Here we describe a very simple, economical and light-weight automatic nightlight that runs on 230V AC mains and can be used as a deluxe gizmo in the sleeping room of your kids. The arrangement proposed by the author is shown in Fig. 1. Circuit diagram for the nightlight is shown in Fig. 2. It is built around three resistors (R1 through R3), two light-emitting diodes (LED1 and LED2), a light-dependent resistor (LDR1), a BC548 transistor (T1) and a capacitor (C1). Here LED1 is blue and LED2 is RGB with rainbow effect.   Little Nightlight Circuit Diagram The circuit operates off 230V AC, consuming very little current. The generic 5mm LDR drives the rainbow LED (LED2) through npn transistor T1. Series resistor R3 (150-ohm) limits the current through LED2. The sensor circuit ensures that the rainbow light switches on when it gets dark and off when there is ambient light. If desired, you can change its detection threshold by varying the value of 47-kilo-ohm resistor R2. Resistor R1 (100...

This is the DC / AC Voltage Inverter 12v for 110 - 220V Simple and Powerful. Here is from a voltage inverter 12 Volts DC to 110 or 220 Volts AC. It is capable of generating a 50 or 60 Hz AC voltage (AC) with a square wave, which can feed most electronic equipment in a home. Equipment with some types of motors will not work well with this voltage inverter and may even be damaged, so use it only on equipment that does not require AC power or that is not as sensitive to the type of wave. Voltage Inverter This circuit is very simple, uses less than 12 component to build a DC to AC voltage inverter.  DC / AC Voltage Inverter 12v for 110 - 220V Circuit Diagram The principle of this circuit is to generate a frequency between 50 and 60Hz through the integrated circuit CD 4074, this signal coming from pins 10 and 11, which are in opposite phases of 180º, these 50 Hertz pulses are taken to the IRFZ MOSFET transistors 44 that amplify these pulses giving them more current, after amplifying the...