Bleeping bleeping . . . Spent hours trying to finally lock down where a buried transformer is. Still no luck. Switch for under cabinet lights is 120VAC. Each section of UCL has a single piece of romex coming out of the wall with 12VAC. Tried signal tracing from both ends hoping I could find the junction box/transformer by finding a common point for everything. No luck. There is a tiny chance that it is in a portion of the attic that is a prick to access (I need to drop the soffit and climb up to get there). Left the lights on for a long time and looked for heat from a transformer (looked at backs of cupboards, around switch, ceiling, floor above, above cabinets, etc). Nothing found.
@nobbie48 or anyone else ever played with TDR? I'm not sure if that could help me find where this bleeping transformer is. I need to do some more research to see if TDR can bounce off the transformer (and have sufficient distance resolution to help me). Buying a TDR good enough for this project seems not cost-effective but I could use a scope to make one.
I want to switch to LED's but with current wiring, i'd need a driver in every cabinet section and those drivers would need to be 12VAC which is not common.