Theremin is one very old electronic music instrument. It make strange space type sound without touching any part. Human hand move near antenna or plate and the pitch of sound changes. This happen because hand change the capacitance value near the circuit. In this article we will show very small and Single Transistor Theremin Oscillator […]
Oscillator Circuits
555 IC Based Schmitt Trigger Circuit
555 IC Based Schmitt Trigger Circuit is a small project. It work like comparator and comparator is ON/OFF when input cross the voltage. Noise make output jump and Schmitt Trigger stop this. It have 2 limit: high and low. Input goes high then output is ON. Input goes low then output is OFF. Between them […]
Simple Adjustable Frequency Square Wave Generator Circuit
Simple Adjustable Frequency Square Wave Generator Circuit is easy and flexible. It is used in signal processing, modulation and in many projects. Here we see variable frequency oscillator using 555 timer IC which makes square waves and where user can change frequency. 555 works in astable mode and turning potentiometer changes output speed. Circuit is […]
Simple Sawtooth Wave Generator Circuit
Simple Sawtooth Wave Generator Circuit is used in oscilloscope, TV, function generator and PWM. IC 555 is very common and is easy to make sawtooth. Voltage goes up slow and drop fast in sawtooth shape. Frequency changes with potentiometer. Circuit works with 5V to 15V. Circuit Working: Parts List: Component Value/Part Number Quantity Resistor 2.2k […]
Simple Micro Flasher Circuit using IC CD 4093
Simple Micro Flasher Circuit using IC CD 4093 is easy way to make LED blink for many indicators. CD 4093 has four NAND Schmitt trigger gates inside. It runs on 6V battery and need few parts only which is very simple and good. Flashing happens because one NAND gate turn LED ON and OFF steady. […]
Timer Based Mosquito Repeller Power Saver Circuit
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 […]