As you might expect it failed to work, and of course I wasted time looking everywhere else but my defective ... shifters. A diode logic level step-up circuit. From Microchip app note DS41285A ...

Now, unplug everything that might be on or near that circuit, and turn off every light, ceiling fan, or anything else you can ...

In this installment of Circuit VR, we’ll look at a simple buck ... I didn’t do a lot of logic picking components here. I pretended I was digging through my junk box and grabbed the first ...

If it doesn’t, you probably know to check and reset the circuit breaker ... but doesn’t touch anything else? You’ll lose ...