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Bridge rectifiers and zener diodes are commonly used in electronic products such as computers and stereos. Bridge rectifiers are composed of a four-diode array.

These diodes convert alternating current into direct current. Bridge rectifiers have four leads, and are found in power supplies. Zener diodes are used to provide

regulated voltage for power supplies. A failure of either a bridge rectifier or zener diode prevents electronic devices from working properly.

Bridge Rectifier

• Unplug the device that contains the bridge rectifier. This ensures the bridge rectifier is without power.
• Set the digital multimeter, or DMM, to the "diode test" setting per the device's instructions.
• Test the bridge rectifier diodes. Place the DMM's two leads on two adjacent rectifier pins. The DMM will read either "OL," indicating an open circuit; or a voltage of 0.7 volts DC or less. Switch the DMM leads. An operational bridge rectifier diode shows a reading opposite of the previous reading. Perform this test on each adjacent pair of bridge rectifier pins. The bridge rectifier is faulty if the readings are the same for any of the individual diodes.

Zener Diode

• Unplug the device containing the zener diode. This ensures the zener diode has no power.
• Set the DMM to the "diode test" setting.
• Test the zener diode. Place the two DMM leads on the two zener diode leads. The DMM will read either "OL" or 0.7 volts DC. Switch the DMM leads. A working zener diode exhibits a second reading opposite of the first reading.

Zener diodes are widely used as voltage references and as shunt regulators to regulate the voltage across small circuits.

When connected in parallel with a variable voltage source so that it is reverse biased, a Zener diode conducts when the voltage reaches the diode's reverse breakdown voltage.

From that point on, the relatively low impedance of the diode keeps the voltage across the diode at that value.

Zener diodes are also used in surge protectors to limit transient voltage spikes.

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Diodes were the first semiconductor electronic devices.

Today most diodes are made of silicon, but other semiconductors such as germanium are sometimes used.

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Below is our new picture for some diodes. You can see our other products by visit our website: www.kingtronics.com