How to implement a lock-in amplifier and balance line driver circuit?

[anandr05]

Hello,

I am super new to Multisim. I am looking to learn and understand how to implement( what components in Multisim) to use to implement the below circuit. Basically, I am ready a variable capacitance and trying to view the output.

Thanks a lot for any help and suggestions.

Anand

[tipa]

Вы это имеете в виду?https://cxem.net/sound/raznoe/balans_per.php