Electronics Area – Electrical and Electronics Tutorials and Circuits

Welcome to Electronics Area

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

Diode Tester Circuit using 741

This diode tester circuit checks, if the diode is in good condition and also determines its polarity. To accomplish our goal, we use an 741 operational amplifier (IC1) configured as an oscillator.

Electricity and Electronics – What is the Difference?

The difference between electricity and electronics or the difference of an electric circuit and an electronic circuit, is that in the electronics circuit, a control is exercised over the flow of the electric current.

How to Extend the Voltage Range of an Analog Multimeter?

How to extend the voltage range of an analog Multimeter? In order to extend the voltage range, a resistor is placed in series with the multimeter. Calculation example.

Logic Probe Circuit using NOR gates

Logic probe circuit with CD4001 IC. This circuit is implemented with CMOS IC technology and is recommended for testing circuits using the same technology

Transistor – Zener Voltage regulator circuit

Transistor – Zener diode Voltage regulator circuit. This circuit delivers an output voltage established by the voltage of the zener diode less 0.7 volts

What is Electrical Resistivity?

Electrical resistivity [ρ] (rho) is a characteristic of materials and has ohm-meter unit. Resistivity indicates how much the material opposes the flow of electric current.

Fire alarm circuit using thermostats and SCR

This circuit uses several thermostats in parallel for its operation. They can be as many as you want and must be placed in the places where you want to sense the temperature.

Diode Connected in Parallel to a Relay Coil – Relay diode

The purpose of a diode connected in parallel to a relay coil (flywheel diode or freewheeling diode) is to avoid damaging some nearby components sensitive to high voltage.

Power Failure alarm using transformer and relay

Power failure alarm using transformer and relay

This power failure alarm circuit is very simple and is very useful when used with electric ovens, a refrigeration systems or to prevent a thief from cutting off the electrical power because it immediately warns of the problem. It also serves you when the fuses have blown.