There are rare situations when you may need less than that, yet this circuit is able to pull the output voltage down to 0 (zero) volts. Therefore the minimum output voltage is 1.25 V. LM317 uses an internal voltage reference of 1.25 V. Although its maximum current is limited to 1.5 A, the device is widely used because this value is still enough for many circuits. LM317 is a linear integrated voltage regulator with adjustable output. But you can use it to power a cooling fan if you want. Its purpose is to supply power to a custom made panel voltage and current meter. The PCB also contains an additional power supply, with fixed regulator. With this, you can pull output voltage down to 0 V. However this circuit uses an additional negative power supply derived from the same transformer winding. The usual output voltage of LM317 cannot be lower than 1.25 V. There are countless power supply projects using LM317. One of the most popular integrated circuit for linear power supplies is LM317. LM317 power supply circuit with start from zero volts and additional supply for a panel meter or cooling fan.Īn adjustable power supply is mandatory lab equipment for those who regularly deal with electronics circuits.
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