Digitizer


Posted on Mar 19, 2013

If the tube is level with respect to gravity, the bubble resides in the tube`s center and the electrode resistances to common are identical. As the tube shifts away from level, the resistances increase and decrease proportionally. Transducers of this type must be excited with an ac waveform to avoid damage to the partially conductive liquid inside the tube. The level transducer is configured with a pair of 2-KO resistors to form a bridge. The required ac bridge excitation is developed at ClA, configured as a multivibrator. Cl biases Ql, which switches the LT1009`s 2.5-V potential through the 100-~


Digitizer
Click here to download the full size of the above Circuit.

The bridge differential output ac signal is converted to a current by Al, operating as a Howland current pump. This-current, whose polarity reverses as bridge drive polarity switches, is rectified by the diode bridge. Thus, the 0.03ILF capacitor receives unipolar charge. A2, running at a differential gain of 2, senses the voltage across the capacitor and presents its single-ended output to ClB. When the voltage across the 0.03-~




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Sawtooth generator circuit
    Crystal display (LCD) tester
    Add-On Pulse Generator Circuit
    Guild Country Belle Telephone Radio (1956)
    74HC11 Infra-Red Remote Control Tester
    tv transmitter circuit
    3000w inverter
    A small FM transmitter (SMD)s
    555 timer Clap switch circuit electronic project
    TDA1083 Am radio receiver circuit diagram electronic project
    OEM AUX Light Switch Diagram
    SF04E emission circuit diagram composed SF04B
    Telephone control automatic lamp circuit 2
    DC to 100W amplifier circuit diagram of 500KHZ