Continuity Tester with Buzzer – Works on live circuits.
This continuity tester with buzzer works on live circuits. Very important, as common continuity testers are used with the power source disconnected.
Oct 242020
Oct 242020
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. Components are very common and very easy to obtain.
Oct 212020
DC motor speed control with 4049 (PWM)
This DC motor speed control with 4049, is a circuit that allows varying the speed of small DC motors of 3 or 6 Volts that are often found in toys or small electronic devices.
Oct 212020
This blown fuse indicator circuit warns us, lighting a LED, when there is a problem in an electrical installation protected by the fuse.
It is very important to correct the faults in the electrical system of an automobile or motorcycle or other, as soon as possible. This circuit will warn us when this happens.
Oct 172020
Variable voltage regulator using 7805 and 741.
Very simple variable voltage regulator with very few components. Output Voltage from 5 to 30 volts
Oct 162020
Power Supply block Diagram
Many electronic circuits need a direct current (DC) voltage source, but what we commonly find are voltage sources of alternating current (AC). In order to achieve a direct current voltage source, the alternating current input must follow a conversion process.
Oct 152020
Thermistor controlled fan circuit
This circuit varies the speed of a fan connected to a 110 or 220 Volts outlet, using just three transistors and a few additional components.
Oct 152020
Electronic Thermostat Circuit using transistors.
This circuit allows us to control the temperature of a room, turning a heating device On and Off. Very useful in winter and in very cold places.
Oct 142020
Measuring Low Resistances
There are special cases of measuring low resistances, where the value of the component to be measured is too small and the direct measurement using a multimeter / tester is not practical.
Oct 122020
Light Operated Relay Circuit using LDR.
The LDR varies its value (ohms) depending on the amount of light that illuminates it. The more light less resistance and less light more resistance, A potentiometer is used to control the light level that activate the relay
Oct 122020
The Core-laminated Transformer – Why is a Transformer Core-laminated?
Why it is not possible to use a solid iron core instead of core-laminated? What is Eddy or Foucault’s currents?
Oct 102020
The hexadecimal numbering system (base-16)
This numbering system is mainly used to simplify the representation of binary numbers and for the digital handling of colors.