How to click a relay with a low signal?
October 5, 2009
I need to click a relay when a signal goes low. I have a couple relays on Walter, but they all click when signal goes high. These are pretty straight-forward, just a simple 5v relay, and a 2n222 NPN transistor to click it when a data-level signal goes high. --No Problem
In this case, I will have a steady data-level signal high, and I need the relay to click when it goes to gnd. Any thoughts? I, of course, do not want to use a DPDT relay and have it energized all the time.