How to Design Customized 220V SMPS Circuits We many times think that how we can make a SMPS circuit, and we feel that this is very complex. But that is not so because we can do this by following simple manual calculations step by step. We only need to know that SMPS design is always starting from the transformer. We cannot make flyback type design until we decide transformer turns, duty cycle, and inductance. 220V SMPS Designing Procedures So here we will learn in a very clear step by step way h