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.
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)
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
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. The LM338 regulator works the same as the LM317 adjustable voltage regulator, known to all
How to increase output Voltage on 78XX Regulators?
Using a zener diode to boost the output voltage on a 7805, 7809, 7812, 7815, ….regulators.
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
NOR gate
NOR Logic gate – Truth Table, equivalent circuit. It can be implemented with the concatenation of an OR gate and a NOT gate.
This ON-OFF Switch circuit using a 555 timer is simple, useful and easy to implement.
This circuit has many applications on places where it is necessary to activate and deactivate (connect and disconnect) an electrical or electronic device.
Dimmer / AC Motor Speed Controller Circuit
Dimmer / AC motor speed controller. Very simple circuit that can control the speed of an AC motor or a room light level of a room using a TRIAC
Soldering Iron Temperature Controller (circuit)
Very simple soldering Iron temperature controller system You can do by yourself. It uses very few components. Ideal for DIY projects and circuits