Mosquito repellers are popular to keep bugs away. They use ultrasonic sound or chemical spray. But if it is always ON then they use much electricity. To fix this a Timer Based Mosquito Repeller Power Saver Circuit is made. It turns repeller ON and OFF at set times by saving power. This also keeps repeller […]
Oscillator Circuits
Ultrasonic Mosquito Repellent Circuit
Mosquitoes are small bugs which are very annoying. They also spread bad sickness like malaria and dengue. This Ultrasonic Mosquito Repellent Circuit idea is to use high sound especially ultrasonic to above 20 kHz to scare mosquitoes. Ultrasonic sound can disturb them and make them go away. This simple circuit makes that sound. Mosquitoes do […]
Simple Triangle Wave Generator Circuit using IC LM358
In this this article we will learn how the triangle wave goes up, down, then up again and then repeats the same. It is special wave made from small waves called harmonics. It shape look like triangle because small waves match like bricks. Harmonics in triangle wave get weak fast and is not strong like […]
Function Generator Circuit using IC L8038
Function Generator Circuit using IC L8038 is chip makes sine, square and sawtooth wave. It changes frequency using outside capacitor and resistor from 0.001Hz to 300KHz. Can change and sweep frequency with outside voltage. Gives strong and clean output and make all 3 waves of same time. Need few extra parts and work stable in […]
Frequency Divider Circuit
A Frequency Divider Circuit take signal with high frequency and give signal with lower frequency. It changes the signal in way to reduce frequency. Two common ICs used for this: IC 4017 Decade Counter: IC 555 Timer: Circuit Working: Parts List: Category Item Quantity Resistors (All resistors are 1/4 watt unless specified) 10k 1 47k […]
Simple White Noise Generator Circuit
Simple White Noise Generator Circuit is DIY project. It make sound like radio hiss or static. Circuit is used for sound effect, privacy noise and testing audio tools. Noise come from electronic parts. We can use resistor or reverse transistor for noise. Capacitor remove too high or too low sound. Circuit Working: Parts List: Component […]