Electronics Area – Electrical and Electronics Tutorials and Circuits
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Electrical and Electronics Tutorials and Circuits
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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
This circuit varies the speed of a fan plugged into a 110- or 220-volt outlet using only 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
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
The logic NOT Gate – Symbol, Truth Table
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
Measure Resistance with an Analog Multimeter
How to use the analog multimeter / VOM to measure resistance (ohms). How to use the range selector and how to set the needle to zero ohms.
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.
Op Amp Tester Circuit Diagram
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