A-F circuits

(BTW, I guess in ss it's not as much an issue because of the high impedences that are used. I'm mainly talking about tube audio amps where impedence matching is a bigger deal)

"Jon Slaughter"

Purest idiocy.

Is there any easy way to "shift" a steaming great F****IT like Slaughter from ever posting his asinine, verbal excreta on SED again ?

No kind of cruel, public humiliation is beyond consideration.

The worse, the better.

..... Phil

If you wern't such a nut case you might be usefull... How does your sneaky ass get through my filters!?!??!

, L >>

hod

eir

any

C?)

This is a very silly proposition - for once I agree with Phil Allison.

There is the germ of a good - if old - idea in there which was long ago embodied in class-D (switching) amplifiers.

Getting a suitable switching drive waveforn out of a digital audio system isn't all that difficult, though a really fast clock oscillator

- several hundred MHz - is required if you want 14-bit amplitude resolution on the 10kHz components and don't want to bother with programmable monstables.

A guitar amplifier based on the approach would have to digitise the signal coming in from the guitar, which is neither difficult nor expensive.

-- Bill Sloman, Nijmegen

"Jon Slaughter"

Purest idiocy.

Is there any easy way to "shift" a steaming great F****IT like Slaughter from ever posting his asinine, verbal excreta on SED again ?

No kind of cruel, public humiliation is beyond consideration.

The worse, the better.

..... Phil

This was done in the 70's, for a speech clipper/ limiter for "Ham use"

martin

I concur with Mr. Sloman

martin

It seems to basically use that idea but for clipping instead of filtering but looks like it should work. I'm just wondering how well it would work for hi fi?

He's Jon Slaughter.

That's punishment enough.

You are describing a single ended class A amplifier that works down to 1 Hz. I doubt that one ever was built. Where do you find a speaker that puts out 1 Hz?

Easy enough to shift audio frequencies up, but you lose the octave relationship. Taking your example of a 1 Hz HPF, if you shift all frequencies up by 1 MHz, then you would have to design a filter that has 3 db loss at 1.000001 MHz, and infinite loss at 1.000000 MHz. Such a filter can not be built. The converse is often done. That is frequencies are shifted DOWN to get a desired filter shape. Virtually every radio made since about 1935 does that; so does your TV.

Tam

This looks interesting though a bit pricey.

GG

Sure. But then only my dog could hear my stereo.

They are called shakers.

I just found a competing item:

On Nov 9, 5:05=A0pm, Ben Bradley wrote: > On Sun, 09 Nov 2008 18:54:13 -0500, Ben Bradley >

Cool - should bring the price down. How do you explain to the wife that your sub-woofer needs to be cleaned and lubed? It was bad enough when they need to be re-foamed.

GG

Hey, there is an idea for that "How to make money from electronics" thread. Plenty of Audiophools will lap it up. Phil did a frequency shifter project, start there and work your way up.

Watch this space for a Monster Cables matching "frequency shifter" black boxes. They'll catch on that there is a buck or two to had here.

Dave.