Hey everyone,
I have a project i'm working on where i'm using an MCU to control a bunch of 5v relays (something like 20 relays), some LEDs and such.
I have tested the thing powering the relays from a bench supply and the uC is powered from USB.
I want to make this stand alone, and i am concerned about choosing a PSU. I want to use a simple linear reg based psu. My concerns arise from using so many relays and the peak currents that result. I don't want bad things to happen, either to the PSU or the uC.
So what should i do? Can i run everything off a simple LM317 rectifier PSU with a larger filter cap? Should i pull 2 regs off of one bridge rectifier? 2 Bridge rectifiers/regs? etc...
Thanks in advance!
I have a project i'm working on where i'm using an MCU to control a bunch of 5v relays (something like 20 relays), some LEDs and such.
I have tested the thing powering the relays from a bench supply and the uC is powered from USB.
I want to make this stand alone, and i am concerned about choosing a PSU. I want to use a simple linear reg based psu. My concerns arise from using so many relays and the peak currents that result. I don't want bad things to happen, either to the PSU or the uC.
So what should i do? Can i run everything off a simple LM317 rectifier PSU with a larger filter cap? Should i pull 2 regs off of one bridge rectifier? 2 Bridge rectifiers/regs? etc...
Thanks in advance!