I am working on a project called LM317 power supply.
The schematic is from the internet, and contains the regulator, filter capacitors, rectifier, potentiometer and protection diodes.
I designed a layout and I made the PCB. The PCB contains large copper pours.
When I started to solder I realized that using the soldering station at about 350C, the copper pour took all the heat and the joint was not good.
So I started to find a solution to this problem.
I took my soldering gun and I started to solder the components and I covered the copper pour with solder, to prevent oxidation.
After I soldered using the soldering gun, I realized that the capacitors were hot.
What should I do to check if the capacitors are still good ?
Can the heat destroy the electrolytic and ceramic capacitors while soldering ?