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# Electronic Circuits

Learn basic electronic concepts with hundreds of simple DIY electronic projects. Each project is covered with tested circuit / schematics, detailed explanation of circuit functioning and demonstration videos. Explore the below collection of mini circuits and projects and get off to a good start as an Electronics hobbyist.

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According to the Three R's slogan “Reuse, Reduce, Recycle”, we must get aware to save our planet from e-waste. Sometimes we have dead mobile phone but its battery is in good working condition. The circuit given here is used to utilise the battery for mini candle light using High bright LEDs. The main part of the circuit is IC MC34063A. It is a monolithic controller which consists of an internal temperature compensated voltage reference, a comparator, controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch. This IC was specifically designed to be incorporated in step−down and step−up and voltage inverting applications with a minimum number of external components.

In this article I will explain a very basic circuit of Clipper using simple components. Clipping circuit is a wave-shaping circuit and is used to either remove or clip a portion of the applied wave in order to control the shape of the output waveform.

One of the most basic clipping circuits is the half-wave rectifier. A half-wave rectifier clips either the negative half cycle or the positive half cycle of an alternating waveform, and allows passing of only one half cycle.

This power saving circuit is used to save electricity while ironing. The circuit will switch OFF the iron box when it is not in use. Once the ON time of the circuit is crossed, it will produce an alarm. If we press the Reset button at the time of alarm it will turned OFF the alarm and extend the ON time of the circuit to the next 4 minutes. This circuit will work as a reminder for those who always forget to turn OFF the iron box in this day to day busy life.

In this circuit is build around NE 555(IC1), op-amp LM 358 (IC2) and few components. IC1 is designed as a standard monostable multivibrator and its trigger pin 2 is held high by resistor R1.LM 358 is configured as a comparator. Its non-inverting input (pin 3) and the inverting input (pin 2). Inverting pin 2 of IC2 is connected to voltage-divider preset VR1. Using preset VR1 we can vary the reference voltage at pin 2. Buzzer is connected to the output pin 1. Initially output pin 1 of IC2 is low.