Power Supply Lm317 Adjustable Voltage And Current Regulator Circuit

The lm317 has a low current rating that limits its use.

Power supply lm317 adjustable voltage and current regulator circuit.

It can supply greater than 1 5 a at the output. High power dc regulator 4 20 volts 20 amps by lm338. The input supply source is connected across the vin and ground of the upper current regulator circuit the output from this stage goes to the input of the lower lm317 variable voltage regulator stage. I personally love this ic yes it s not a transistor a lot not because it server it purpose well but because it s cheap easy and never disappoints you while making a regulated dc power supply.

If you add two diode series with the output to reduce voltage start with 0 volts. This circuit looks like in my first variable dc power supply but this high current higher than 3 amp. I have several surplus laptop power supplies often rated at 19v at several amps. For a transformer that can supply at least 30 amperes and voltage secondary coil should not be less than 18 volts.

This is the simple solution. Youtube video current boost lm317 adj. It s an adjustable three terminal voltage regulator ic with a high output current value of 1 5a. In most of the applications due to irregular loads the output voltage produced has fluctuations in it which can lead to damaging loads.

So we need to use all the capacitors which are rated at 50v in the circuit. To be precise the upper lm317 forms the current regulator stage while the lower acts like a voltage controller stage. The rectified voltage at capacitor c1 is around 42 30v 30 volt sqr2 30v 1 41 42 30. Resistor 240ohm capacitor 1uf and 0 1uf potentiometer 10k battery 9v circuit diagram lm317 voltage regulator ic.

Lm317 is a positive voltage regulator with an adjustable voltage range from 1 25 v to 37 v. Lm317 voltage regulator ic. It can apply voltage output 1 25v to 35v. Lets make a high current power supply with lm317 voltage regulator which can supply upto 5 amp lm317 is one of the oldest most used and wonderful linear voltage regulators.

This voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage. So have a few components. Although the voltage regulator lm317 protects the circuit from overheating and overload the fuses f1 and f2 are used to protect the power supply circuit. The lm317 is an adjustable 3 terminal positive voltage regulator capable of supplying in excess of 1 5 a over an output voltage range of 1 2 v to 37 volts.

From all principles above we have circuits applications as shown in figure 4 if you want to add the ic lm338 enabling them to be higher current.