A closer look at a low cost Hot Air Gun
Deciding it was time to move from match sticks and hair dryers on to something more professional, an investigation is made into this Antootan brand hot air gun that was purchased from Aliexpress.
It came with a few airflow focusing attachments which look like they’ll be helpful.
Well built with an understated dark-green body that incorporates a hand guard.
A switch at the trigger position allows switching between off and two airflow speed settings.
Internal construction appears to be incredibly simple and straightforward.
The motor is reminiscent of what would be found inside hair dryers.
Power cord is routed neatly with adequate strain relief. This detail is evident of incremental design.
The motor, the heating element, the control circuitry, the power switch and the power cord.
With everything except the power switch being directly soldered to the control circuit board, it stands to reason that the designers believed the power switch is main point of failure in this particular design.
The power switch is rated at 10A/250V or 16A/125V with multiple marks of certification.
A full-wave bridge rectifier on a specially designed circular ring-shaped circuit board attached at the rear of the motor. This is an extraordinary step that cannot possibly be more cost effective than a discreet component.
The heating element is buried within its assembly and invites no further interest.
A first peek at the circuitry reveals all sorts of surface-mount and through-hole components.
With each and every component laid out neatly like a well-planned garden.
Equal care was given to the pcb traces and their routing by the designers.
The first of the notable components, a BT134-600E triac.
Another triac, a BTA12-600B.
And a low power 5v voltage regulator, the 78L05.
Chip S1 will be allowed to keep its secrets.
Temperature control is between 100C to 650C on a superbly contrasty display.
Power usage while off is under one watt.
And power-on consumption ranges from around 300W at 100C to 1500W at 650C.