I have a circuit on PCB with a transformer that generates a lot of heat.
It is actually an energy meter, and I'm getting increasing error as time goes on. I observe that the transformer heats up considerably, and I was wondering if this can increase the noise in the circuit, and if so, by how much.
EDIT: I made some measurements on the power supply:
Input Ac voltage: 220VAC
Voltage at the transformer secondary (with bridge rectifier disconnected): 19VAC
Voltage at the transformer secondary (with bridge rectifier and the rest of the power supply connected): 9VAC
Current after bridge: 220mA
Current at the end of the power supply entering the main circuit (from the point where you see the +sign on the schematic): 10mA
Someone suggested I put a resistor after the bridge to limit the current, saying it was way too high. I need some input here please.
One more thing, can anyone tell me the function of 130Ω R7 resistor between the two capacitors just after the zener diode?