Here's an nRF24L01+ module with C-770 super macro mode, without the macro lens filter. This is as close as I could get.
The 10x Macro lens filter allowed me to get a bit closer. It's a very slight improvement in macro capability, with a corresponding decrease in depth of field. Image quality degradation from the filter is minimal.
Taking these kinds of pictures required manual focus. Both the depth of field and the range of focus adjustment are very limited. It's easiest to set a specific focus, and then move the camera to optimize sharpness. The camera's focus adjustment would probably come in handy for focus stacking if it was mounted securely.
I got the best sharpness at f/8. It seemed to minimize the hazy blurring seen in the above photos. It required good lighting to prevent blur from camera shake, but that's easy when the camera doesn't need to be too close to the subject.
With a more open aperture, there was an increase in blur when I half-pressed the shutter button, and f/8 decreased that. I nevertheless made my final focus adjustments with the shutter button half pressed.
This is a vacuum fluorescent display (VFD). You can see the cathode filaments which heat up and emit electrons, control grids used for multiplexing, and the anodes below them, which light up when electrons hit them.