# automatic gain control

1. ### TOP209P power integration IC

Hello everyone Please can someone tell me if this IC ( TOP209P ) is the same AS this one ( TYNY275PN) Is it doing the same functions? Can I replace the TOP209P with TYNY275PN ? THANK YOU SO MUCH
2. ### AGC with FET

hello, I have to build an automatic gain control using an FET and an Operational Amplifier, for a phototransistor (SFH314) so that when the signal of an IR LED is weak the AGC maintains the signal, and when the signal is strong reduces it, the gate of the FET I have to control it with the...