Generally, when an equipment indicates no power, the cause may be just a blown fuse. Here is a circuit that shows the condition of fuse through LEDs. This compact circuit is very useful and reliable....

Introduction to Diodes Diodes are polarised, which means that they must be inserted into the PCB the correct way round. This is because an electric current will only flow...

Diode Voltages To forward bias a diode, the anode must be more positive than the cathode or LESS NEGATIVE. To reverse bias a diode, the anode must be less ...