Electronic keyboard

An electronic keyboard comprising:

• A. a base,
• B. a flexible printed circuit positioned on the base, said circuit defining a plurality of spaced-apart electric switches arranged in one or more rows on the base, each switch remaining open until the printed circuit is depressed at the location of that switch,
• C. one or more similar spring strips positioned against the printed circuit, each said strip extending opposite a plurality of switches in each switch row on the base defined by the printed circuit, each spring strip comprising a lengthwise series of spring members each of which actuates an underlying switch in the underlying switch row when moved from a relaxed position to a stressed position and each spring strip in each row being separate from the spring strips extending along adjacent rows on the base,
• D. one or more similar key guide strips positioned opposite each row of spring strips, each key guide strip defining a lengthwise series of key guides for movably mounting keys opposite underlying spring members,
• E. means for mounting each key guide strip separately to the base so as to fix the positions relative to the base of the key guide strips and the spring strips and printed circuit portions in each row on the base, and
• F. similar keys movably mounted in the key guide strips so as to engage underlying spring members, each said key being supported in a first position by the engaged spring member when that member is in its relaxed position, said key being movable to a second position so as to move the engaged spring member to its said stressed position, said spring strips, key guide strips and keys being interchangeably positionable on and mountable to any of the switch rows on said base.