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6 LED VU meter using one transistor (circuit)

6-LED VU meter using one transistor

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

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Music Box Circuit using a CD4017 and two 555

Music box circuit using a CD4017 decade counter and two 555 timers.

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

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

What is a Truth Table?

The 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.

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?

Current Divider Rule in parallel resistors

Current divider 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.

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