There are mainly three types of logic gate named AND, OR and NOT gate. And every gate does its own different logic function. So with the help of these basic logic gates, we can get any logical functions or any Boolean or else any logical expression.

A universal gate is such a gate that we can implement any Boolean function, no matter how complex, using a circuit that consists of only that particular universal gate. The NAND & NOR gates are the most commonly encountered universal gates in digital logic.

In this article, we will take a look at how to convert any circuit into a circuit that consists only of NAND gates. Since the NAND gate is a universal gate, we can convert any circuit into a circuit consisting only of NAND gates. We first start by showing how other gates(AND, OR, Inverter) can be implemented using only NAND gates, then we use this knowledge to discuss how to convert any circuit into only a NAND circuit.