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.

This darkness detector circuit beeps when the light drops below a certain level.

The main elements of this circuit are the 555 integrated circuit, working as an astable multivibrator and an LDR which is used as darkness sensor.

1.5 v Joule Thief Circuit with no Toroid Coil

This 1.5 V Joule Thief circuit can turn ON one LED. The circuit do not use a toroid coil but it is possible to turn on a common red, green or yellow LED

6 Watts Audio Amplifier Circuit with TDA2613 (Hi-Fi)

High fidelity 6 watts audio amplifier circuit with the TDA2613 Integrated Circuit, very easy to implement due to its very few external components

Battery Charge Monitor Circuit with LM3914 IC

This battery charge monitor shows, with colored LEDs, the charging process of a typical 12-volt car battery using the LM3914 Dot / Bar Display Driver.

Continuity Tester with Buzzer – Works on live circuits.

This continuity tester with buzzer works on live circuits. Very important, as common continuity testers are used with the power source disconnected.

6-LED VU meter using one transistor

This simple 6-LED VU meter allows us to visualize the level of an audio signal. Due to its few components, it is a cheap circuit and easy to build. Components are very common and very easy to obtain.