project.

Eric

 

How would I incorporate the two inputs (the carrier wave from the signal generator and the line-level audio input).

Thanks.

Are there any tutorials or reference materials that would be good for this.

I've googled, but I don't know which solution is most suitable.

Thanks.