 Diode bridge
As for the diode bridge, the four diodes are combined to do the full-wave rectification. As for the lead wire, the input terminals of the alternating current are the two, the positive output terminal is the one and the negative output terminal is the one. Because the position is decided respectively, ypu connect so as not to make a mistake.
Light-Emitting Diode (LED)
This is usual light-emitting diode (LED). However, the forward voltage rather depends on the kind of the LED. When using the forward voltage of the LED like this time, it had better confirm the forward voltage and the stability with the voltage to the change of the electric current.
Resistor
It is enough at the 1/8-W resistors.
Ripple filter capacitor
This time, because the load current is small, it is not necessity to make the value of the capacitor big.
Wiring terminal
This terminal is used to connect the wiring to connect with the external circuit. Even if it connects the wiring with the printed board directly, there is no problem.
Printed board
Because the circuit this time wasn't big, I cut the printed board in the necessary size and used it.
Metallic stud
I use this to install the printed board to the case. There is not necessity of the metal.
I used the one with the 5-mm height for the 3-mm screw.
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