Every project needs a power supply. As 3.3volt logic replaces 5volt systems, we’re reaching for the LM317 adjustable voltage regulator, rather than the classic 7805. We’ve found four di… ...

According to datasheets, the LM317 device is an adjustable three-terminal positive-voltage regulator capable of supplying more than 1.5 A over an output voltage range of 1.25 V to 37 V. It requires ...

July 4, 2015 [Afroman] contacted us to share his new video on the LM317. The humble LM317 adjustable voltage regulator is everywhere. From wifi routers, to high spec lab equipment.

The LM317 has poor stability, identified by the sharp peak in the waveform while the custom regulator is very stable, lacking the sharp peak. Poor stability also degrades PSRR as seen in Figure 5.

The potentiometer R2 is often the most unreliable part of the circuit. As shown in the expression above, a breakdown of the potentiometer (e.g., loss of contact, open circuit) maximizes the effective ...

(Fig. 1).” The LM317 adjustable voltage regular chip was a very popular IC designed by Bob Dobkin at National Semiconductor before he left to found Linear Technology, now part of Analog Devices.