Mosquitoes are small bugs which are very annoying, as they also spread bad sickness like malaria and dengue; so 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, hence, this simple circuit makes that […]
Transistor Circuits
Designing a UJT-Based Audio Tone Generator Circuit
Designing a UJT-Based Audio Tone Generator Circuit is easy and fun and it makes music sound like small instrument, also it use UJT as relaxation oscillator. Push buttons change frequency with different notes and then sound goes to speaker after amplifier., so press button, tone change and UJT 2N2646 will make right frequency and then […]
Air Puff Controlled LED Circuit
The Air Puff Controlled LED Circuit is a fun and easy project to build and when we blow air onto the microphone, the circuit turns the LED OFF. This circuit is useful for no-touch controls, interactive devices, demonstration projects, and display applications. Main part is electret mic which hears our puff and then mic triggers […]
Ni-Cd Battery Charger Circuit using Transistors
Nickel Cadmium (Ni-Cd) batteries are very common for rechargeable use, as they give good power and work long time with many charges. To charge them right we need a special charger made for Ni-Cd and mostly it is for 12V Ni-Cd battery pack. Hence, this article for Ni-Cd Battery Charger Circuit using Transistors shows simple […]
Smart Vehicle Headlight Brightness Controller Circuit
Smart Vehicle Headlight Brightness Controller Circuit is a cool auto system, it changes headlight brightness auto by checking outside light and also, it helps driver see better and safe at night or in tunnel. Circuit uses photo-transistor, potentiometer, diode, relay and audio transistor to check light and switch high and low beam easily. Circuit Working: […]
Simple Car Headlight Timer Circuit using Transistors
Simple Car Headlight Timer Circuit using Transistors is cool design which keeps car headlights ON for 1.5 minutes after engine is OFF. Also, it is very useful in dark place which gives light for short time. Circuit uses easy parts like transistors, resistors, capacitor, relay and few more and these all work together for timing. […]