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74 DESIGN007 MAGAZINE I MARCH 2022 e term "flexible circuit" has been ensconced and accepted in electronic interconnection technology lexicon for several decades. In broad brush strokes the term has embraced every type of printed circuit produced on flexible base materi- als, regardless of the nature of the con- ductors used: metals, such as copper; or conductive inks, such as silver or other conductive particle filled polymers. e latter type of truly printed circuits, have, for many years, been referred to as "polymer thick film" circuits. eir predecessors were described in a Gov- ernment Printing Office booklet pub- lished in 1947, titled "Printed Circuit Techniques." ese circuits were easy and inexpensive to produce and were (and still are) commonly used to create membrane switch circuits for appliances and keyboards for every imaginable type of electronic product. Oen, simple compo- nents were attached to these poly- mer and metal powder circuits using conductive adhesives to add Flexible Circuits or Flexible Electronics? Flexible Thinking by Joe Fjelstad, VERDANT ELECTRONICS

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