09-26-2017 01:54 AM
Hi! I have an USB-6001 DAQ board and I want to use it to control a hydraulic system by using relays. But the digital output of the board is 3,3Vmax and 4mA max if I'm not wrong, and I couldn't find a relay that triggers with that output. The most common relays work with 5V and a much higher current value.
What kind of connection can I do to trigger a 5V relay without needing to create an circuit board?
10-02-2017 09:29 AM
Could you use it to drive the gate of an N-FET? Wire the Supply+ side of the Relay to a voltage source and place the N-FET between the [Drain]Supply(Gnd) and the [Source]Supply- side of the relay. The FET will act open and therefore not drive the relay until a sufficient supply is presented on the gate thereby activating the relay.