Circuit design for short-circuting outputs when needed

Discussion in 'Mini Quads & Racing' started by April155, Dec 13, 2016.

  1. April155

    April155 Member

    I am working with two sensors with 4 pin as output.
    My question is simple: I want to make circuit that allows me to short circuit the output of either one of the sensors individually when needed.

    I am considering using quad 1:2 demux (AGD774a) and shorting either the pins on channel B together while measuring with channel A and vice versa.
    So when I want the channel for normal measurement I will use channel A and when I want output of sensor shorted I change the channel of the switch.

    So, my main question is whether using a demux to solve the requirement is a wise choice or there is some other way it can be achieved.


    • The sensor is an ultrasonic transducer which produces only millivolt level outputs.

      In use the sensor is placed in a heating chamber to increase its temperature.
      When the temperature of the transducer is varied, it produces spurious temperature-change related voltages.
      After heating we need to short the output pins to release all the residual voltage.
      The charge itself is small.

      May be I can do a worst case calculations and attach a resistance as well with it.

    • Temperature Sensors, Transducers Temperature Sensors, Transducers are in stock at Kynix Electronics. Kynix offers inventory, pricing, & datasheets for Temperature Sensors, Transducers. To know more, please view our large section of Temperature Sensors, Transducers below.
    • The voltage drop is small - in the mV range.
      I do not think that an electromechanical relay is required.

    • The sensor will not be connected to Micro-Controller.
      Shorting is needed to discharge the piezo in the sensor which occurs when the temperature is changed.
  2. GJH105775

    GJH105775 Avid Linux User, and USAF 1C6 Moderator

    Can't you just use two MOSFETS in series, or a Transistor to short it to ground (through a resistor if needed)?
  3. mozquito1

    mozquito1 Well-Known Member

    Bloody good shot old chap, I think he's a gone'r

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