ProtoDAC TDA1387 X8 project

[OnkelPH]

Do you mean getting the 5V from the pin 2 and/or 4 of the RPi GPIO? I don't think the voltage differential will be enough. The voltages are usually less than 5.1V, and that is right on the margin of the dropout voltage of the LT1963 to get 5.0V with the current draw of ProtoDAC. You will need at least a 100mV differential. If the voltage differential is less than indicated in the chart on page 1 of the datasheet, the LT1963 won't regulate.

Thanks, so I can get 5v from pin 2/4, but LT1963 will most likely not work. Understand.