How to build a transmitter in the 20HZ range ?? Please Help If You Can.

What makes you think this will work, at any power level ?

donald

So, is this a neighbor that has the volume to loud for you? Mike

Robert, Could you explain what you mean by "transmitter" in this context, and also what you mean by "overcome/overload".

20 Hz to 1KHz is only going to get into the speaker through wires. (barring extreme magnetic energy to pull the cone out at 100 yards:-) )

I find that VHF SSB signals are good at doing that. Much, much, much easier to construct antennas that concentrate their output in a fixed direction at those frequencies as well. A couple hundred watts and a 12dBi yagi antenna and you should be set. One more thing, you'll need to obtain a federal license to do this.

"Transmitter" implies wireless Radio Frequency - possible if you have the resources of the Navy and wish to communicate with subs underwater.

Magnetic transmitter - loop around the area you want to pick up a signal. That is done, is practical, and doesn't require a license.

Don't know what you hope to do with stereo speakers. You want to disrupt the neighbors stereo? That takes a lot of power if he's using a CD player - less if he's using a radio - Radio takes a license and it is illegal to disrupt communications (but it can be fun).

Something like a high energy power supply dumping huge amounts of power into a tank circuit with a spark gap - might just disrupt a stereo no matter what the program source.

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Just build a Tesla coil and put it near his stereo.

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That's what I had in mind, but you shouldn't need the secondary. Some wannabe media star already demonstrated the coil, spark gap, thing as working for an EMP "weapon" (by stopping a running car at 40 feet with a tank circuit)

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On Sat, 27 Sep 2008 10:21:14 -0600, donald sayd the following:

Because for a few years we had a guy who would drive up and down the road with an amplified CB radio. This would come through load-n-clear on any device connected to a speaker as long as it was in the on position. When the device was off we'd never hear the CB guy talking.

I'm not talking about broadcasting for a large distance. I'd just like to broadcast 100-200 feet toward the road is all.

On Sat, 27 Sep 2008 11:35:40 -0500, "amdx" sayd the following:

No it's those loud bass thumping stereos from cars that drive by, also the same system for people who live 2 houses away from me.

I have nothing against loud music but this is literally shaking the entire house, you can feel it deep into your own body. I don't think that's fair so I'd like to see how they would feel.

If it's ok for them to interfere with me then they should be willing to let me do the same thing.

On Sat, 27 Sep 2008 13:20:21 -0400, "Tom Biasi" sayd the following:

I just need less than 200 feet of distance to transmit a simple sin wave noise overlapping the stereo speakers inside a car driving by the house.

On Sat, 27 Sep 2008 10:26:53 -0700 (PDT), JeffM sayd the following:

I fear retaliation if I were to report the noise to the police. Someone who is already violating a noise ordinance law won't be to shy from violating yet another law.

Sorry but I fear physical retaliation if I report.

Again, I am not asking to broadcast not more than 200 feet, maybe even less than that. Also, not at all hours of the day.

Robert, This is no longer an electronics issue, its a police matter.

with that budget I think you'd have to connect the device directly to the speaker.

I'm not certain what you are trying to achieve. If you are frustrated by moving noise machines then I don't think a technological solution will serve you well. anything strong enough to stop them will be illegal and easily detected.

ltspice

it'll not protect you from all rookie mistakes because no simulation is perfect.

probably best to stick to the basics group for now.

Bye. Jasen

maybe you could get a CB? those things don't broadcast at 20-1000Hz though, they're up around 27Mhz, it's imperfections in the amplifier that cause the CB transmission to come out the loudspeaker.

Bye. Jasen

so instead you propose to violate a different law in retalliation?

you'd do better to throw a brick with a note through his window. it's cheaper and you have less chance of being caught.

Bye. Jasen

** Any mono or stereo audio amplifier would be useable for the (antenna) driver. The antenna is a differnt matter - depends on the amount of wire ou are willing to use, the size of the loop, etc. Nothing has been said about the receiver: placement, distance, etc. ** Do not need a schematic for an audio amplifier; least expensive is to use one that you alredy have.

As an anti-doof-doof measure what would happen if the incoming doof was fed via a microphone and low pass filter to a threshold circuit. If the doof exceeds a the set threshold delay the original recieved doof signal ( xx milliseconds), amplify it and send it back via a sub-woofer of your own.

They turn it down - the feedback stops....

What would it sound like for the source - unpleasant?

Are you saying that your neighbours, whose homes must be similarly affected, are quite happy with the situation? There is something strange going on if that is the case.

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That simply is not going to work. You are wasting your time even talking about such an approach. Where on earth did you get that idea from?

Can I suggest road spikes that are triggered by sound level :-)

Dave.