Dear Alec_t, Analog Kid, Crutschow, Delta Prime, and Danadak,
A big apology for me to you--If I'd thought about it, having a common ground for my 4.1 VDC (lithium ion battery)-powered IR detector/CD4017 AND the 120-VAC being controlled by the reLAY was a reaLEY dumb / dangerous idea. I wrote it in the drawing--guilty as charged--but would never have actually hooked up the circuit that way. (I'm a know nothing, but not a dumb know nothing.
On another happier note, I would like to thank all of you who jumped it to help me with my jittering CD4017 circuit. I hope to fix the issue this weekend, when I'll have time to spend hours, in needed, troubleshooting.
I suspect that with your expertise, I'll be able to solve it in minutes.
In any case, nice to meet y'all!