Electronics Area – Electrical and Electronics Tutorials and Circuits
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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.
LM317 Variable Voltage Regulator Circuit
LM317 variable voltage regulator circuit diagram.
LM317 characteristics. How the voltage regulator circuit works, Regulator circuit operation improvement
Over-temperature alarm using operational amplifier
Over-temperature alarm using operational amplifier.
This over-temperature alarm circuit uses a common semiconductor diode as a temperature sensing element.
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?
Water Level Controller Circuit using Transistor and Relay
Water Level Controller Circuit
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 watts Audio Amplifier Circuit with the TDA2822M IC
TDA2822M 2 watt audio amplifier circuit
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 voltage source
Dual polarity variable voltage source (+/- 15 volts).
Voltage source with a maximum amplitude of +/- 15 volts an a current up to 1.5 amps.
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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