12 volt Power Supply using 7805
This 12 volt power supply circuit is simple and useful. Sometimes we need to get 12 VDC, but we only have 5 or 9 volts regulators (7805, 7809).
Sep 132018
Sep 122018
Temperature effects on resistance. Resistance Variation with Temperature.
The value of the resistance of a material varies with temperature change. For this reason, the circuit or system containing these elements should work in controled environment
Sep 112018
This temperature to voltage converter circuit, convert the sensed temperature by a thermistor into a voltage level.
The circuit achieves an acceptable performance between 0 and 24°C
Sep 102018
Energy and Electric power.
Power is the speed at which work is done.
Electric power is the multiplication of the current (amps) by the voltage (volts). P = I x V.
Sep 102018
What is a Resistor?
A Resistor is an electrical element that causes opposition to the flow of the electric current. Using the Ohm’s Law V = IxR we can find the voltage on the resistors terminals.
Sep 102018
Delayed activation 15V voltage source using LM317.
This circuit uses the LM317 voltage regulator. This voltage source also uses a bipolar PNP transistor and an electrolytic capacitor, to achieve a delayed activation of the voltage regulator
Sep 082018
What is a Truth Table?
The Truth Table is used to simplify boolean equations obtained from digital circuits. The truth tables can have many columns, but all tables operate in the same way.
Sep 062018
This simple humidity sensor circuit using a 555 timer, shows us the humidity level that a ground under test has. To achieve the goal, a couple of probes are used.
These probes are placed on the ground to be tested.
Sep 062018
Definition of inductance
An inductor has the property to oppose any change in the current passing through it.
This property is called inductance. When a current flows through a conductor, a magnetic field is created.
Sep 052018
6-LED VU meter using one transistor
This simple 6-LED VU meter allows us to visualize the level of an audio signal. Due to its few components, it is a cheap circuit and easy to build. The components are very common and very easy to obtain.
Aug 312018
Ohm’s Law relates in one equation the voltage, the current and resistance. Resistance = Resistor’s value.
A more complete expression of Ohm’s Law is achieved using the electric power formula
Aug 302018
This clock signal generator using 7400 IC, is an astable circuit which uses the TTL 7400 integrated circuit.
The 7400 IC has four 2 inputs NAND gates (NOT AND). We only use two gates of this integrated circuit.