High Input Voltage regulator using LM340


Posted on Feb 7, 2014

This circuit is the High Input Voltage regulators, which generate voltage 5V. In these circuit LM340 input voltage must remain within the limits specified in the data sheet. If the device is operated above the absolute maximum input voltage rating, two failure modes can occur. With the output shorted to ground, or, even with the output is not grou


High Input Voltage regulator using LM340
Click here to download the full size of the above Circuit.

nded, the transistor Q1 may fail because it is operated with the collector-emitter voltage of about 4. 0V below the input. If the supply is available only running at a higher voltage than the specified maximum, one of the simplest ways to protect the regulator is to connect the zener diode in series with input from the device to level shift the input voltage. Here is a schematic drawing:




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Regulator Combination Circuits
    A sine-cosine generator
    Long-range-object-detector
    TDA2030 18W + 18W Stereo Hi-Fi Audio Amplifier circuit and explanation
    Mole Deterrent Teardown
    Automatic Light Controller Using 7806
    simple electronic organ
    10 or more switches using a microcontroller
    Linear Resistance Meter
    Geerts clock
    Doorbell MemoryCircuit
    Muscular Bio-Stimulator



    Top