Electronics Area – Electrical and Electronics Tutorials and Circuits

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Electrical and Electronics Tutorials and Circuits

Digital Electronics	Semiconductors
Operational Amplifiers	Circuit diagrams & Projects
Transformers	Resistors
Capacitors	Inductors
Electronic Filters	Power Supplies
Electricity and Magnetism Basics	Instruments & Measurements

Water level controller circuit using CD4001

This water level controller circuit controls the water level in a tank. Unlike mechanical controls that use a floating buoy, this circuit uses two sensors, an upper sensor and a lower sensor

Fuel Pump Cut-off Circuit

Fuel pump cut-off circuit for the car prevents the activation of the pump. Useful to increase the security level of a car which already has an alarm installed

Audio Level Indicator Circuit Diagram using LM339

This audio level indicator circuit is very interesting because it allows us to visualize the audio level intensity by connecting this circuit to the input of a loudspeaker.

Rain Detector using two Transistors

Circuit that aims to alert the beginning of the rainfall. Its few components make it an interesting and easy project.

Surge Protection Circuit (Voltage Delay Circuit)

This surge protection circuit is placed between the DC voltage source and the circuit that you want to power. This circuit delays the voltage given by the power source and allows the voltage to be applied to the circuit or device a few moments later.

Motorcycle Alarm Circuit with transistors and relay

Motorcycle Alarm circuit with transistors and relay.

This alarm has, as main elements, 3 transistors, a relay and various sensors, including motion sensors.

Electronic Doorbell Circuit using a 555 and CD4017

Electronic Doorbell circuit that lets know that someone is at the door. Made with 555 timer and 4017 decade counter allowing to change the tone of each note

12V Power Supply using Zener and 741 Op. Amp.

This 12V Power Supply has, as its main characteristic, a low output impedance. This is a very desirable feature in voltage sources and is achieved with a large open loop gain that the operational amplifier has.

Dark detector circuit using LDR and relay

This circuit uses, as a main component, an LDR (photoresistor). An LDR changes its resistance value depending on the amount of light it received. The more light means less resistance, the less light means more resistance.