Hello,
This is the schematic and PCB layout I designed based on the LM4950.
I use a jumper cap to select whether the output is connected to resistor R14 or the headphones. My headphones are TDH39 with an impedance of 10 ohms.
When I connect the jumper cap to the resistor, the output signal is normal:
However, when connected to the headphones, the waveform becomes very strange:
My headphones are not damaged. What could be causing this issue, and how should I address it?
The resistors R12 and R13 in the schematic are voltage dividers intended to reduce the headphone's background noise. Even if I remove R12 and R13 and connect the output directly to either the headphones or resistor R14, the waveform remains the same: distorted on the headphones, but normal on the resistor.
