Sub Audio Frequency Doubler

"Phil Allison"

Correction.

** The answer is an analogue frequency shifter....

....... Phil

Anyone as an schematics of a simple Analogue Frequency Shifter?

Jacques

Run the signal and the offset frequency into a double balanced mixer, like an MC1496. Pass the output through a high pass filter to remove the lower sideband. Al;so, a low pass filter to eliminate harmonics. You might try something like 100 Hz offset.

Tam

"Jacques St-Pierre"

** See "Electronics Australia" magazine, August 1997

"Audio Frequency Shifter" by Phil Allison.

Covers the band from 20 Hz to 20 KHz with a 4.5 Hz up-shift.

Will require some component value changes for your app.

A PCB is available from:

Code number: 97AFS8

....... Phil

"Tam/WB2TT"

** Utter madness.

Forget it.

.......... Phil

I disagree. It sound like a workable method.

Hold off on the crap and plainly tell us what about it is madness. That is, put up or shut up for a change.

Don

"Don Bowey"

** So says another pig ignorant f****it "ham" who has no clue what a "linear modulator" is.

......... Phil

Elektor magazine, couple of years ago. Complete with PCB. Just change a couple caps in local oscillator (perhaps it was done with xtal, don't remember). It was made for eavesdropping of bats (ultrasound).

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Siol
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"SioL" <

** Not even in the ball park.

....... Phil

Do you have a schematics somewhere I can look at?

Jacques

"Jacques St-Pierre"

** Yes - in my own files of course .

But would you be any better of if you saw them ??

....... Phil

Hey, Phil Bob,

Was this something you built to help you make funny noises on your CB.

10-4 or whatever!

Sorry, but I am not familliar with "Audio Frequency Shifting". I look to find any exemple without any luck. I found device to do that, or place to buy schematics, but nothing to let me know to to do it. Can you suggest any IC to do that? So I can get manufacturer sugested design exemple.

Bye Jacques

I don't get your point. I have used the 1496 in such circuits, and they worked just fine. In fact I used one to generate an SSB signsl at 6 - 6.5 MHz using the phasing method. Maybe you want to design this guy a 90 degree phase shift network that will be flat from 5 Hz to 50 Hz.

Tam

Tam

Fred's point is at the top of his head.

He doesn't hang around to explain his opinion, because he doesn't know anything in enough detail. So he attempts to insult and runs.

His favorite, persistent thought is Duh?

Don

"Tam/WB2TT"

** Cos you are a thick as a brick ham.

** Irrelevant. ** Irrelevant.

** I designed and published an "outphaser" covering from 20 Hz to 20 KHz within +/- 2 degrees - as part of the Audio Frequency Shifter project mentioned in another post.

It is a quite straight forward task.

.......... Phil

"Jacques St-Pierre"

** The info has been posted by me here - it is further down this page too.

Kindly answer my question.

Can YOU read and comprehend schematics ?

BTW 1

If you buy the PCB - simply ask and a copy of my article will be included.

Just how much spoon feeding do you need?

BTW 2

Do not f****ng TOP POST !!!!!!

......... Phil

This sounds like a typical feed-back killer to me. Are you sure you can modify your circuit to convert 20 Hz to say 500 Hz?

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"Nico Coesel"

** Yes - its purpose is an acoustic feedback stabiliser. ** Who needs to do any such damn silly thing ?

Are you a professional PITA f****it - Nico ??

Or just a keen amateur.

...... Phil