Intercom system is device for talking at short distance; so a 9V Battery Powered Transistor Intercom Circuit uses 9V battery which is good for home or office talk. Also, it uses only transistors which is easy to understand and works well. Furthermore, the circuit has mic and small speaker as sound and a BC547 transistors […]
Transistor Circuits
Transistor Based Battery Heater Circuit
Transistor Based Battery Heater Circuit uses 12V DC with good heat and very portable; also circuit is good for outdoor, no-electric place, small incubator and emergency heat. Furthermore, it uses astable multivibrator with transistors and this transistors switch power transistor and run heat coils and finally, LED show if circuit is working. Circuit Working: Parts […]
Ultrasonic Mosquito Repellent Circuit
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 […]
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 […]