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

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

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

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

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

12V to 9V DC Converter Circuit Diagram (PCB)

This 12V to 9V DC converter is very useful for powering 9V DC devices in a car that uses 12V battery. The maximum current consumption allowed by this circuit is 0.8 amps.