QRP is word in ham radio which means to send signal with low power. It come from Morse code. ‘QRP’ say “lower your power” and this QRP use power rules like: Simple QRP Antenna Tuner Circuit for RF Applications help send signal better. It connect low power radio to antenna. Tuner fix mismatch, stop power […]
Designing a UJT-Based Audio Tone Generator Circuit
Designing a UJT-Based Audio Tone Generator Circuit is easy and fun. It makes music sound like small instrument. It use UJT as relaxation oscillator. Push buttons change frequency with different notes. Sound goes to speaker after amplifier. Press button, tone change and w UJT 2N2646 will make right frequency. Transistor boost the sound from speaker. […]
Simple 555 Timer Based Time Sense Tester Circuit
Simple 555 Timer Based Time Sense Tester Circuit is fun and easy to make. It uses IC 555 and make time delay. Press one switch and start timer. Guess time presses second switch and it stop. LED show result and it is good for learning how brain feel time. Circuit uses 9V battery. Circuit Working: […]
Air Puff Controlled LED Circuit
Air Puff Controlled LED Circuit is fun and easy project to make. We we blow air the LED turns OFF. It is used in no-touch controls, fun devices and displays. Main part is electret mic which hears our puff. Mic triggers transistor and transistor turns OFF the LED. It works with small power like 3V […]
Electronic Coin Toss Circuit using IC 555 and JK Flip-Flop
Many times people make choice by flipping coin. But this method is not always fair but sometimes it give biased result. To fix this we can use Electronic Coin Toss Circuit using IC 555 and JK Flip-Flop. It works like real coin flip using digital technology and LED. This circuit has two main parts: In […]
Metal Detector Circuit using IC CS209A
Metal Detector Circuit using IC CS209A is a cool tool to find metal near by. It is used for security, treasure hunt and in industries. This article shows simple but strong circuit using one chip called CS209A. It is easy to make and works great to detect metal. We can find metal from few inches […]