Automatic night light using 555 and relay

This Automatic night light using 555 IC turns lights on when there is no daylight. The circuit is perfect for lighting single places such as the garden, the front door of the house, the entrance to the garage, etc. 

TDA2822M 2 watt audio amplifier circuit

This 2 watt audio amplifier circuit is specially designed to consume little power and to be used with batteries or low voltage power sources.

Electronic sound control circuit (applause)

This electronic sound control circuit works like a sound activated relay and can activate or deactivate a device connected to it, by two consecutive claps.

Twilight switch circuit with Op. Amp.and LDR

This Twilight switch circuit activates a light, a lamp, a motor, etc., at the time of sunset and performs the reverse process at dawn.

This is an ideal circuit for activating a security light that must be on all night.

400 watts Stereo Amplifier Circuit using STK4050

This 400 watts stereo amplifier circuit uses the Sanyo STK4050 hybrid IC, a high quality low noise amplifier. Its maximum output power is 200W per channel

Electronic Music Metronome circuit using a 555 timer

This Electronic Music Metronome circuit, allows those persons who study or are music fans, to keep the timing, quite accurately.

This 12v battery charger circuit using a LM350 and LM301A op-amp.

This 12v battery charger circuit allows you to charge a 12-volt car battery using a LM350 voltage regulator and a LM301A operational amplifier.

With this sound activated flash circuit, you can achieve incredible pictures of the most unexpected moments.

Pictures like a water balloon that just burst and the water still floats in the air, or when an object of any type explodes.

How to Protect the 500mA Fuse of a Multimeter?

It is very important to protect the 500mA fuse of a Multimeter due to the high frequency that these are burned.

Water level alarm with three transistors

Water level alarm. Simple & small alarm with few components. Has small current demand, it can work with a 9V battery for a long time

Logic probe circuit with CD4001 IC

This logic probe circuit is useful for people who needs an instrument to measure the logic levels on digital circuits. This circuit is implemented with CMOS IC technology and is recommended for testing circuits using the same technology

Transistor – Zener diode Voltage regulator circuit

This circuit delivers an output voltage established by the voltage of the zener diode less 0.7 volts. The 0.7 volts is the average voltage drop between the base and the emitter of a transistor. (Vbe)