Appearing in the dock of Belfast Crown Court on Friday, Anthony Thomas Friel, 31, pleaded guilty to possessing the explosive devices and component parts with intent to endanger life on 21 May last year.
Friel, from Gartan Square in the city, also pleaded guilty to a charge of possessing for a terrorist purpose, on the same date, namely an eye shield and visor, a mini rotary tool kit, drill bits, a heat gun, various tools and electrical material, berets, worksuits, gloves, plastic boxes, Bentley electronic timer instructions, batteries and duct tape.
A previous court heard how the bombs, bomb parts and other items were uncovered in a flat on Maureen Avenue in Derry after police stopped Friel's taxi and found three sets of keys to the flat.
A police officer told the court in a failed bail hearing that she believed the flat was used for the storage and manufacture of the explosive devices, adding that it was devoid of the usual items one would find in a lived-in property such as a bed, food and other personal effects.
Following Friday's guilty pleas, Friel was remanded back into custody and Judge David McFarland said he would sentence him in April after the Easter vacation when pre-sentence probation reports had been compiled.