But since we need to have 5V output, the input voltage must be at least 6.5V (there is typical 1.25 to 1.5 voltage drop across the adjustment resistors). The LM317 can regulate anything between 1.5 and 40Vdc. The input voltage must be DC from a power supply. If you plan to use a 12Vdc PSU for input, then a 16V input capacitor is enough, you don't need to select higher rating to keep the capacitor size down to minimum. But I'd rather suggest you select the proper capacitor as per your input supply voltage. Typically, a 60V or higher voltage rating is suitable for any input voltage rating. I've left the voltage range open on purpose. To select between 3.3V and 5V, a miniature slide switch is used (click to enlarge):įirst, the input capacitor. So simple: Based on the LM317, its just a constant voltage power supply. Only provide a limited amount of current, up to 30 mA, at VDD from 1.8-5V to aĬonsider this: A single LED may consume as much as 20mA. When using the USB connection, PICkit 3 can be powered from the PC but it can According to the PICkit™ 3 Programmer/Debugger User’s Guide: There is also another very important reason: To increase the current supply capability. Actually, i fried the PICkit3 PSU myself and i know for sure that it may happen. There are basically two reasons to build this circuit: First of all, it may happen - The internal PSU may be destroyed. Why use such a circuit since the PICkit 3 has a built-in power supply software controlled.
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