prevent loading the system

Discussion in 'General Electronics Chat' started by Jimmy Calder, Jun 21, 2015.

  1. Jimmy Calder

    Thread Starter New Member

    Jun 21, 2015
    2
    0
    I have 16 circuits that I am trying to attach as a monitoring tool. The object is when I plug this edge connector into a circuit board then the LED will blink on the monitoring tool, stating everything is "ok", if one or two lights stay solid then we have a problem. I choose mosfet's because I need something with high input impedance, to prevent loading that circuit card down. The circuit board sends a signal that is in the microamps and a 3.7 volts logic high. I am looking for a mosfet that can receive a 3.7 Volt logic high through the gate and light a red LED on the drain?

    Is there any components that will work better the a mosfet?
     
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    Digikey shows a lot of NFETs that that turn on with Vgs between 1 and 3V. Start on this page and refine your search from there.

    This is an example:

    235.gif
     
  3. #12

    Expert

    Nov 30, 2010
    16,257
    6,762
    About your drawing...the arrow thingy is not the gate. It is internally connected to the source terminal. You can't just declare that you are attaching a wire to it, and not the source terminal.
     
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