Car Battery Monitor Circuit using 4 LEDs

Car Battery Monitor Circuit using 4 LEDs

Car battery monitor circuit using 4 LEDs

This simple Car battery monitor, allow us to know the voltage of the battery at all times. To achieve this 4 leds are placed somewhere on the dash of the car. Each LED has a label indicating the battery voltage at that time.

  •  
    140
    Shares
  • 128
  •  
  • 12
  •  
  •  
  •  
  •  
2 LED Temperature Change Indicator with LM35 & 741

2 LED Temperature Change Indicator with LM35 & 741

This 2 LED Temperature change indicator shows us, by means of two LEDs, when the sensed temperature is above or below a set limit.

When the temperature is above the pre-set temperature level, LED D1 will light up and if it is below, LED D2 will light up.

  •  
    140
    Shares
  • 128
  •  
  • 12
  •  
  •  
  •  
  •  
Automatic night light circuit with one LED

Automatic night light circuit with one LED

Automatic night light circuit with one LED

This automatic night light circuit with an LED is simple, interesting and very easy to do. The circuit allows a better understanding of the operation of a phototransistor and thus be able to use it in other applications.

  •  
    140
    Shares
  • 128
  •  
  • 12
  •  
  •  
  •  
  •