Hello, I almost finished the experimental board of the latest version 3A power supply. As the transformer I have a transformer from the old times Bulgarian 0-30V, 0-5A power supply named "ТЕС-14". I do not know real ratings of secondary voltages and their amps, but there are written diameters of windings. As I found, there is one secondary winding with about 26,7 - 27 VAC without any load, it's wire diameter is 1,74mm. This transformer is big and very heavy, so later, if everything will work, I will probably find another, but I have a question, can I use this one for the primary experiments of the power supply, like testing, diagnose troubleshooting...?
I have attached photos of the board, there is no 12000uF capacitor connected to this time, I will do it later. Can you give some important notes, comments and warnings about the board. For example, which wires must be thick, how about 12000uF capacitor isolation... Which parts of the circuit aren't safe to touch accidently? Thank you.