Temperature To Pulse Width Converter Circuit Using LM3524

Posted on Feb 5, 2014

The circuit is temperature to pulse width converter. The LM3524 to convert the output of an LM135 temperature transducer into a pulse width which can be measured by a digital system, such as a microprocessor controlled data acquisition system. In this circuit, the LM135`s temperature-dependent output (10 mV/ °K) is divided down and applied to A1`s

Temperature To Pulse Width Converter Circuit Using LM3524
Click here to download the full size of the above Circuit.

positive input. This moves A1`s output high, driving the input to the LM3524`s pulse width modulation circuitry. The LM3524 pulse-width output is clipped by the LM185 reference and integrated by the 1 MW-0. 1 µF combination. The DC level across the 0. 1 µF capacitor is fed back to A1`s negative input. This feedback path forces the LM3524`s output pulse width to vary in a highly linear fashion according to the potential at A1`s positive input. Here is a schematic drawing: The overall temperature to pulse width scale factor is adjusted with the gain trim  potentiometer. The 1000 pF capacitor provides stable loop compensation. A1, an LM358, allows voltages very close to ground to be sensed. This provides greater input range than the LM3524`s input amplifier, which has a common mode range of 1. 8 3. 4V. The oscillator output pulse at pin 3 may be used to reset counters or other digital circuitry because it occurs just before the output pulse width begins.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Powering Your Antique Battery Radio
    lm12 audio amplifier circuit diagram
    10hz 60mhz frequency meter
    solar charger circuit by lm317
    40 PIN AVR Development Board
    TDA7000 fm radio integrated circuit design
    Proximity Detector Circuit
    RC (Remote Control) Switch
    Opto switches consist of a transmitter and receiver
    Robo Atmega328p project
    Micro-power 32.768kHz clock oscillator circuit
    Simple Valve MW Transmitter circuit 30W