I have a 2812 and a smaller 2808. I have read all of the forum posts relating to these power switches, and have not seen my question addressed. I am putting my project inside of an old appliance housing. For aesthetics, I want to use the old pushbutton already mounted in the housing. The old button was a “Test” button, that is a normally closed switch, held open when pressed.
With a previous design, I had used a latching relay module that had a normally open pushbutton. The latching relay design was such that the built in switch drove a line low to toggle the relay. With the relay, I was able to add an NPN transistor across the existing relay pushbotton. and keeping the transistor “off” by holding it’s base to ground with the old NC pushbutton. Pressing the button would allow the transistor base to be pulled high, triggering the relay toggle. I can upload a drawing of this if it is unclear.
I have studied the limited schematic of the 2808/2812, but can not tell if this approach would work. I was hoping that there was a way to use the 2808/2812 with a normally closed switch, without the need for the inverting transistor. Is this possible?