Electronics Area – Electrical and Electronics Tutorials and Circuits

 

Welcome to Electronics Area

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


Recent posts

Continuity tester using 741 IC

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.

Measuring 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

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

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

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.