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In this regard, there are two very common types of power supply, the linear and the switched mode. The main difference between the two is the way they operate.Linear power supplies provide a constant voltage at all times while the power provided by a switched mode power supply constantly varies. linear power supply is often used because of its simplicity. Linear regulators exist in packaged ICs that only need a rectified voltage source to operate. In comparison, a switched mode power supply is very complex and requires a handful of ICs as well as inductors.
The difference between a 2 wire and a 4 wire is the power supply.A 4 wire has 2 wires for power supply and 2 for the control signal. A 2 wire is a 4/20ma transmitter that uses the leakage current thru the load to power the transmitter.IE a 2 wire prox, versus a 3 wire prox.he signal will of course always vary between 4 and 20mA, but not the power wires. The big difference is that a 2-wire transmitter have a higher minimum voltage drop (typically 10V) than the 4-wire transmitter. That means there are more voltage drop availiable for the wire.