Well. It turns out that I ordered an XO crystal and not a VCXO crystal to build the design and prototype of the timing module. So retreated and went for both SMD and PTH to get things going. Probably play it safe with PTH (plated through-hole) to get things back on track.
Sort of a big deal and I’ll have to put my attention on the 556 one-shot and 1-second centered pulse with variability. It will probably take a week to get the VCXO. If I expect to have a continuous pulse supply from a single rail voltage, I must use a VCXO.
