LM317 & PWM Control As it turns out, if the upper resistor R1 is left in its place and lower resistor R2 is replaced with a voltage source, the output voltage of the LM317 is approximately 1.25V ...

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… ...

Li-ion charging with an LM317 There are an awful lot of Li-ion charging chips out there, and you would have thought there was one for every eventuality. But it turns out there isn’t.