Electronics Area – Electrical and Electronics Tutorials and Circuits

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Electrical and Electronics Tutorials and Circuits

Digital Electronics	Semiconductors
Operational Amplifiers	Circuit diagrams & Projects
Transformers	Resistors
Capacitors	Inductors
Electronic Filters	Power Supplies
Electricity and Magnetism Basics	Instruments & Measurements

Water Level Controller Circuit using Transistor and Relay

This simple Water level controller circuit is useful to control the water level in a tank. It does this by turning On and Off a water pump depending on the status of the sensors.

2 watt Audio Amplifier Circuit with the TDA2822M IC

This 2 watt audio amplifier circuit is specially designed to consume little power and to be used with batteries or low voltage power sources.

Dual polarity Variable Power Supply (+15V / -15V) max

Dual polarity variable power supply (+/- 15 volts). Voltage source with a maximum amplitude of +/- 15 volts and a current of up to 1.5 amps.

Current Divider Rule in parallel resistors

By using the current divider rule, we can find the current in each resistor connected in parallel. The electric current passing through a circuit of two resistors in parallel is divided in two.

12 to 5 volt Converter Circuit (for cars)

This 12 to 5 volt converter circuit is very useful. It can be used to connect 5 volt electronic devices in a car with a 12 volt battery. (Automotive lead-acid batteries can be up to 13.7 volts).

Logic OR gate – Symbol & Truth Table

The logic Or gate is one of the simplest digital logic gates. The output of this gate is “High”, when one or all of its inputs are “High”. We can also say that, the output of an OR gate is “Low” only when all gate inputs are “Low”.

12 volt Power Supply using the 7805 regulator

This 12 volt power supply circuit is simple and very useful. Sometimes a 12 Volt power source is needed, and we only have 5 or 9 volt regulators (7805, 7809)

Flashing LEDs Circuit for Pedestrians using NAND gates

This is a simple flashing lights circuit uses high-intensity white LEDs that turn on and off continuously. It may be placed in any part of the body, such as an arm.

Continuity tester using 741 IC

A good application for this circuit would be to test welds made on a printed circuit board. It could also be used to test continuity of wires, connections, etc.