So I'm trying to figure out a way to make a speaker hum remotely (my sights are pretty low... Any sound will make me happy).

I have 2 30:1 transformers and a bunch of wire. I've tried just coiling the wire up around a cylinder, hooking the transformers up in series, and using a tone generator app on an iPad to run a signal through it from a home theater amp. I can get about .6V p-p at around 14khz, too much lower frequencies trigger the protection circuit (note: I don't care too much if I fry this amp).

With no load, I can get about 350 volts out of the series of transformers. I have an a assortment of speakers around me, and none hummed (the transformers were hissing however).

I think what I'm missing is coiling the wire the correct way. I've got some capacitors laying around, but I assume there's some way to get some humming just by finding the right frequency and coiling the wire the right way.

I'm thinking I need to go for higher current rather than higher voltage with the transformers (basically reverse the way I had them) and do some actual calculation in my windings to find an inductance that matches the impedance of the system better.

Any suggestions? I pretty much don't remember any of my AC circuit stuff, I'm trying to brush up.

[Edited on August 23, 2013 at 12:22 AM. Reason : ]

8/23/2013 12:21:34 AM

:-(

8/23/2013 6:40:14 PM

I've read the OP several times, and I'm still not sure what it is you're trying to accomplish.

8/25/2013 7:45:06 PM

this^

8/26/2013 11:35:56 AM

I want to create a mutual inductance between L5 and L6, with the only fixed parameters being the signals have to be in the audible frequency range, and that my 2 transformers are fixed to their list values:



I mainly need to know the best way to go about determining what L6 needs to be, and should I hook my signal generator up to the higher-wound side of the transformer (increases current on output) or lower-wound side (increases voltage level on output).

8/26/2013 7:18:10 PM

How about a block diagram...with basic inputs,outputs/what you want to archive.

8/27/2013 2:06:26 PM

The previous diagram is as basic as it really gets. Just pretend the things are blocks, and you have a block diagram.

Just making this thread is giving me a better idea of what i need to do... have to do some impedance matching between the transformers and source/sinks.

8/27/2013 8:27:46 PM

Okay, you remember back in the days when you put your cell phone near your computer speakers and they made sounds?

I want that to happen, but on purpose, with me controlling it.

I operating under the assumption that inducing baseband audio signals would work. 1) This could be a bad assumption 2) i might not have the right parts to do it.

[Edited on August 28, 2013 at 1:53 PM. Reason : ]

8/28/2013 1:52:29 PM

I don't know, and i've been outa school for a while... But I think the cellphone was was influencing the amp, not the speaker itself.

I don't see you generating a field big enough to actually move the speaker

8/29/2013 2:44:27 PM

The speaker will be hooked up to an amplifier.

This ultimately, if works, will turn into a prank...

8/29/2013 6:06:21 PM