Sub Audio Frequency Doubler

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"

"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"

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"

......... 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).

"SioL" <

....... Phil

Do you have a schematics somewhere I can look at?

Jacques

"Jacques St-Pierre"

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.

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"

It is a quite straight forward task.

.......... Phil

"Jacques St-Pierre"

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?

"Nico Coesel"

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

Or just a keen amateur.

...... Phil

Someone wants to listen to whale sounds around 20Hz... If you convert the frequencies of the signal to an area around 500Hz, you'll be able to use any cheap speaker set to hear the sound and record it into a computer (which may have trouble with frequencies below 100Hz; depending on the quality of the soundcard).