I am in need of a 1:1 transformer so I desoldered some from an old computer PSU. Now I want to identify and measure them.

Transformer 1 (top left)

Markings:

• (top) EEL-16-2005
• (bottom) EE-16-2005
  • EE: Core is shaped in the form 'EE'.
  • 16: The size in millimeters of the outer shell.
  • 2005: Production year.
• YH 0743
  • YH: Brand abbreviation (which exactly is unclear)

Transformer 2 (bottom left)

Markings:

• (top) EEL-19-2005
• (bottom) EE-19D-2005
  • EE: Core is shaped in the form 'EE'.
  • 19: The size in millimeters of the outer shell.
  • 2005: Production year.
• LIV0750G
  • LIV: Company 'Yangzhou Liv Transformer Co., Ltd'

Transformer 3 (white)

Markings:

• ZLF1250CD00

• EE-25-1

  • EE: Core is shaped form 'EE'.

• LIV 0801 G

  • LIV: Company 'Yangzhou Liv Transformer Co., Ltd'.

Transformer 3 (round)

Markings: None