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Post: Just to be sure i understand what you wrote: let say the main power will be 24V 10A like this: (broken link removed) i will use this 24v to power dc motor, relays, etc.. then using [url=https://www.ti.com/product/PTN78020W]PTN78020W[/url] to "get" 5V and use it to power the RPI and the 2 IO Pi plus that connected to the Pi with the Link jumper so the IO Pi plus boards get its power also from the RPI power. 1. is what i describe here is correct ? 2. is it will be true to assume that as long the RPI is powered with "enough" current let say 5V 6A i can use the same power also to power all my abelectronics boards stacked on RPI: 2 x IO Pi Plus -- all outputs will be connectedto opto-isolators so they draw minimal current 2 x ADC Differntial board 2 x Servo Pi 1 x RTC board 1 x Serial board if the RPi takes about 2.5A I'll have 3.5A for all the boards, and to achive that all the outputs need to be connected to opto-isolators, and i'll not drive any load directly from the output pin, but using circuits like the example here: https://www.abelectronics.co.uk/kb/article/1052/driving-relays-or-higher-loads-with-the-io-pi Thanks !