ac from +5 volts?

Discussion in 'General Electronics Chat' started by Marcusb, Jun 21, 2006.

  1. Marcusb

    Thread Starter New Member

    Jan 19, 2004
    If I send a +5v square wave into the secondary of a 120v/5v transformer, will I get a/c on the primary? Would it be 120v, 60v, or a different RMS value?

    Does frequency have a bearing on current capacity as well? Eg. 400hz vs 2kHz

    I want to use a microcontroller to drive electroluminescent wire (neon wire).

    Thanks for help.

  2. beenthere

    Retired Moderator

    Apr 20, 2004

    Don't think that approach would be entirely successful. The transformer will not be real happy with a square wave input, but the inductance will round things off a bit. The hard part is the frequency - a 60 Hz transformer won't do with a 400 Hz - or 2 kHz - input. The coils and core are a resonant structure, so off frequencies will not produce expected outputs.

    Also, the step-up ratio is 24 to 1. If your neon tube requires 100 ma to light, you will also need to supply 24 times as much current to the secondary - 2.4 amps. Your source isn't likely to be able to handle the load.
  3. thingmaker3

    Retired Moderator

    May 16, 2005
    What frequency and voltage do these specific EL wires need? Stats for EL wires are all over the map.

    And do they really need a sine wave?
  4. Triple_access

    New Member

    Oct 27, 2005
    coil front = crystal ear phone
    coil back = led1 & led2 "One led is hooked diff from the other" imagine 2 leds hooked to one side of the coil.

    Tap the earpeice with a pencil, led1 will light. as led one burns out, led 2 will light. this shows time in the coil.