To anticipate the dangerous and harmful wind, this wind detector circuit is able to give the early warning system. Wind detector circuit uses an incandescent lamp to detect airflow (wind detection). With the filament exposed to air, a constant current source is used to slightly heat the filament. Because it is heated, the resistance increases. [...]
The following circuit diagram is from the National Semiconductor Application Notes. It is a battery level indicator and designed for 9V battery operation. This circuit will start dimming below 7V and completely turned off at 6V. If you want the LED indicator not to dimming but just turns off everytime it reaches below 6V, just [...]
This schematic serves as a color detector. This circuit has three LDR sensors equipped with Red Green Blue (RGB) basic filter. Variable resistors (V1-V3) control the LDR sensor sensitivity. This circuit only uses two types of digital ICs, the And and Not ICs. 8 indicator LEDs represent 8 colours (Red, Green, Blue, Magenta, Yellow, Cyan, [...]
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