Electronics Area – Electrical and Electronics Tutorials and Circuits
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Electrical and Electronics Tutorials and Circuits
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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.
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.
Microphone Mixer using operational amplifiers
This Microphone Mixer combines signals from 3 different sources (3 microphones) easily and economically.
Doorbell for Deaf People Circuit using LEDs
Doorbell for Deaf People.
When a deaf person is alone in a house, it would be very difficult to realize that someone is knocking on the door without any visual warning signal.
Inverter for Fluorescent Lamps (12V to 120 / 220 VAC )
This is an inverter circuit for fluorescent lamps. It can convert 12V to 120/220V AC. The circuit uses a 555 timer, a transformer, and a transistor. It is useful for using with a car battery.
Inverter for Fluorescent Lamps (12V to 120 / 220 VAC ). Simple circuit using the 555 timer, a transformer and a transistor Useful to use with a car battery.
12V Car battery charger with SCR and Transistor
12V Car battery Charger with SCR and Transistor
The 12V car battery charger with SCR circuit is useful when you want to charge a lead acid car battery that for some reason was discharged
5A Variable Power Supply with LM338 Voltage Regulator
The 5A variable power supply uses the LM338 voltage regulator. This regulator works in the same way as the LM317 adjustable voltage regulator known to all.
Long Duration Timer with NOR Gates (CD4001)
Long duration timer or long delay time with NOR gates. This very simple circuit allows us to turn off the TV or radio in the event that we fall asleep