Digital Trainer Using NAND Gates

A common anode seven segment module is fitted on a board with 8 bit dip switch to control the each segment of seven segment LED display. The inputs A-D of a display driver are connected to the binary coded decimal (BCD) outputs from a decade counter. A network of logic gates inside the display driver makes its outputs a-g become high or low as appropriate to light the required segments a-g of a seven segment display. A resistor is required in series with each segment to protect the LEDs

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Mounted on transparent covered box. Diagram provide with three different color four mm sockets for easy identification of terminals.

To study the AND digital logic gate and verification of the truth table.