Apparently it is called "Obsessive, Compulsive Moduling", OCM for short.
I was still playing with my cheap 'n dirty SSB experiments, using this hideous, mal-formed 8 MHz filter...
I wanted to switch to 12 MHz - and the obsession took hold.
Here's the resulting module -
Once again, it is the now standard 12 holes wide - that way it perfectly straddles the "blocks" on my solder-less breadboard, using up real-estate in the most efficient way possible.
As soon as I had the crystal filter, I needed to be able to put a local oscillator in just the right place to be able to use it in either an upper- or lower-sideband application, so I built a little circuit that would allow me to pull a crystal a few kHz. [Editor's Comment: That's a dumb idea - why doesn't somebody have the good sense to use a DDS in this role?]
I prototyped it straight onto the solder-less breadboard but I soon realised that this would be a useful "standard module" to have as a "keeper".
Once again the OCM took hold and I ended up spiraling out of control into module construction...
As you see, the VXO module has a socket to allow the crystal to be changed and a trimmer capacitor to set the frequency.
Here are the new modules joining the existing ones on the breadboard...
There's even a 5V regulated PSU plug-in already there, providing evidence that my OCM is a long-standing disorder and not some new affectation!