Transistorized Voltage Regulator Why use a transistorized voltage regulator? If we use a half or a full-wave rectifier we can convert an AC voltage in a DC one. This converted voltage is unregulated, because the output voltage is not constant and can change due to variations of the load value. To reduce these variations we connect […]
Automatic night light circuit with one LED
This automatic night light circuit with an 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.
Current Limiter for Voltage Regulator using Transistor
If the current required in the load exceeds the maximum allowed, the voltage regulator can be damaged. To avoid this problem it is necessary to have over current protection.
Multitone generator circuit / Open door indicator using CD4001
This very simple multitone generator circuit has many applications but here it is shown as door indicators, generating a different tone for each door of our house
What is the Dielectric constant / Relative Permittivity? (Capacitor)
The dielectric constant is the ratio of the permittivity of a substance to the permittivity of free space. It is a dimensionless physical constant
This light detector circuit activates a lighting device through a relay when the intensity of the daylight is no longer sufficient.
It can be used to illuminate the main entrance of the house, a showcase that must be kept lit at night, an unsafe area at night, etc.
LED Sequencer using 4017 – LED Chaser.
This Circuit has 10 LEDs connected to the 4017 decade counter outputs. LEDs light up in sequence. Only one LED is ON at a time
Ohm’s Law explanation
Ohm’s law states that the voltage across a resistor is directly proportional to the current flowing through the resistance and directly proportional to the resistance of the circuit.
How does a Zener diode voltage regulator work?
Design method. Determination of the voltage, power of the zener diode and of the limiting resistor Rs
Voltage regulators
Voltage regulators (linear, switching) provide a stable and fixed voltage output to give energy to electronics circuits from an unregulated power source
12 Volt Car Battery Charger with LM7815
This 12 volt car battery charger is a circuit with few components that allows us to charge a common car battery. Battery charging stops when it reaches its maximum voltage.
Photodiode Amplifier – Current to Voltage Converter.
Very simple circuit that amplifies the current signal generated by a photodiode and transforms it into voltage with a controlled gain