This is a simple low-power inverter that can convert 12V DC to 230-250V AC. It can be used to power lighter loads, such as car window chargers and night lights. The circuit is constructed based on only two ICs, namely IC CD4047 and IC ULN2004. So the standard meaning of circuit diagram is a graphical representation of an electrical circuit that employs either simple representations of parts or industry standard symbols. The use of symbols is determined by the audience that is examining the graphic. The visual circuit diagram would be utilized for a more general, non-technical audience.