A further 30 people have been taught vital lifesaving skills on a second set of free courses run at Clacton Town Hall.
More than 50 people attended the original sessions, staged after new equipment was provided at the site in Station Road.
The defibrillator machine is on the outside of the building so that it can be used even outside office hours.
It can be used by anyone in the area and has been provided by the Holland and Clacton First Responders and paid for by Clacton Carnival Association (CCA) from the carnival street procession.
The initiative came about after CCA was keen to have the equipment installed in a central location in the town.
The free Heartstart training has now been given to more than 80 people and is a Cardiopulmonary resuscitation (CPR) course as part of a British Heart Foundation campaign.
The training includes how to recognise when a person is in cardiac arrest; how to perform CPR; how to use the defibrillator; how to place an unconscious person in the recovery position, how to help someone who is choking and how to deal with a serious bleed.
Lynda McWilliams, Tendring District Council (TDC) Cabinet Member with responsibility for health and wellbeing, said she is delighted with the response.
“We now have an extra 80 people trained up with important lifesaving skills which could be needed at any time,” she added.
TDC will look to run further courses in the future if there is a demand.