How many outputs are there for solid state, battery operated for portable use listed in notes?
CREATE TABLE table_73778 (
    "Driver Unit Model No." text,
    "Release Year" real,
    "Output Voltage (RMS)" text,
    "Inputs" text,
    "Outputs" text,
    "Notes" text
)
SELECT COUNT("Outputs") FROM table_73778 WHERE "Notes" = 'Solid state, battery operated for portable use'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many outputs are there for solid state, battery operated for portable use listed in notes? ### Input: CREATE TABLE table_73778 (
    "Driver Unit Model No." text,
    "Release Year" real,
    "Output Voltage (RMS)" text,
    "Inputs" text,
    "Outputs" text,
    "Notes" text
) ### Response: SELECT COUNT("Outputs") FROM table_73778 WHERE "Notes" = 'Solid state, battery operated for portable use'