Casio SL-300ER Inside

Casio Euro Conversion SL-300ER has a nice clear liquid crystal display (LCD), which connects to the printed circuit board (PCB), with a ribbon cable. All the circuitry is inside the main calculator IC and consequently there are very few components on the PCB.

PCB

The other side of the PCB has the keyboard contacts, which saves much space and allows the calculator to be thin.

Diode

In solar panel charging circuits, a diode prevents the battery from draining through the solar panel. The diode blocks the current from flowing through the solar cell.

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