bargraph light meter with ic 741
When you want to build temple light circuit model easiness. I begs for to advise this Bargraph Light Meter circuit , It uses pillar equipment be IC 741 or IC op-amp the highly popular. By this circuit will show with LED 4 amounts are level. And have poto transistor be the equipment detects the light. Besides you still can fine R3 for control the rapidity has of the circuit with.
Bargraph Light Meter by IC 741
Q1 is Photo Transistor,
R3 : Offset Adjust,
LED Display 3 LED.
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.
Source : Bargraph Light Meter by IC 741
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