[SOLVED] [Help] AM Modulation AD633

[darrylcapulla]

I want to create a simple transmitter using AD633, the problem is need to connect the input to a microphone or mp3 player.
what pre amp circuit should i use, will LM386 with gain of 200 from the datasheet work?
I'm currently using a function generator as a carrier input signal.

Transmission range is not important.

 

[BradtheRad]

An mp3 source may have sufficient amplitude without a pre-amp.

For a mic pre-amp, look at a transistor. Output can be 1V or more, depending on gain.



The 5uF capacitor blocks DC to the mic. Its value is chosen to pass low frequencies. (The sweep goes down to 30 Hz.) If you use an electret, there is a chance you won't need the capacitor.