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			 The ornamental design for an impedance adapter for electronic circuitry, as shown and described.  | 
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FIG. 1 is a left side elevational view of an impedance adapter for electronic circuitry showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a right side elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc | 
| Jan 26 1989 | BLACKBURN, RICHARD | MUX LAB INC | ASSIGNMENT OF ASSIGNORS INTEREST | 005203 | /0935 | |
| Apr 17 1989 | Mux Lab Inc. | (assignment on the face of the patent) | / | 
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