The ornamental design for a transformer for electroniccircuit, as shown and described.
FIG. 1 is a bottom perspective view of a transformer for electronic circuit showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a left side view thereof; and,
FIG. 7 is a right side view thereof.
The broken lines which define the bounds of the claimed design form no part thereof. The broken lines shown represent unclaimed subject matter and form no part of the claimed design.