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

How to protect multimeter’s 500mA fuse?

A very simple circuit that protect the 500mA fuse of a multimeter, due to the high frequency that these are burned.

6 LED VU meter using a single transistor (circuit)

This simple 6 LED VU meter circuit allows us to visualize the level of an audio signal. Due to its few components, it is a cheap circuit and easy to build.

Music Box Circuit Using a CD4017 and Two 555

This circuit attempts to emulate the operation of a music box. The maximum number of notes is 10, allowing us to make a simple melody.

12V Auto turn-off battery charger

This 12V auto turn-off battery charger automatically disconnects from mains to stop charging when the batteries are fully charged. It serves to charge the battery of our car, using the 120/240 VAC

Truth Table

Truth Table is used to simplify boolean equations obtained from digital circuits. The truth tables can have many columns, but all tables operate in the same way.

LM317 Variable Voltage Regulator Circuit

LM317 variable voltage regulator circuit diagram.

LM317 characteristics. How the voltage regulator circuit works, Regulator circuit operation improvement

Temperature Alarm Circuit using a diode

This temperature alarm circuit uses a common semiconductor diode as the temperature sensing element. The circuit can be used as a high or low temperature alarm.

5 to 30 Minute Timer Circuit using 7555 IC

This 5 to 30-minute timer circuit achieves times ranging from 5–30 minutes using the 7555 integrated circuit (CMOS version of the popular 555 timer).

Car Battery Monitor Circuit

This Car battery monitor circuit is very simple and very interesting. How many times have you found that the car does not start because the battery is discharged?

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.