Police say a tip-off from the FBI and a covert cyber-sting led them to arrest and charge a man they allege was waiting at an Adelaide train station yesterday, expecting to meet a 14-year-old girl for sex.

Naim Anderson, 19, has been charged with possessing child exploitation material, procuring a person under 16 to engage in sexual activity and obstructing a Commonwealth public official.

He was released under "very strict" bail conditions after appearing in court today.

The AFP said its officers and officers from SA Police began investigating the man after receiving a tip-off from the United States Federal Bureau of Investigation in May 2019.

Police said that another US agency subsequently reported that an Australian was uploading child abuse material to social media.

Police launch covert operationPolice allege that in July, Mr Anderson began communicating with a person online whom he believed to be a 14-year-old girl, but was in fact a police officer.

Detective acting superintendent Gavin Stone said in a statement that those conversations allegedly became sexual in nature.

Police allege the 19-year-old asked to meet in person, and he asked that the girl wear a short skirt and no underwear.

The man appeared in the Adelaide Magistrates Court on Friday.(Gary Rivett: ABC News)The AFP said officers arrested Mr Anderson at an Adelaide train station, where he was allegedly waiting to meet the girl, on Thursday.

Police also allege he tried to resist arrest and that a search of the man's house, at a suburb in northern Adelaide, turned up electronic devices containing child abuse material.

Acting superintendent Stone said the arrest was a warning to any adult wanting to prey on a child online.

"The AFP and SA Police work closely together, and with our partners overseas, and have a range of skills and tactics to expose you and bring you to justice."

Anderson released on 'strict' bail conditionsMr Anderson was released on what Magistrate Benjamin Sale described as "very strict" bail conditions after appearing in court today.

"Those conditions will have significant impingement on your freedoms and on your rights, including … providing police with access to your electronic devices," the Magistrate told Mr Anderson.

Mr Anderson has only been granted permission to use the internet for banking, employment and contacting his lawyer.

Under his bail conditions, Mr Anderson will also be prohibited from contacting any child under the age of 18 or engaging in any child related work, as well as possessing a firearm or leaving the state.

The court heard Mr Anderson has no prior criminal history and is a NDIS recipient.

The matter will return to court in September.