Expanded Keyboard for Calculator

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Expanded Keyboard For Calculator.

--- "DO IT YOURSELF" ENTRY ------- PURPOSE: Expanded keyboard allows person without fine motor control to operate calculator. Using the available circuitry of a commercial calculator, an enlarged keyboard is made, 16 by 18 inches. The keys are one inch in diameter, widely spaced and recessed. Slight pressure on the key activates switch. Display readout was enlarged to 1/2 inch symbols and located a the top of the keyboard. Includes drawing. SKILLS REQUIRED: Electronics, woodworking. AUTHOR: Caro

Parent Category: Office Equipment General
 
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