All Circuits and Electronics

Circuits Geek is a free resource online portal with tutorials on various concepts related to Electronics. Yon can also find various mini-projects and guides which you can try yourself. Use Advanced Search tool to search for the tutorial or projects you want to try out.

Class B Amplifier

To improve the full power efficiency of the previous Class A amplifier by reducing the wasted power in the form of heat, it is possible to design the power amplifier

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Thermistor Based HVAC Thermostat

In this blogpost, we will discuss about thermistor based HVAC Thermostat. The functions of heating, ventilation and air conditioning are often combined into one system in today’s homes, offices and buildings

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Twin-T Oscillator

Twin-T Oscillators are another type of RC oscillator which produces a sinewave output for use in fixed-frequency applications similar to the Wein-bridge oscillator. The twin-T oscillator uses two “Tee” shaped RC networks in

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Op-amp Multivibrator

The Operational Amplifier or Op-amp for short, is a very versatile device that can be used in a variety of different electronic circuits and applications, from voltage amplifiers, to filters, to signal conditioners. But

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Input Interfacing Circuits

Interfacing is the method of connecting or linking together one device, especially a computer or micro-controller with another allowing us to design or adapt the output and input configurations of the

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The Autotransformer

Unlike the previous voltage transformer which has two electrically isolated windings called: the primary and the secondary, an Autotransformer has only one single voltage winding which is common to both sides. This

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Electrical Relay

Thus far we have seen a selection of Input devices that can be used to detect or “sense” a variety of physical variables and signals and are therefore called Sensors. But there are

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