behrendfry
New Member
I am reverse engineering a simple circuit that is used to keep liquid in a container at a constant temperature. There are 3 wires coming into the circuit from the main device, one is gnd and the other two wires each go to a 3-pin component that is labeled on the PCB as FL1 and FL2. These 3-pin components have 100V and M103 written on them. I am assuming they are some type of filte but I am not sure. I can provide the schematic if needed. Pin 1 of both components is connected tothose incoming wires (orange and brown). pin 2 is connected to pin 2 of the same other component and the pin 3 of both components wire to the Vcc of the Temp sensor, TC622 and route to the MOSFET. IRFD9120. Does anyone know what these 2 identical components are that are labeled FL1 and FL2 on the PCB?????