Constructing a super heterodyne??

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74hc4066 mixer

Hello friends,
I am looking to construct an audio spectrum analyzer (bandwidth ≤ 20khz) using super heterodyne but I am not quite sure what part I should use, I am aware of mixer ICs on the market but their purpose are mainly focused for communication use. After reading the book Radio Frequency Integrated Circuit Design on mixers, I was wondering if it is possible to use an analog switch such as the CD4066 switching by a local oscillator as a mixer?
 

74hc4066 as amixer

Any thought on this approach people??
 

cd4066 heterodyne circuit

Yes, you can use 4066 or 74HC4066.
 


Hi Ahmad,
Would you be able to clarify why this is the case? I donno what's the difference between a CD4066 and a 74HC4066.

Thanks!
 

I had used both before (about 3 years ago) and the 74HC4066 was much stable, CD4066 was sensitive to human approach, and touch, however you can compansate it using some pull-down high resistors.
That's a practical notice!

and i hope it helps somehow!
Good Luck
Ahmad,
 

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