A carpenter will be sentenced later for having a stash of explosives at his house.
Benjamin Harris, 30, pleaded guilty at the Old Bailey to two counts of having an explosive substance and one count of making an explosive substance.
Police uncovered Harris's hoard when they raided his home in Highcroft Crescent, Heathfield, East Sussex, on March 13 2013.
They seized a quantity of black powders, pyrotechnic fuses, chemicals to make improvised fireworks, a small number of IEDs (improvised explosive devices) and commercial fireworks.
They also found a USB stick containing electronic manuals, text books, academic and other documents about explosives.
At an earlier hearing, Harris admitted having the black powder and oxidising agents as well as making 410g (14.5oz) of low-explosive black powder.
Harris had also pleaded guilty to breaching health and safety rules and a cannabis offence.
The court heard he had accepted that he manufactured explosives - but only to make fireworks.
He denied having five documents useful for terrorism at the time of his arrest and those charges were left on file.
Harris, who was said to have psychological issues, is on bail.