Digital Benchtop Power Supply Schematic

The main objective of the project is to learn how a linear power supply unit works in the beginning to explain the working principle of a linear power supply i have taken an example of lm 317 based power supply for making the final power supply i purchased a power supply kit from banggood and assembled it.

Digital benchtop power supply schematic.

I have had this circuit in use now for over 20 years and has never let me down and is one of the most. They range from linear purely analogue supplies with only voltage regulation to switching supplies. In the model described here a microcontroller monitors the actual and desired current and voltage settings there are many types of laboratory benchtop power supplies available from the very simple to the highly sophisticated. Power supply is based around a lm723 voltage regulator chip and has current limiting.

The power supply unit uses switching regulators to maintain a constant supply with good regulation and short circuit protection cause the unit to shutdown and be re powered immediately if something goes wrong. This variable power supply is using 7805 7809 7812 or 7815 voltage regulators where the last 2 digits desktop pc linear power supply circuit p. It s typically used by electrical engineers circuit designers and other professionals in similar lines of work. An old pc power supply unit makes an excellent and cheap bench top power supply for the electronics constructor.

I often end up with the power clips shorting out on the bench and with no problems.