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
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Nov 182020
Nov 172020
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.
Nov 062020
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.
Nov 042020
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
Nov 022020
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
Oct 262020
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.
Oct 242020
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.
Oct 242020
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.
Oct 212020
DC motor speed control with 4049 (PWM)
This DC motor speed control with 4049, is a circuit that allows varying the speed of small DC motors of 3 or 6 Volts that are often found in toys or small electronic devices.
Oct 212020
This blown fuse indicator circuit warns us, lighting a LED, when there is a problem in an electrical installation protected by the fuse.
It is very important to correct the faults in the electrical system of an automobile or motorcycle or other, as soon as possible. This circuit will warn us when this happens.
Oct 172020
Variable voltage regulator using 7805 and 741.
Very simple variable voltage regulator with very few components. Output Voltage from 5 to 30 volts
Oct 162020
Power Supply block Diagram
Many electronic circuits need a direct current (DC) voltage source, but what we commonly find are voltage sources of alternating current (AC). In order to achieve a direct current voltage source, the alternating current input must follow a conversion process.