I guess you are right. It _IS_ confusing. If we assume a certain DC current, there are two ways to reach a desired core operating point: 1. With a given coil, adjust the core air-gap or 2. With a given core air-gap, adjust the number of turns on the coil The type number LL1660S/18mA is [...]
SR504A is a microphone transformer 200 ohm : 2k 1 2 3 4 SR504 5 6 7 8 SR504 /SR504A PCB Flying leads in+ 2 red in- 3 yellow out+ 6 green out- 7 grey core 1 housing 4 Faraday shield 5+8 black SR504a is similar to the more modern transformer LL1538
SR503 is a line output transformer with turns ratio 1.4 : 1. in+ 8 in- 6 out+ 10 out- 4
SR502 is a high impedance bridging input transformer. in+ 1 in- 5 in centertap 3 out+ 7 out- 9 Faraday shields 6+10
SR501 is a high level 600 ohm : 600 ohm isolation transformer. in+ 1 in- 5 out+ 7 out- 9 Faraday shields 6+10
LL9305 is a line output transformer with Faraday shields. Turns ratio 1+1 : 1.6 + 1.6 6 5 4 3 2 1 12 11 9 8 7 Usage (for 1:1.6 line output) in+ pin 6 in- pin 3 connect pin 4 + pin 1 out+ pin 12 out- pin 8 connect pin 7 + [...]
LL5801 is a 1+1 : 2 audio isolation transformer originally designed for Kungliga Dramatiska Teatern (Royal Theater) in Stockholm. Sorry, no data sheet. A modern replacemen is LL1527 or LL1588. LL5801 pinout and usage: Pin configuration (transformer seen from component side with label readable) 4, 3, 2, 1 LL5801 8, 7, 6, 5 (I am [...]
LL5606 is a line output transformer designed for Calrec Audio, probably used as a 1:1 transformer. LL5606 has an internal Faraday shield. Pin configuration (as seen from PIN side) 6, 5, 4, 3, 2, 1 12, 11, 9, 8, 7 Usage (2 : 1): in+ pin 1 in- pin 4 connect pin 6 + 3 [...]
LL5602 is a line output transformer designed for Calrec Audio, probably used as a stepup output transformer, turns ratio 1 : 1.6 or 1 : 3.2. Pin configuration (as seen from PIN side) 6, 5, 4, 3, 2, 1 12, 11, 9, 8, 7 Usage (1: 1.6): in+ pin 1 in- pin 4 connect pin [...]
LL5011 is a pin version of LL5008, normally used 1 : 1 Very low leakage inductance. Pin configuration (as seen from PIN side) 5, 4, 3, 2, 1 10, 9, 7, 6, Usage (1:1): in+ pin 1 in- pin 4 connect pin 2 + pin 5 out+ pin 10 out- pin 7 connect pin 9 [...]