AW: Quadra Phaser clone is working!

Haible Juergen Juergen.Haible at
Fri Jun 27 11:45:45 CEST 1997

	>Very cool!  A stereo pair of these in a rack mount unit would
be such
	>a wonderful machine.

Exactly my thoughts. The stereo output is impressive, but a little
exaggerated, and not at all mono compatible.
So the right way to do it is 2 separate ladders.

	>How noisy is it without the 4007 circuit?

I haven't checked yet. The most astounding thing for me was how
absolutely noise-*free* it is with this cheap little compander.
I think I have heard some popping with very fast transients, however.
The compander is quite on the fast side.

While I have to check the noise without compander, here's an idea:

I think that the SNR would be similar to any device that uses a single,
nonlinearized pn junction as VC resistor. So maybe we could use
several pn junctions in series for each stage (the HiFli trick):
What about connecting several diodes in series to each transistor's
base? The DC voltage over the ladder would be multiplied as well,
of course, but we could simply use a larger supply voltage ...

Have to check if it works.


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