Electronics Area – Electrical and Electronics Tutorials and Circuits

 

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Electrical and Electronics Tutorials and Circuits


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Circuit diagrams & Projects

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Electricity and Magnetism Basics

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Recent posts

12V Auto Turn-off Battery Charger with Current Limiter

12V Auto Turn-off Battery Charger

This 12V Auto Turn-off Battery Charger with current limiter, uses only 4 transistors, will stop charging the battery when it has 14 volts between its terminals and limits the charging current to a maximum of 2 amps.

How to Measure Beta of a Transistor?

How to Measure Beta of a Transistor? (β / hfe of transistor)

The beta (β) is a characteristic of each transistor. This feature is found in the NTE, ECG manuals, etc. These manuals have a minimum or approximate values of the real values. This means that we do not know the real value of the transistor.

12V Auto turn-off battery charger

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.

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

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

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?