hi, I need to identify the components in the circuit. Its noise source, old and from china. In left corner it must be zener diode, next to it monolithic amplifiers. If you have experience with these, please let me know.thx

 

Hello,

Your box seems to be this one:
http://junying-mw.com/en/product_signal_nfl.html
The MMIC could be an MAR/MAV/ERA.
See the attached datasheet for an overview.
As the markings are removed, it is hard to tell wich one is used.

Bertus

 

That’s really pretty, what question do you have about it exactly? Are you trying to reverse engineer it? You can take the melf diode and check it in reverse bias, I would also guess Zener as the noise source.