Simple Audio Level Indicator Circuit using IC LM3915 show sound strength with lights. Its display driver is good for sound visual circuits. It takes analog voltage and can light up 10 LEDs, LCDs or other displays in line. Here LED VU meter is used. Music lovers like it because it show sound level with lights. […]
Free Energy From Air Circuit
This Free Energy From Air Circuit uses free energy from air. Idea is simple as air is full of radio waves. When radio is ON we can hear static and even in empty place. So if we make strong power setup then air can give us endless energy. Circuit uses antenna, a good crystal diode […]
Power ON Delay Circuit
Power ON Delay Circuit using IC 555 give time gap between power ON and circuit starts. When trigger comes, IC 555 work in monostable mode and give one output pulse for set time. Resistor R1 and capacitor C2 make timing part for delay. Output stay low with circuit OFF when capacitor is charging. When power […]
Simple Decimal Counter Circuit
In this article for Simple Decimal Counter Circuit instead of count in binary (0 to 1) the decimal counter count in base is 10 (0 to 9). One simple and main way to make it: Use Decade Counter IC which is good for beginners. The IC like 4017 is easy to find and can already […]
Automobile Brake Failure Indicator Circuit
Automobile Brake Failure Indicator Circuit is backup system. It tell driver if brake system have a problem. It uses electric parts to check brake and if problem comes then it show light or make sound. This circuit work only in cars with negative grounding. It also give signal if brake switch does not work. In […]
Panic Alarm Button Circuit using IC 555
Make cheap and easy Panic Alarm Button Circuit using IC 555. IC 555 work like bistable circuit with two states: alarm ON and alarm OFF. Press panic button, timer start and stay ON until reset button is pressed. Timer give high output, turns ON transistor and then LED light and buzzer makes sound. Circuit Working: […]