An electronic circuit consist of few or lots of electronic components for it to function properly. The electronic circuits such as the power supply, vertical, horizontal, high voltage, scanner, audio, color, memory, inverter, converter, feedback and etc are the circuits that forms the purpose of electronic equipment. In other words, different electronic equipment have different task because it has different types of electronic circuits in it. This month article is about to reveal the purpose of some electronic components in those electronic circuits. Let’s begin and analyse those components.
Relay
If you have repair electronic equipment before, I believe you have definitely seen a relay in electronic circuits. Sometimes in a circuit can have more than few relays. A relay is basically a switch operated by magnetic force. This magnetic force is generated by flow of current through a coil in the relay. The function of a relay is to open or close a circuit, when current through the coil is started or stopped. Now, the question is why there is a diode located parallel to the coil in the relay as seen from the schematic below?
Current flowing through a relay coil creates a magnetic field which collapses suddenly when the current is switched off. The sudden collapse of the magnetic field induces a brief high voltage ‘spikes’ across the relay coil which is very likely to damage ICs and Transistors. The diode which is also called as protection diode allows the induced voltage to drive a brief current through the coil (and diode) so the magnetic field dies away quickly rather than instantly. This prevents the induced voltage becoming high enough to cause damage to ICs and transistors.
Relay
If you have repair electronic equipment before, I believe you have definitely seen a relay in electronic circuits. Sometimes in a circuit can have more than few relays. A relay is basically a switch operated by magnetic force. This magnetic force is generated by flow of current through a coil in the relay. The function of a relay is to open or close a circuit, when current through the coil is started or stopped. Now, the question is why there is a diode located parallel to the coil in the relay as seen from the schematic below?
Current flowing through a relay coil creates a magnetic field which collapses suddenly when the current is switched off. The sudden collapse of the magnetic field induces a brief high voltage ‘spikes’ across the relay coil which is very likely to damage ICs and Transistors. The diode which is also called as protection diode allows the induced voltage to drive a brief current through the coil (and diode) so the magnetic field dies away quickly rather than instantly. This prevents the induced voltage becoming high enough to cause damage to ICs and transistors.Source: http://www.electronicrepairguide.com/
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