# ac from +5 volts?

#### Marcusb

Joined Jan 19, 2004
9
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.

Marc

#### beenthere

Joined Apr 20, 2004
15,819
Hi,

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.

#### thingmaker3

Joined May 16, 2005
5,083
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?

#### Triple_access

Joined Oct 27, 2005
3
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.