strahd_von_zarovich
Advanced Member level 4
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.
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.
