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
Transformers	Resistors
Capacitors	Inductors
Electronic Filters	Power Supplies
Electricity and Magnetism Basics	Instruments & Measurements

8 LED VU meter circuit using LM324 IC

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 any specific integrated circuit used for VU meters, but we decided to use a readily available LM324 op amp. I.C.

Op Amp Tester Circuit Diagram

Very simple circuit to test 741 op amp or another IC with the same pin configuration. Circuit working explanation

How to make a Light Sensitive Sound Generator Circuit?

Light Sensitive Sound Generator Circuit – An oscillator circuit may have many applications. The diagram shows how to make it work as a light sensitive sound generator using a LDR and a 741 operational amplifier.

Light activated switch circuit with LDR and Op Amp

This circuit has many applications. It could act as a photocell and switch off a light in a room or turn on the radio when it is dawning, etc.

Resistors in Parallel – The equivalent resistance

Resistors in series and parallel. How to calculate resistors in series and resistors in parallel. How to calculate resistors in parallel using conductance. Formulas

BCD code: binary-coded decimal.

In order to share information in digital format, it is common to use a binary or hexadecimal representations (BCD Code). There are other methods to represent this information and one of them is the BCD code.

Burglar alarm using thyristor and relay

This is a simple Burglar alarm uses a thyristor as the main element and a relay as the output device. The relay can activate a buzzer or a siren.

Light Push button Circuit with time delay

This Time Delay Light switch circuit is useful to illuminate locations where a low power light source is needed. A closet, a car trunk, are good examples.

Binary Number System

The Binary Number System, unlike the Decimal Number System, where 10 figures are allowed (from 0 to 9), only needs 2 figures: “0” and “1”.

What is the Internal Resistance of a Voltage Source?

Voltage sources, whether batteries, generators, etc., are not ideal (perfect). A real voltage source is composed of an ideal voltage source in series with a resistance called internal resistance.