Electronics Area – Electrical and Electronics Tutorials and Circuits
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Electrical and Electronics Tutorials and Circuits
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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
Dimmer / AC Motor Speed Controller Circuit using TRIAC
A very simple circuit that can be used to control the speed of an AC motor or the level of a room light using a TRIAC.
Soldering Iron Temperature Controller (TRIAC – DIAC)
Very simple soldering iron temperature control system you can make yourself. It uses very few components. Ideal for DIY projects and circuits
Two-way traffic light Circuit using 555 and CD4017
This Electronic two-way traffic light circuit achieves the functionality of a typical two-way traffic light using a 555 timer and a CD4017 decade counter.
12V to 24V Converter Circuit
This 12VDC to 24VDC step up converter is very useful to power devices that run on 24 VDC when we have a 12VDC voltage source as it could be a car battery or alike.
20 Amp Variable Power Supply using LM317
20 Amp variable power supply with an output voltage from 1.5 to 15 volts using the LM317 regulator and 4 2N3055 power transistors to amplify the current capacity