Negative voltage question ?

Discussion in 'General Electronics Chat' started by curry87, Feb 16, 2011.

  1. curry87

    Thread Starter Member

    May 30, 2010
    If i had a single device in a circuit that needed 10v to function and had only a 6v+ supply would the device function if i made the negative supply -4v and how is this possible if the ground node is always 0v ?
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    There are discussions on occasion on the forum about 'ground' and its meaning in relation to circuit behavior. It's quite possible for an active device to function under the conditions you propose. In this case 'ground' may simply be a point of reference which happens to lie within the range of the power supply rather than at the lower (?) extremity.

    I could imagine, for instance, a differential amplifier circuit which would fit this rather general description.

    Do you have something specific in mind which would assist the discussion?
  3. Jony130

    AAC Fanatic!

    Feb 17, 2009
    Look in my schematics.
    And maybe you will understand the concept of GND (common reference point that all voltages will be measured from).