Electronics Area – Electrical and Electronics Tutorials and Circuits

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Electrical and Electronics Tutorials and Circuits

Digital Electronics	Semiconductors
Operational Amplifiers	Circuit diagrams & Projects

Logic OR gate

The logic Or gate is one of the simplest digital logic gates. The output of this gate is “High”, when one or all of its inputs are “High”. We can also say that, the output of an OR gate is “Low” only when all gate inputs are “Low”.

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12 volt Power Supply using 7805 regulator

12 volt Power Supply using 7805

This 12 volt power supply circuit is simple and very useful. Sometimes a 12 Volt power source is needed, and we only have 5 or 9 volt regulators (7805, 7809)

Flashing LEDs Circuit for Pedestrians using NAND gates

Flashing Lights for Pedestrians made 4011B IC.

This is a simple circuit that uses high-intensity white LEDs that turn on and off continuously. It may be placed in any part of the body such as an arm.

Continuity tester using 741 IC

Continuity tester using 741 operational amplifier that operates as a differential amplifier.

A good application for this circuit would be to test welds made on a printed circuit board. It could also be used to test continuity of wires, connections, etc.

Thermistor Controlled Fan Circuit – AC Fan

Thermistor controlled fan circuit

This circuit varies the speed of a fan connected to a 110 or 220 Volts outlet, using just three transistors and a few additional components.

Measuring Low Resistances

Measuring Low or very low resistances

There are cases where the resistance is too low and a direct use of the ohmmeter is not practical. So a special method is needed

NAND Gate – The Universal Gate

NAND gate – Truth table.

NAND gate, also called universal gate, is a gate that produces a logic “0” output only when all logic inputs are “1”. Truth table.

The logic NOT Gate – Symbol, Truth Table

The logic NOT gate

The NOT gate is a logic gate that has only one input and one output. The output logic level is the opposite of the input logic level

How to Measure Resistance with a multimeter

How to use a multimeter to measure resistance (resistor value). The range selector. Digital multimeter and analog multimeter / VOM

How to Make a Current Flow Indicator?

This Electric Current Flow Indicator gives a visual indication that there is a current flow. Possible applications for this small circuit may be: a battery charger, a voltage power source, etc.

In order to achieve our objective we place 3 rectifier diodes in series, which in turn are in series with the load / battery.

8 LED VU meter circuit using LM324 IC

8 LED VU meter made of IC-LM324.

This circuit can be used to display the variation of an audio signal in a group of 8 LEDs, behaving like a VU meter. We could use an specific integrated circuit used for VU meters, but we decided to use a readily available integrated circuit: The LM324 op amp.