Dear all, Is it possible to supply 5V from a single 7805, to multiple number of ICs, some of which are safety critical? I have one PCB having ICs meant for the safety critical applications. And also have another PCB for the Human interface. Can I directly get the 5V from the first PCB, for supplying power to the second one? It is an ignition control and safety system for heating appliances. So here the controller have to handle few relays, fan, valves etc. But the only thing we have to bother about is, the worst case current which will be drawn by the Controller right? So if I can estimate it, and if its under the possible limit which 7805 can provide, I can go ahead right? Can anyone tell the design considerations for such cases. Please suggest me few links also, so that I can search for it.