Imperial Special PCB Design
Here is a photograph of the IMPERIAL SPECIAL printed circuit board (PCB), and the components involved in the dc-dc power supply circuitry. It is a very simple circuit because the main IC has built-in display driver circuitry.
Track Side
This photograph shows the artwork and etching of the PCB. I thought it was designed well considering how old this calculator is.
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Imperial Special Calculator
Inside Imperial Special Calculator
Imperial Special PCB Design
Sharp LI2006 Voltage Levels
Imperial Special Calculator Display
Imperial Special Calculator Battery
Imperial Special Calculator Case