Attention when the part mounting
There is the direction where the part mounts that it depends on the part.
Electrolytic capacitor/Tantalum capacitor
The electrode of minus and the electrode of plus are decided.[Polarised]
Diode
Pay attention to the direction of the anode lead and the cathode lead.
ICs
Pay attention to the direction of mounting.
In the case of DIP, it becomes a turn from the 1st pin from the left to the right on the side of under seeing from the top and the mark of the hollow is done left.
The upper side becomes from a young No.(right) to an old No.(left). The counterclockwise number is attached.
In the case of pattern drawing, it assumed that you see it from the wiring side (the reverse side) of the circuit board. Then the attention is necessary, because the right and the left are sometimes mistaken.
Transistor
In the case of type such as 2SC1815, that the center lead is a collector understands right away.
But sometimes the base lead and the emitter lead conversely.
Three terminals voltage regulator
In case of 78L type, the center lead is a ground understands right away.
But sometimes the input lead and the output lead conversely.
In case of the other type like 79L, 78xx or 79xx, the pin connection is different. So, you must check with the data sheet.
Light Emitted Diode
There are many cases anode lead and cathode lead do not understand.
The long lead is a anode side( connect to plus voltage ) in the case of a new article.