Optic Power Meter Repair

Status
Not open for further replies.
S

strahd_von_zarovich

Advanced Member level 4
Joined
Sep 25, 2015
Messages
119
Helped
1
Reputation
2
Reaction score
3
Trophy points
1,298
Activity points
2,475
Hi everyone,

I am trying to repair my optic power meter. However, I couldn't find the exact IC which is damaged. I am %95 sure It is a TIA. I coulnd't find it's feedback resistor, so probably the gain resistor is inside the chip. Also, there are digital switching ICs on the board, so I think they use different gains for different optic powers, and they do this using digital signals to choose different feedback resistors. Looks like pin-4 and pin-7 are the power pins, because of the decoupling caps, and pin-1 is the -Input pin because it is connected to the diode connection.

Here is the picture of the IC:



Thanks in advance.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…