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How to connect Relay with NPN and PNP transistors


Transistor is used to drive relay to connect AC loads. For efficient working, it is important to connect the relay correctly in NPN and PNP transistors. See the way of connection. Continue reading “How to connect Relay with NPN and PNP transistors”

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Articles, Circuit, Components, Design, Electronics, Electronics Theory, Home Circuits, How components work, Techniques, Utility Gadgets

Transistor Amplifier. Simple Design 21


Transistor Amplifier

Sometimes we need higher sound output from Audio based circuits using either Buzzer or Speaker. This simple Transistor based Audio amplifier will give loud sound from the Speaker or Buzzer.
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Familiarize Electronic Components Part II – Transistors


This section describes the features of Transistors, their working and Pin identification methods.

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Heat Sensor


This simple circuit acts as a warning device whenever the temperature exceeds the preset level in its vicinity. It is an ideal circuit to monitor the heat generating devices like PC, Inverter etc.

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Electronic Guard


Inrush current at power on or power resumption after a power failure is the major cause of data loss and errors in Micro controller based electronic circuits.  This circuit gives a time delay of 2 minutes to stabilize the power before the device switches on.

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