This circuit is very useful to use a LM741 operational amplifier which configure the voltage comparator, by means of the potentiometer establish a reference voltage connected to pin 2 of op-amp, we know that the photo-resistance varies with light intencidad, then when there is no light on the op-amp output is maintained at a high level, on the contrary if there is sufficient light incident on the photo-resistor this energy pass the level set by operating the op-amp and secondary reaction, the LED lights and activate the buzzer, we have a which will allow us to switch off when we've woken up and turn at night, the integrated support a voltage of 5V to 12V CD.
Used Components:
- 1 LM741 Op-Amp.
- 1 LED Ultra-Bright.
- 1 Ohm resistor 330R 1 / 2 Watt.
- 1 1K ohm resistor 1 / 2 Watt.
- 1 Potentiometer 50K Ohm.
- 1 LDR, or photo-resistance.
- 1 Buzzer.
- 1 Switch.
- 1 9V battery.
Used Components:
- 1 LM741 Op-Amp.
- 1 LED Ultra-Bright.
- 1 Ohm resistor 330R 1 / 2 Watt.
- 1 1K ohm resistor 1 / 2 Watt.
- 1 Potentiometer 50K Ohm.
- 1 LDR, or photo-resistance.
- 1 Buzzer.
- 1 Switch.
- 1 9V battery.
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