Question

(a) A student wants to use two p-n junction diodes to convert alternating current into direct current. Draw the labelled circuit diagram she would use and explain how it works.
(b) Give the truth table and circuit symbol for NAND gate.

Answer 1

a) Using two p-n junction diodes AC is converted to DC by creating a full wave rectifier.

Diagram is attached. In the first positive half cycle D1 is forward biased and current flows. In the negative half cycle D2 is forward biased and current flows.

b) NAND gate image is shown in the  attachment.

  Truth table is shown in 3rd attachment.