Nano Banana Pro is better at generating images of circuit schematics but still struggles with anything beyond a basic LED schematic.

prompt for basic LED:  generate an image of A minimal electronic schematic diagram, showing a single LED connected in series with a resistor to a 5-volt battery source. Clean lines, simple symbols, no background clutter, black-and-white technical drawing style.

prompt for 555 timer: draw A simple electronic schematic diagram showing a 555 timer in astable mode, with labeled pins, two resistors, one capacitor, and an LED on the output pin. Clean black-and-white technical drawing style, neat wiring, no background clutter.

Note: as seen in the last image, Gemini 3 Pro nails simple schematics nearly perfectly. It's Nano Banana that's struggling with correct schematic diagrams, not 3.0 Pro.