Electronics Area – Electrical and Electronics Tutorials and Circuits
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Electrical and Electronics Tutorials and Circuits
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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.
Variable voltage regulator using 7805 and 741
This is a very simple variable voltage regulator with a minimum of components. The output voltage ranges from 5 to 30 volts.
Mini variable Power supply circuit (0-30V, 1A)
Totally transistorized with 0 to 30V output voltage range. It can be used for projects where the current consumption is 1A max.
Automatic night light circuit with one LED (PCB)
This automatic night light circuit with a LED is simple, interesting and very easy to do. The circuit allows a better understanding of the operation of a phototransistor and thus be able to use it in other applications. (PCB)
SCR (Silicon Controlled Rectifier)
What is an SCR?
The SCR (Silicon Controlled Rectifier) is a 4-layer semiconductor device that works as an almost ideal switch.
NOR Gate – The Universal Gate
The NOR Logic gate – Truth Table, equivalent circuit. It can be implemented with the concatenation of an OR gate and a NOT gate.
Main Power Failure Alarm and battery backup circuit
Main Power failure alarm and battery backup Circuit
This Main Power failure alarm circuit tells us when the electricity that powers a system or circuit, is gone.
Ohm’s Law and Electric Power – Formulas
Ohm’s law and electrical power. Ohm’s law relates V, I, and R. A more complete expression of Ohm’s law is achieved using the electrical power formula
555 Timer Tester circuit
This 555 IC tester circuit, allows us to make sure that this integrated circuit works properly. This same test can be achieved by operating the 555 as astable multivibrator, but this test does not allow observing its operation in detail.
Capacitor and the Alternating Current
Capacitor and the Alternating Current. Unlike the behavior of a capacitor in direct current (DC), in the alternating current (AC) the current passes more easily through a capacitor.
Audible Logic Probe using the 555 Timer
Many logic probes use LEDs to visually indicate the logic state of the point under test. This causes the user to have to see the point under test and the LED at the same time.
What is a Logic Probe?
A logic probe is a simple and inexpensive instrument contained within a pen-like tube. It has 3 LED indicators that show the status of the point under test. 5 DIY Logic Probes