Bar graph light meter by ic 741

If you want simple meter the intensity of the light in a simple way. This circuit is very interesting, because with a LED display with 5 levels.The main equipment is uA741 the most popular op-amp circuit, to used the photo transistor is a device for receiver a lighting to change is electricity very low. We use IC1 acts boost up current, or to compare the voltage levels.The VR1 adjusts the offset voltage to the LED display complete , the intensity of light to measure.The power supply size use +9 V and -9V.

Simple Light Meter by Photo Resistor
This is circuit Simple Light Meter, I use Poto Resisitor for sensitivity light. And display ligh value by M1 or mini meter 1mA. It is very small circuit,have lot part electronics and,very low c ...
Temperature - Light Brightness Meter with LCD
Circuit measures the temperature and ambient brightness of the surrounding environment at the location it is placed. The data from the ADC is the calculated and displayed on the LCD. The main ...
Light meter by LM334
The light meter is a tool, measure the quantity of light, widely used to a photography, To decide the correctness of the exposure. Sometimes, we are use with other works, such as my ...
The Simplest Possible pH Meter
Here's a schematic diagram for the simplest possible pH meter. Two 9-volt batteries power a high-input-impedance operational amplifier, such as a TL082. The pH probe is connected to the non-in ...
Strength meter using IC741
This strength meter the test can by catch 2 metals. From that time squeeze meet. It will make LED stick bright arrange prevent according to one's ability of squeezing the metal. The work of th ...