Familiarize Electronic Components Part X – Relay


A Relay is an electro mechanical switch used for driving heavy current loads in electronic circuits. Relay interface the electronic circuits with high voltage AC and there is complete galvanic separation between the two. When current passes through the relay coil, magnetic field develops which attracts a lever and changes the switch contacts. The contacts can be used to connect AC or DC loads which may then turn On / Off the load depending on the contact connections.

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Familiarize Electronic Components Part IX – Voltage Regulators


Voltage Regulators are used to give regulated power to a circuit. Most of the circuits using CMOS devices require well regulated power supply. Zener regulated power supply is simple but less reliable than the power supply using Fixed Voltage regulator IC. 78 XX series ICs are Positive voltage regulators while 79 XX series ICs are  Negative voltage regulatorsLM317 and LM338 are Variable voltage regulators.

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