LL4901 is a 200 ohm : 5 k microphone input transformer, winding turns ratio 1+1:10. The LL4901 is discontinued and no data sheet is available.
For replacements, please study LL1538.
Pin configuration (transformer seen from component side with label readable)
4, 3, 2, 1
LL4901
8, 7, 6, 5
LL4901 Usage (1:5)
in+ pin 1
in- pin 4
connect pis 2 + 3
out+ pin 6
out- pin 7
ground pin 5
