2020. 2. 9. 22:34ㆍ카테고리 없음
High Current Adjustable Power Supply Circuit using LM317 Gallery of Electronic Circuits and projects, providing lot of DIY circuit diagrams, Robotics & Microcontroller Projects, Electronic development tools. Figure 1 0-60 volt DC variable power supply circuits using LM317&LM337. How to make LM317 start at 0 volts. In electronic circuits require constant voltage. Would not be necessary to make the voltage at output of LM317T down to 0 volt. However, in the experiments will be necessary to adjust the the voltage.
Pictured above is the circuit diagram from an adjustable power supply. The two resistors used to set the output voltage from the LM317 are called R1 and R2. In this adjustable supply, R1 is fixed at 220 Ohms, and R2 is a 4k7 potentiometer which means that R2 has a range of 0-4,700 Ohms which can be selected by rotating the potentiometer.Using our it can be seen that if R1 = 220 and R2 = 0 the output voltage is 1.26V, and if R1 = 220 and R2 = 4700 the output voltage is 28V. These figures alone do not tell the full story though as the output voltage will always be 2-3 Volts lower than the input voltage. Therefore for example, if the input voltage is 15V the highest output voltage possible will be around 12-13V. High Current Power Supply with LM317T.
Power Supply Using Lm317 And Lm337 Together Youtube
The LM317T with correct heatsinking (see our article ) can output a maximum constant current of around 1.5 Amps. If you need more current, then the circuit has to be extended to incorporate one or more power transistors to take the majority of the load away from the LM317T.In our article we showed one way in which an LM317 could be coupled with a transistor to supply high currents. Replacing R2 in that circuit with a potentiometer would make a high current adjustable power supply.An alternative high current adjustable power supply ciircuit design is shown below.