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.

  •  
    128
    Shares
  • 128
  •  
  •  
  •  
  •  
  •  
  •  
12V Power Supply using Zener and 741 Op. Amp.

12V Power Supply using Zener and 741 Op. Amp.

12V Power Supply using Zener and 741 Op. Amp.

This 12V Power Supply has, as its main characteristic, a low output impedance. This is a very desirable feature in voltage sources and is achieved with a large open loop gain that the operational amplifier has.

  •  
    128
    Shares
  • 128
  •  
  •  
  •  
  •  
  •  
  •  
Temperature alarm circuit with Op. Amp.

Temperature alarm circuit with Op. Amp.

Temperature alarm circuit with 741 operational amplifier

This temperature alarm circuit with operational amplifier activates a relay when the temperature of the place to be controlled exceeds a set level. Useful for an oven temperature control or a cooling system

  •  
    128
    Shares
  • 128
  •  
  •  
  •  
  •  
  •  
  •  
1 Input - 4 Outputs Stereo Audio Splitter

1 Input – 4 Outputs Stereo Audio Splitter

1 Input – 4 Outputs Stereo Audio Splitter

This 1 Input – 4 Outputs Stereo Audio Splitter has a single input and 4 independent outputs, each amplified with an operational amplifier. Each op amp is configured as a voltage follower, to take advantage of its high input impedance and low output impedance, thus avoiding distortion in sound.

  •  
    128
    Shares
  • 128
  •  
  •  
  •  
  •  
  •  
  •  
Differential Temperature Controller (PCB)

Differential Temperature Controller (PCB)

Differential Temperature Controller.

This circuit measures the temperature difference between 2 sensors and activates a relay when they are different. It is also possible to detect a temperature change, even when the two measured temperatures are normally different.

  •  
    128
    Shares
  • 128
  •  
  •  
  •  
  •  
  •  
  •